Abstract

The present application proposes a composite separator, including: a base membrane, a first nanofiber layer, and a ceramic powder. The first nanofiber layer is positioned on a first side of the base membrane. The ceramic powder forms a first ceramic coating positioned between the first nanofiber layer and the base membrane, or, the ceramic powder is added to the first nanofiber layer. In addition, the present application further proposes a method for preparing the composite separator, and a battery.

IPC Classes  ?

• H01M 50/457 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers
• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• H01M 50/42 - Acrylic resins
• H01M 50/429 - Natural polymers
• H01M 50/434 - Ceramics
• H01M 50/44 - Fibrous material
• H01M 50/443 - Particulate material
• H01M 50/446 - Composite material consisting of a mixture of organic and inorganic materials
• H01M 50/451 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic material
• H01M 50/454 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising a non-fibrous layer and a fibrous layer superimposed on one another
• H01M 50/489 - Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties

Abstract

Provided is a separator having a low pore closure temperature, comprising: a base membrane (1), which includes unbranched polyolefins and long-chain branched polyolefins; and a coating (2), which is formed on at least one surface of the base membrane (1) and includes: a heat-sensitive polymer material. By means of the above solution, the pore closure response time and the pore closure temperature of the separator can be greatly reduced, and consequently the safety of lithium ion batteries can be improved.

IPC Classes  ?

• H01M 50/446 - Composite material consisting of a mixture of organic and inorganic materials
• H01M 50/449 - Separators, membranes or diaphragms characterised by the material having a layered structure

Abstract

Provided is a battery separator having a high-heat-resistance ceramic coating, characterized in that said separator comprises a base film and a ceramic coating coated on the base film; the ceramic coating comprises a ceramic powder and a binder, and the binder bonds the ceramic powder onto the base film; the ceramic powder further comprises at least one inorganic substance A having a density of 5-15g/cm3. The beneficial effects of the present invention are: when the base film is coated with a layer of the ceramic coating containing at least one high-density inorganic substance A, because of the large gravity of the inorganic substance A, a "pillar" effect can be achieved in the three-dimensional structure of the separator, forming a more stable rigid structure; this allows for resistance to large surface area shrinkage resulting from stress release that is caused by molecular chain movement in the separator in a high-temperature environment.

IPC Classes  ?

• H01M 50/434 - Ceramics

Abstract

Provided is a battery separator, which is characterized in that said separator comprises: at least one base membrane; at least one inorganic layer positioned on the base membrane; and a plurality of polymer particles, the plurality of polymer particles being positioned on the inorganic layer, and the density of the polymer particles being less than the density of the inorganic layer. In the present invention, barium titanate and polymer particles having a multilayer structure are blended, the base membrane is coated with the blended slurry, the base membrane is dried in an oven. During drying, a difference in density is present between the barium titanate and the polymer particles, causing the barium titanate having a larger density to sink and the polymer particles to rise, and consequently the prepared battery separator has excellent heat resistance properties while possessing high adhesion.

IPC Classes  ?

• H01M 50/449 - Separators, membranes or diaphragms characterised by the material having a layered structure

Abstract

An ultra-high molecular weight polyolefin separator, wherein the polyolefin separator comprises an ultra-high molecular weight polyethylene, the average molecular weight of the ultra-high molecular weight polyethylene being greater than or equal to 1 million; and the median pore size of the ultra-high molecular weight polyolefin separator is 0.04 μm-1 μm, the maximum pore size does not exceed 1.2 μm, and the puncture strength is greater than or equal to 50 gf. Further provided is a preparation method for the ultra-high molecular weight polyolefin separator. Since the safety of the polyolefin separator is higher than that of an ordinary non-woven fabric separator, and the polyolefin separator has a relatively high ionic conductivity and a relatively large median pore size, the problem of the risk of an ordinary non-woven fabric separator for a lithium battery being very high, despite a high lithium ion passing rate, which makes same prone to causing a short circuit of a battery, is solved.

IPC Classes  ?

• H01M 50/417 - Polyolefins
• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
• H01M 50/491 - Porosity

Abstract

The present invention relates to the technical field of lithium batteries, and in particular, to an electrolyte composite separator, a preparation method, and a lithium battery. The electrolyte composite separator comprises a base film, a solid electrolyte layer disposed on at least one side of the base film, and a resin layer disposed on at least the side of the solid electrolyte layer away from the base film. The peel strength between the solid electrolyte layer and the base film is greater than the peel strength between the solid electrolyte layer and the resin layer. When a lithium battery is prepared by using the electrolyte composite separator provided in the examples of the present application, due to the fact that the peel strength between the resin layer and a solid electrolyte is relatively small, the resin layer can be partially integrated into the electrode material after hot pressing, so that the solid electrolyte layer can be in full contact with the electrode material, resin content in the contact interface between the solid electrolyte layer and the electrode material is reduced, and the internal resistance of the lithium battery can be reduced.

IPC Classes  ?

• H01M 50/457 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers

Abstract

(2)(1)(2)(1)(1)>1.0. By using the separator (31), the cycling performance of the battery can be improved, and the cycle life of the battery can be extended.

IPC Classes  ?

• H01M 50/457 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers
• H01M 50/449 - Separators, membranes or diaphragms characterised by the material having a layered structure
• H01M 50/491 - Porosity

Abstract

A composite separator, a preparation method therefor, and a battery. The composite separator comprises: a base film, a first nanofiber layer, and a ceramic powder; wherein the first nanofiber layer is located on a first side of the base film; the ceramic powder forms a first ceramic coating layer located between the first nanofiber layer and the base film, or the ceramic powder is added to the first nanofiber layer.

IPC Classes  ?

• H01M 50/40 - SeparatorsMembranesDiaphragmsSpacing elements inside cells
• H01M 50/44 - Fibrous material

Abstract

A battery separator. The battery separator comprises: a porous base material and a bonding layer, which is formed on one side of the porous base material, wherein the bonding layer comprises a polymer material having bonding performance, and has a coating coefficient C. The coating coefficient C is equal to the ratio of the bonding strength A of the bonding layer to an air permeability increase value P of the unit coating thickness and satisfies the relational expression C=A/P, wherein the ratio range of the coating coefficient C is 0.3

IPC Classes  ?

• H01M 50/449 - Separators, membranes or diaphragms characterised by the material having a layered structure
• H01M 50/491 - Porosity
• H01M 50/414 - Synthetic resins, e.g. .thermoplastics or thermosetting resins
• H01M 50/426 - Fluorocarbon polymers

Abstract

Provided in the present invention is a multi-element co-doped sodium-ion positive electrode material, which is characterized in that the phase of the positive electrode material is an O3 phase, the space group thereof is R-3m, and the chemical formula thereof is NaαMaLibCucTidO2+β, wherein M is at least one of Ni, Co, Mn, Cr, V, Al, Fe, B, Si, Mg and Zn, 0.5≤α≤1, −0.1≤β≤0.1, 0

IPC Classes  ?

• C01G 45/12 - Complex oxides containing manganese and at least one other metal element
• H01M 10/054 - Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium

Abstract

abcde2+f2+f, wherein M is at least one of Co, Cr, V, Al, Fe, Sn, B, Cu, Ti, Mg, and Zn, 0.9≤a<1, 0

IPC Classes  ?

• H01M 10/054 - Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium

Abstract

A battery separator comprises a base membrane and a porous aramid coating bonded to at least one surface of the base membrane. The aramid coating comprises a high-density region and a low-density region which are bonded to the base membrane, and the high-density region and the low-density region are intermingled and connected. The density of the high-density region is greater than that of the low-density region, the low-density region protrudes with respect to the high-density region, and the high-density region is formed as recesses in the aramid coating. Also provided are a preparation method for the battery separator, a battery comprising the battery separator, and an electronic device. The high-density region plays a supporting role as a skeleton structure of the aramid coating, ensuring the rupture temperature and heat shrinkage performance of the separator, and the low-density region can alleviate the adverse effects of the addition of the coating on ionic conductivity. Forming the high-density region as recesses in the aramid coating also provides better circulation and liquid retention channels for an electrolyte, thereby improving the electrolyte absorption rate of a cell, and reducing the difficulty of liquid injection during cell production.

IPC Classes  ?

• H01M 50/446 - Composite material consisting of a mixture of organic and inorganic materials
• H01M 10/052 - Li-accumulators
• H01M 50/451 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic material

Abstract

The present disclosure relates to the field of lithium battery separators, and aims to provide a battery separator and a coating process thereof, a coating system and a battery. The coating process includes: initial heat setting of a polyolefin membrane, online coating of the polyolefin membrane, and heat setting of a coating membrane. The coating system includes a plurality of drying ovens disposed in a travel route of heat setting of a polyolefin membrane, and a coating apparatus for coating a coating slurry on the polyolefin membrane, which is disposed at a spacing position of adjacent drying ovens. When the online coating flow is disposed before the end of the heat setting of the polyolefin membrane, the polyolefin base membrane and the coating slurry are dried by using the temperature of the heat setting drying oven of the polyolefin membrane.

IPC Classes  ?

• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• H01M 50/417 - Polyolefins
• H01M 50/434 - Ceramics

Abstract

An ultrahigh strength separator and the preparation method thereof. The method comprises: (1) mixing and heating a composition comprising a polyolefin resin, an antioxidant, and a pore-forming agent to form a molten state mixture, extruding the mixture through a die, and cooling it to form casting piece; (2) performing a first machine direction stretching and a first transverse direction stretching on the casting piece sequentially to obtain a stretched film; (3) performing a second machine direction stretching on the stretched film; (4) performing a second transverse direction stretching; (5) performing extraction, a third transverse stretching, and heat setting sequentially to obtain the ultrahigh strength separator. The separator prepared by the process of the present disclosure is greatly improved in tensile strength in the machine and transverse stretching directions, and its puncture strength can also be much higher than that of other separators of the same thickness. When the separator disclosed herein is used in a lithium-ion battery, it can provide better isolation and protection for the positive and negative electrodes of the battery when the battery is subjected to external shocks, so as to avoid the risk of short circuit caused by separator rupture, and can improve the safety performance of lithium-ion batteries.

IPC Classes  ?

• H01M 50/489 - Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties

Abstract

The present disclosure relates to the technical field of lithium-ion battery separators, and provides a method for preparation of a lithium-ion battery separator. The method comprises: (1) mixing and heating a composition comprising a polyolefin resin, an antioxidant, and a pore-forming agent to a molten state mixture, extruding the mixture through a die, and then cooling it to form a casting piece; (2) performing a first machine direction stretching and a first transverse direction stretching on the casting piece sequenctially to obtain a stretched film; (3) performing a second machine direction stretching on the stretched film; (4) performing a second transverse direction stretching; (5) extracting the pore-forming agent in the separator to obtain a separator after extraction; (6) performing a third machine direction stretching on the separator after extraction; (7) performing a third transverse direction stretching; (8) performing a fourth transverse stretching and heat setting sequenctially to obtain the lithium-ion battery separator. The separator prepared by the process of the present disclosure is greatly improved in tensile strength in the machine and transverse directions, and its puncture strength can also be much higher than that of other separators of the same thickness.

IPC Classes  ?

• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• H01M 50/417 - Polyolefins
• H01M 50/494 - Tensile strength
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries

Abstract

Provided in the present application are a separator and a preparation method therefor, a secondary battery, and an electric device. The separator comprises a base film and an aramid coating coated on at least one side surface of the base film, wherein the aramid coating has a porous structure, the pore diameter of a surface pore of the aramid coating is a first pore diameter, the pore diameter D50 of an inner pore of the aramid coating is a second pore diameter, the first pore diameter D50 is 0.8 to 1.5 times the second pore diameter D50, and the first pore diameter and the second pore diameter are both less than 1 μm. The thermal shrinkage rate of the separator at 150ºC is controlled within 10%, and the breaking temperature of the separator is above 200ºC.

IPC Classes  ?

• H01M 50/491 - Porosity
• H01M 50/489 - Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
• H01M 50/40 - SeparatorsMembranesDiaphragmsSpacing elements inside cells

Abstract

A composite ion exchange membrane, comprising a porous base membrane layer (11) and a graft polymerization resin layer (12). A preparation method for the composite ion exchange membrane comprises: subjecting a polymer monomer and polyvinylidene fluoride to a graft polymerization reaction to form a graft polymer; preparing the graft polymer into a dispersion liquid; spraying same onto the porous base membrane layer to obtain a composite thin membrane; and subjecting the composite thin membrane to a protonation treatment using an acid solution or an alkali solution to obtain the composite ion exchange membrane. By means of the method, a composite ion exchange membrane with high ionic conductivity and high stability can be prepared.

IPC Classes  ?

• H01M 8/02 - Fuel cellsManufacture thereof Details
• H01M 8/1041 - Polymer electrolyte composites, mixtures or blends

Abstract

The present disclosure relates to the field of battery separators, and in particular discloses a polyolefin microporous membrane with a thickness of 2 to 30 μm, a puncture strength of 1000 to 2000 gf, a tensile strength of 3200 to 5000 kgf/cm2 along an MD direction, a tensile strength of 2800 to 4800 kgf/cm2 along a TD direction, a porosity of 40% to 57%, a maximum pore size of 33 to 48 nm, an air permeability of 10 to 400 s/100 ml, and an impedance of 0.3 to 0.952/cm2, and a manufacturing system thereof, and a coated separator and an electrochemical apparatus using the basal membrane. In the present disclosure, the polyolefin microporous membrane has excellent performance and its thickness, tensile strength, puncture strength, air permeability, porosity and thermal shrinkage rate all can satisfy the applications having high requirements for the thickness and mechanical strength of the microporous membranes.

IPC Classes  ?

• H01M 50/417 - Polyolefins
• H01M 50/491 - Porosity
• H01M 50/494 - Tensile strength
• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• H01M 50/451 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic material

Abstract

A metal compound separator, comprising a base film and a coating formed on at least one side of the base film, wherein the coating comprises at least heat-resistant particles and metal oxide particles. A preparation method for the metal compound separator comprises the following steps: mixing heat-resistant particles, metal oxide particles and a solvent to obtain a dispersion liquid; and coating at least one side of the base film with the dispersion liquid, and performing drying to obtain the metal compound separator. A lithium battery, comprising the described metal compound separator, a positive electrode and a negative electrode, wherein the metal compound separator is located between the positive electrode and the negative electrode.

IPC Classes  ?

• H01M 50/431 - Inorganic material
• H01M 10/052 - Li-accumulators
• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms

Abstract

αabcd2+β2+β, wherein M is at least one of Ni, Co, Mn, Cr, V, Al, Fe, B, Si, Mg and Zn, 0.5≤α≤1, -0.1≤β≤0.1, 0

IPC Classes  ?

• H01M 4/485 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy

Abstract

This separator for a nonaqueous secondary battery has a porous substrate and an adhesive layer on at least one surface of the porous substrate, said adhesive layer including a polyvinylidene fluoride resin, and includes a nonionic surfactant with a clouding point between 30°C and 85°C, inclusive, and a molecular weight between 200 and 1500, inclusive.

IPC Classes  ?

• H01M 50/449 - Separators, membranes or diaphragms characterised by the material having a layered structure
• H01M 50/417 - Polyolefins
• H01M 50/426 - Fluorocarbon polymers
• H01M 50/434 - Ceramics
• H01M 50/443 - Particulate material
• H01M 50/451 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic material
• H01M 50/457 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers

Abstract

This separator for a nonaqueous secondary battery: has a porous base material and an adhesion layer containing a polyvinylidene fluoride resin on at least one surface of the porous base material; and contains a lithium imide salt.

IPC Classes  ?

• H01M 50/449 - Separators, membranes or diaphragms characterised by the material having a layered structure
• H01M 50/417 - Polyolefins
• H01M 50/426 - Fluorocarbon polymers
• H01M 50/434 - Ceramics
• H01M 50/443 - Particulate material
• H01M 50/451 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic material
• H01M 50/457 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers

Abstract

A porous fiber composite separator, comprising: a structural fiber, formed by spinning of a structural resin; and a functional fiber, formed by spinning of a functional resin, and cross-linked and wound with the functional fiber. The functional fiber has a carbonyl or cyano functional group. The structural resin comprises any one or more of polymethyl methacrylate, polystyrene, polyvinylidene fluoride, polytetrafluoroethylene, polyethylene terephthalate, polyurethane, and polyester.

IPC Classes  ?

• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• H01M 50/409 - Separators, membranes or diaphragms characterised by the material

Abstract

A flexible current collector core layer (1) and a preparation method therefor, a current collector (2) and a preparation method therefor, an electrode sheet (3), and a battery (4). The flexible current collector core layer (1) comprises an insulating support layer (11) and a porous conductive layer (12). The porous conductive layer (12) is provided on two sides of the insulating support layer (11); the material of the insulating support layer (11) comprises a first polyolefin material or/and a flame-retardant polyolefin material; the melting point of the polyolefin material in the first polyolefin material and the flame-retardant polyolefin material is not greater than 136°C; the material of the porous conductive layer (12) comprises a second polyolefin material and a conductive filler. The flexible current collector core layer (1) can be obtained by means of mixing, melt extrusion, casting and stretching processes of the material of the insulating support layer (11) and the material of the porous conductive layer (12), and the stretching temperature is 90°C-140°C in the stretching process.

IPC Classes  ?

• H01M 4/66 - Selection of materials
• H01M 4/64 - Carriers or collectors

Abstract

22 can be weakened, and the diffusion speed of Li+ can be increased by means of an effective infiltration avenue; additionally, the porous carbon matrix having a larger surface area can produce more active sites, thereby allowing an electrolyte to effectively permeate into an electrode material, improving electrical conductivity, and causing a formed battery to have better performance.

IPC Classes  ?

• H01M 4/80 - Porous plates, e.g. sintered carriers
• H01M 4/66 - Selection of materials
• H01M 10/052 - Li-accumulators

Abstract

A battery (B) containing magnetic current collectors (1, 2) and a preparation method therefor. By applying external magnetic fields (M1, M2) to polymer matrices (11, 21), magnetic material layers (12, 22) can be compounded, according to magnetic induction line directions of the external magnetic fields (M1, M2), on the polymer matrices (11, 21), and finally conductive material layers (13, 23) are compounded additionally on the magnetic material layers (12, 22), such that magnetic current collectors (1, 2) are produced, and the magnetic current collectors (1, 2) with opposite magnetic properties are assembled into a battery. A stable magnetic field is formed between the magnetic current collectors in the battery, such that the migration of lithium ions becomes regular under a constraint of the magnetic field. In addition, in terms of passing through a lithium battery diaphragm, the regular movement of the lithium ions improves the permeation efficiency of the diaphragm, and can reduce the impedance of the diaphragm.

IPC Classes  ?

• H01M 4/66 - Selection of materials
• H01M 10/05 - Accumulators with non-aqueous electrolyte
• H01M 10/058 - Construction or manufacture

Abstract

The present invention provides a lithium battery diaphragm, and relates in particular to a coated diaphragm. The coated diaphragm at least comprises a base film and a coating layer that is coated on at least one side of the base film. The coating layer at least comprises porous PMMA microspheres, ceramic particles, a thickener, an aqueous adhesive, and a wetting agent. The porous PMMA microspheres have a particle size D50 of 1.0-4.0 μm, a porosity of 10%-40%, and an average pore size of 30 nm-150 nm. Not only can the coating layer improve the thermal shrinkage performance of the diaphragm, but the porous PMMA microspheres in the coating layer can also provide better circulation and fluid retention channels for an electrolyte solution, thereby improving the electrolyte solution wettability of the diaphragm, and rapid liquid injection can be achieved. In addition, adverse effects of a polymer coating layer on air permeability can be reduced, thereby improving the ionic conductivity thereof and improving the rate performance and the cycle performance of a cell. Moreover, the coating layer can increase the adhesion performance of the diaphragm and a pole piece, thereby reducing the risk of deformation of the cell and improving the safety performance of the cell.

IPC Classes  ?

• H01M 50/40 - SeparatorsMembranesDiaphragmsSpacing elements inside cells
• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• H01M 50/449 - Separators, membranes or diaphragms characterised by the material having a layered structure

Abstract

Provided is an inorganic/organic composite separator, which comprises a base membrane (1), an inorganic layer (2) and an organic solid electrolyte (3), wherein the inorganic layer (2) is formed on the base membrane (1) and comprises internal pores; the organic solid electrolyte (3) is filled in the internal pores of the inorganic layer (2) and distributed on the surface of the inorganic layer (2); and the organic solid electrolyte (3) comprises an organic polymer, the organic polymer being formed by means of an in-situ polymerization reaction in the internal pores of the inorganic layer (2) and on the surface of the inorganic layer (2).

IPC Classes  ?

• H01M 50/446 - Composite material consisting of a mixture of organic and inorganic materials
• H01M 50/457 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers
• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms

Abstract

The present invention relates to the field of batteries. Specifically disclosed is a composite current collector, comprising an insulating layer and a conductive layer, wherein the insulating layer is used for bearing the conductive layer; the conductive layer is used for bearing an electrode active material, and the conductive layer is located on at least one surface of the insulating layer; and the surface of the insulating layer is rough and comprises burrs. According to the composite current collector manufactured in a reactive ion etching (RIE) mode, laser drilling is not needed, so that the cost can be reduced, the reliability is improved, and the service life is prolonged; moreover, in a temperature rise stage caused by overshoot and short circuit, the composite current collector causes the insulating layer to be fused or expanded, and the conductive layer becomes discontinuous, so that the resistance is rapidly increased, the current is rapidly reduced, and the generation of joule heat is inhibited, thereby being capable of effectively reducing the local temperature bulge caused by the short circuit in a battery, and reducing the risks of ignition and explosion of a lithium ion battery.

IPC Classes  ?

• H01M 4/64 - Carriers or collectors
• H01M 4/66 - Selection of materials
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries

Abstract

Disclosed in the present invention is an isolating membrane of an electrochemical device, comprising a modified porous base membrane and a functional layer arranged on the surface of at least one side of the modified porous base membrane. The functional layer contains slurry of organic matter and inorganic matter compounds, and the modified porous base membrane contains particles of a lithium-containing conductive ion compound. According to the present invention, the lithium-containing conductive ion compound is prepared by adopting a sol-gel-hydrothermal method, and small-particle-size particles of the lithium-containing conductive ion compound are embedded into the isolating membrane base membrane, so that the defects of poor ionic conductivity and poor wettability of an existing isolating membrane are overcome, and moreover, the isolating membrane has good adhesion and heat resistance due to the coated functional layer.

IPC Classes  ?

• H01M 50/446 - Composite material consisting of a mixture of organic and inorganic materials
• H01M 50/449 - Separators, membranes or diaphragms characterised by the material having a layered structure
• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms

Abstract

An outer packaging material for a battery apparatus, the material comprising a base layer (1), a bonding layer (2), a barrier layer (5), another bonding layer (7), and a hot-melt adhesive layer (8); the bonding layer (2) is disposed between the base layer (1) and the barrier layer (5); the other bonding layer (7) is disposed between the barrier layer (5) and the hot-melt adhesive layer (8); the barrier layer (5) is composed of a single layer or multiple layers of aluminum alloy foil; the aluminum alloy foil composition and the mass percentage thereof comprises over 1.2% Fe content and over 1% Mg content; after undergoing annealing treatment, a large amount of Mg will precipitate out from within the aluminum foil, and the ratio of the precipitated Mg amount to a precipitated Al amount is between 2-4.

IPC Classes  ?

• H01M 50/129 - Primary casingsJackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only organic material
• H01M 50/119 - Metals
• H01M 50/121 - Organic material
• H01M 50/133 - Thickness
• H01M 50/105 - Pouches or flexible bags
• B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties
• B32B 15/20 - Layered products essentially comprising metal comprising aluminium or copper
• B32B 15/085 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin comprising polyolefins
• B32B 27/32 - Layered products essentially comprising synthetic resin comprising polyolefins

Abstract

Disclosed in the present invention are a heat-conducting lithium ion separator and a preparation method therefor. The heat-conducting lithium ion separator comprises a wet-process base membrane and a coating. The coating provided in the present invention comprises ceramic particles and aluminum nitride inorganic particles, which are mixed and bonded by means of an organic binder. Compared with a single aluminum oxide or boehmite ceramic coating, the introduction of aluminum nitride particles on this basis greatly improves the heat conduction performance of the lithium ion separator; the heat-conducting property and the comprehensive performance of the separator can be improved by means of controlling the amount of aluminum nitride; and the heat-conducting property of the finally prepared heat-conducting separator, and the safety performance and other electrochemical properties of a battery are effectively improved.

IPC Classes  ?

• H01M 50/40 - SeparatorsMembranesDiaphragmsSpacing elements inside cells
• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• H01M 50/449 - Separators, membranes or diaphragms characterised by the material having a layered structure
• H01M 50/431 - Inorganic material

Abstract

The present invention relates to the technical field of lithium battery separators, and specifically disclosed is a method for preparing a microporous membrane with a high pore uniformity. The method comprises the following steps: (1) mixing and heating a polyolefin and a pore-forming agent to a molten state; (2) allowing the mixture to pass through a die head and be cooled to form a sheet; (3) allowing the sheet to pass through an oil removal roller to suck out the pore-forming agent inside the sheet; (4) heating and stretching the sheet in at least one axial direction; (5) stretching the sheet again for shaping in at least one axial direction; and (6) rolling to obtain the microporous membrane with a high pore uniformity. In step (3), the oil removal roller is provided with microporous flow channels in the surface thereof, and is provided with a hollow pipe and a heating coil at the center thereof; the hollow pipe is connected to the microporous flow channels in the roller surface, and is externally connected to a vacuum-pumping machine; and the heating coil is connected to an external heat exchange station. The separator prepared by the method has the characteristics of a low porosity, an extremely high pore uniformity, a low surface resistance rate, and an extremely high D value (D = nail penetration strength/thickness).

IPC Classes  ?

• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• H01M 50/491 - Porosity

Abstract

A polymer ion-conducting functional resin and a preparation method therefor. The polymer ion-conducting functional resin has a core-shell structure which comprises a core, and a shell wrapped on the outer surface of the core, wherein the crystallinity of the core is greater than that of the outer shell by 20% or more. One surface or two surfaces of a porous substrate are coated with slurry prepared from the polymer ion-conducting functional resin to prepare a lithium battery separator, and a gap between the core and the shell can provide channels for an organic solvent and a small molecule compound, so that the separator has a higher liquid absorption rate; due to the low crystallinity of the shell structure, the separator can be attached to a pole piece at a low hot-pressing temperature, thereby guaranteeing rapid passing of lithium ions in the charging and discharging processes; in addition, due to the high crystallinity of the core structure of the polymer ion-conducting functional resin, a coating layer is not easily deformed under the action of an external force, so as to maintain the structural integrity.

IPC Classes  ?

• H01M 50/449 - Separators, membranes or diaphragms characterised by the material having a layered structure
• H01M 50/491 - Porosity
• H01M 50/414 - Synthetic resins, e.g. .thermoplastics or thermosetting resins

Abstract

The present invention relates to a separator film in a lithium battery, more specifically relates to a polyolefin microporous film and a preparation method thereof. The polyolefin microporous film has a porosity above 30% and below 65%, a median pore size above 10 nm and below 60 nm, a stress-strain (σ-ε) curve integral in Machine Direction (MD) and Transverse Direction (TD) directions simultaneously fulfilling the following definition: The present invention relates to a separator film in a lithium battery, more specifically relates to a polyolefin microporous film and a preparation method thereof. The polyolefin microporous film has a porosity above 30% and below 65%, a median pore size above 10 nm and below 60 nm, a stress-strain (σ-ε) curve integral in Machine Direction (MD) and Transverse Direction (TD) directions simultaneously fulfilling the following definition: E=∫0εσ(ε)dε>150 J/m2; and the largest pore size, the smallest pore size and the median pore size fulfilling the following definition: 0.9

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets
• C08J 9/00 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof
• C08J 9/26 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
• C08L 23/06 - Polyethene

Abstract

The present invention relates to the field of energy storage devices, and specifically to a battery separator for an energy storage device, a preparation process thereof, a preparation system therefor, and an energy storage device. The battery separator for an energy storage device comprises a positive electrode layer and an intermediate separator in sequence. The battery separator effectively improves the production efficiency of the energy storage device, and obtains a high energy density and high safety energy storage device on the basis of the innovation of the structure of the battery separator and the in-line coating technology while greatly reducing the production cost.

IPC Classes  ?

• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• H01M 50/491 - Porosity
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries

Abstract

The present disclosure relates to the field of solid-state electrolyte membranes, and in particular to, a simultaneous-type preparation method for a substrate-supported solid-state composite electrolyte membrane, comprising the following steps: a, extruding slurry of molten polyolefin having an ultra-high molecular weight or high density to form a cast membrane; b, uniformly extruding slurry of molten solid-state electrolyte on the surface of the cast membrane at the temperature T1 to form a solid-state electrolyte coating, thereby obtaining a solid-state electrolyte coating-cast substrate; c, stretching the solid-state electrolyte coating-cast substrate at the temperature T2 to obtain a membrane; and d, subjecting the stretched membrane to hot-pressing shaping to control the thickness, and cooling to obtain a solid-state composite electrolyte membrane. The immersion effect of the solid-state electrolyte on a porous carrier is adjusted by controlling a stretching parameter to form a continuous lithium conduction channel, to improve the lithium conduction ability of the composite electrolyte, and eliminate the subsequent separate immersion step at the same time, thereby effectively improving the production efficiency of the composite electrolyte membrane.

IPC Classes  ?

• H01M 10/0565 - Polymeric materials, e.g. gel-type or solid-type
• H01M 10/058 - Construction or manufacture

Abstract

The present disclosure relates to the field of solid-state electrolytes, and in particular to a high-strength solid-state electrolyte membrane in which a polyolefin membrane is used as a main body and a continuous lithium conducting channel is embedded in the main body. According to the high-strength solid-state electrolyte membrane provided by the present disclosure, polyolefin is used as a main body framework, and a lithium conducting material is dispersed in dimensional spaces of the main body to form a continuous lithium conducting channel, so that the conduction of lithium ions is implemented without using an electrolyte, thus implementing high strength and good processing performance. The thickness of the solid-state electrolyte membrane can be controlled by means of stretching, thus facilitating preparing a composite electrolyte membrane having a corresponding thickness and strength according to actual requirements.

IPC Classes  ?

• H01M 10/0565 - Polymeric materials, e.g. gel-type or solid-type

Abstract

A separator winding device comprising a winding tube core (2) and a heat-shrinkable sleeve (1), which separator winding device relates to the field of lithium battery separators. The inner side of the winding tube core (2) is of a circular ring shape, and the outer side thereof is provided with equal-height protrusions; and the heat-shrinkable sleeve (1) is sleeved on the winding tube core (2). The heat-shrinkable sleeve (1) is subjected to heat shrinking at 65ºC-90ºC, so that the outer diameter of the heat-shrinkable sleeve (1) is reduced by 4 mm-10 mm. After a separator is wound around the separator winding device, the separator is heated at 65ºC-90ºC, and is left for 12 h-36 h at 25ºC-45ºC so as to be subjected to aging placement, and then the separator that has been subjected to aging placement is wound. The material of the heat-shrinkable sleeve (1) is in a glassy state at room temperature and changes to a high-elastic state after being heated. In the process of realizing a heat shrinking treatment, the heat-shrinkable sleeve (1) shrinks inwards, and the outer diameter of the heat-shrinkable sleeve (1) is reduced. By means of the present device, the situations of separator deformation and edge collapse during an internal stress release process of separators that are caused by the fact that the separators press one another and the separators press a winding core due to shrinkage can be greatly alleviated, and the adverse phenomena of rib forming and wrinkling caused by the uneven release of internal stress of the separators are prevented.

IPC Classes  ?

• B65H 75/08 - Kinds or types of circular or polygonal cross-section
• B65H 75/18 - Constructional details
• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms

Abstract

The present invention relates to the field of battery separators. Specifically, disclosed is a polyolefin microporous membrane of which the membrane thickness is 2-30 μm, the puncture strength is 1000-2000 gf, the tensile strength in direction MD is 3200-5000 kgf/cm2, the tensile strength in direction TD is 2800-4800 kgf/cm2, the porosity is 40% to 57%, the maximum pore diameter is 33-48 nm, the gas permeation rate is 10-400 s/100 mL, the impedance is 0.3-0.9 Ω/cm2, a manufacturing system therefor, a coated separator using the base membrane, and an electrochemical apparatus. The polyolefin microporous membrane of the present invention is provided with excellent properties and, with the thickness, tensile strength, puncture strength, air permeability, porosity, and thermal shrinkage thereof satisfying applications having high requirements on the thickness and mechanical strength of the microporous membrane, is very suitable for use in the field of power lithium-ion battery separators.

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets
• C08L 23/06 - Polyethene
• C08J 9/26 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• H01M 50/417 - Polyolefins

Abstract

The present invention relates to the field of battery diaphragms. Disclosed is a preparation method for a polyolefin microporous diaphragm. The preparation method comprises: making a cast sheet pass through a boiling-type pore-forming agent removal unit to remove a pore-forming agent; stretching, at least in one axial direction, the sheet from which the pore-forming agent has been removed, so as to obtain a base membrane; and then carrying out stretching and heat-setting on the base membrane to obtain a polyolefin microporous diaphragm. The temperature of the pore-forming agent/a pore-forming agent removal liquid is increased, and the viscosity and the surface tension thereof are reduced, so that the pore-forming agent/pore-forming agent removal liquid can more easily enter and exit and more quickly pass through micropores, and the pore-forming agent removal efficiency is thus improved; therefore, when the sheet is subjected to MD/SBS stretching, the friction force between the sheet and an apparatus is increased without the need to reform the apparatus, thereby avoiding slipping between the sheet and the apparatus due to insufficient friction force, reducing the phenomenon whereby micropore closing/pore mis-location occurs in the sheet due to slipping, effectively ensuring a straight-through property of the micropores, and reducing impedance; and a higher molecular weight/solid content/stretching ratio can be used, so that the mechanical property of a final product diaphragm is greatly improved.

IPC Classes  ?

• C08J 9/26 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
• C08J 5/18 - Manufacture of films or sheets
• C08L 23/06 - Polyethene
• H01M 50/417 - Polyolefins
• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries

Abstract

A reeling apparatus for a lithium-ion battery separator, comprising a control processing unit (10), a cylindrical frame formed by joining at least two reeling components (20), and a travel control unit (40) used for driving the reeling components (20) to move back and forth in the radial direction of the cylindrical frame. The reeling components (20) are used for being joined to form the surface layer of the cylindrical frame and provided therein with a pressure sensor. The control processing unit (10) is electrically connected to the travel control unit (40) and to the pressure sensor. With such provision, the pressure experienced by the separator is precisely controlled during the advancing or retracting of a reeling process, the problem of unbalanced internal stress release due to an unbalanced pressure is solved, and the undesirable phenomena of the separator collapsing, deforming, ribbing, and wrinkling are prevented.

IPC Classes  ?

• B65H 75/24 - Constructional details adjustable in configuration, e.g. expansible

Abstract

The present invention relates to the field of lithium battery separators, and the purpose of the present invention is to provide a battery separator and a coating process and coating system therefor, and a battery. The coating process comprises: carrying out preliminary heat setting of a polyolefin film, on-line coating of the polyolefin film and heat setting of a coated film. The coating system comprises a plurality of ovens arranged in a travel path of the heat setting of a polyolefin film, and a coating device for coating the polyolefin film with a coating slurry arranged in spacing between adjacent ovens. The on-line coating process is arranged at the stage before the end of the heat setting of the polyolefin film, the polyolefin-based film and the coating slurry are dried by fully utilizing a polyolefin film heat setting oven temperature, and the coating is in close contact with the polyolefin-based film, such that the heat resistance of the coated film is effectively improved, and the water content of the coated film is reduced. Compared with an existing process flow, the process is simplified, and the slitting pass rate is also significantly improved.

IPC Classes  ?

• H01M 8/0271 - Sealing or supporting means around electrodes, matrices or membranes

Abstract

A non-woven fabric ceramic separator, comprising a non-woven fabric, and a ceramic slurry prepared from ceramic particles, water, a dispersing agent, a wetting agent, a thickening agent and an adhesive. The non-woven fabric ceramic separator is prepared by applying the ceramic slurry onto the surface of the non-woven fabric, and then filling the ceramic slurry into pores of the non-woven fabric by means of cold pressing. By adding the cold pressing procedure after coating to fill ceramic particles into the pores of the non-woven fabric so as to prepare a lithium battery separator, the thermal shrinkage performance of the non-woven fabric ceramic separator is improved while air permeability is ensured, and the mechanical strength of the non-woven fabric ceramic separator is greatly improved. The problem of existing non-woven fabric separators having excessively low mechanical strength during use and being thereby easily damaged under the action of an external force and lithium dendrites, such that a positive electrode and a negative electrode of a lithium ion battery come into contact and cause a short circuit, thus initiating a series of safety accidents, such as an explosion and combustion, is solved.

IPC Classes  ?

• H01M 50/434 - Ceramics
• H01M 50/44 - Fibrous material
• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries

Abstract

Specifically disclosed is a method for improving the distribution of the transverse thickness of a cast diaphragm sheet and saving a material at a die head, which relates to the technical field of battery diaphragms. The method comprises the steps as follows: a first fluid extruded by a primary extruder and a second fluid extruded by a secondary extruder entering respective runners through a distributor of a die head apparatus and finally merging and flowing out of a die lip; after casing and MD/TD stretching, performing one-time edge cutting, material cutting and backflow on the secondary extruder, and then extruding the second fluid again into its respective runner through the distributor of the die head apparatus; and after extraction, heat setting and winding, obtaining a diaphragm product with uniform distribution of the transverse thickness. The problems of the thickness uniformity of finished diaphragms, the waste of raw materials and environmental pollution in the prior art are thus solved.

IPC Classes  ?

• B29C 48/08 - Flat, e.g. panels flexible, e.g. films
• B29C 48/305 - Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
• B29C 48/275 - Recovery or reuse of energy or materials
• B29C 48/285 - Feeding the extrusion material to the extruder
• B29C 69/00 - Combinations of shaping techniques not provided for in a single one of main groups , e.g. associations of moulding and joining techniquesApparatus therefor
• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• B29K 23/00 - Use of polyalkenes as moulding material

Abstract

The present invention relates to the technical field of battery separators. Specifically disclosed is a method for preparing a polyolefin separator raw material. The method comprises firstly adding a pore-forming agent into a stirring kettle for preheating, dissolving an antioxidant into an excess of the pore-forming agent while heating and stirring, then separating undissolved solids and the liquid by means of a separator, adding the separated liquid and polyethylene into a melting equipment, and melting, plasticizing and mixing same to obtain a polyolefin separator raw material. According to the present invention, the antioxidant is dissolved by using an excess of the pore-forming agent, and the liquid separated by means of the separator is melted with PE, so that the compatibility of the two is improved, which ensures a smooth torque of the melt; and the addition mass fraction of the antioxidant is increased, the antioxidant is more uniformly dispersed in the system, and the antioxidant is sufficiently dissolved. The problems of a blockage occurring during discharging and the pore-forming agent yellowing are solved, and it can be ensured that the pore-forming agent, when recycled, can be reused, and thus the cost for re-treating or directly discarding the recycled pore-forming agent is greatly reduced. A prepared PE lithium battery separator is more stable in performances.

IPC Classes  ?

• B01F 1/00 - Dissolving
• B01F 3/22 - Aftertreatment of the mixture
• B01F 7/18 - Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a vertical axis with paddles or arms
• B01F 15/02 - Feed or discharge mechanisms
• B01F 15/06 - Heating or cooling systems

Abstract

The present invention relates to the field of lithium battery separators, and specifically to a polyolefin micro-porous membrane and a preparation method therefor. The porosity of the polyolefin micro-porous membrane is greater than or equal to 30% and is less than or equal to 65%; a median pore diameter is greater than or equal to 10 nm and is less than or equal to 60 nm; stress-strain (σ-ε) curve integrals in MD and TD directions both meet the relationship of formula (I); and the maximum pore diameter, the minimum pore diameter and the median pore diameter meet the following relationship: 0.9 < P < 1.2, where P = (the maximum pore diameter - the minimum pore diameter)/the median pore diameter. The polyolefin micro-porous membrane manufactured in the present invention has the characteristics of a high tenacity, a small pore diameter, a concentrated distribution, a good winding stability and a high number of cycles of a battery. When the polyolefin micro-porous membrane is used as a separator, the production safety of a battery can be improved, and the battery life can be prolonged.

IPC Classes  ?

• C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
• C08L 23/06 - Polyethene
• B32B 27/32 - Layered products essentially comprising synthetic resin comprising polyolefins

Abstract

Disclosed is a preparation method for an MBR flat filter membrane for domestic sewage treatment. The method comprises the following steps: modification of nanoparticles, preparation of a polyethylene membrane-casting solution, preparation of a polyethylene flat membrane, amino acid modification, and preparation of the MBR flat filter membrane. The chemical stability of the membrane is improved by using the advantages of polyethylene such as high air permeability, high crystallinity, good chemical stability, and corrosion resistance to most acids and alkalis; the modified nanoparticles are used as a main material, such that the prepared membrane has the advantages of antibacterial and hydrophilic properties; a hydrophilic substance amino acid solution is grafted on the surfaces of the nanoparticles, such that on the one hand, the agglomeration phenomenon of the nanoparticles can be reduced, on the other hand, the hydrophilicity of the membrane can be further improved and the water output flux of the membrane can be further increased; the interaction of hydrophilicity is formed between the inside and the surface of the membrane, such that the anti-pollution capability of the membrane is more excellent. The present invention is simple and feasible in process operation, and has stable process parameters, low requirements on a process environment, and low costs.

IPC Classes  ?

• B01D 63/08 - Flat membrane modules
• B01D 69/06 - Flat membranes
• B01D 71/26 - Polyalkenes
• B01D 67/00 - Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
• C02F 3/12 - Activated sludge processes

Abstract

Disclosed is a method for continuous testing of the voltage resistance of a thin film. The method comprises the following steps: (1) placing a thin film to undergo testing on a winding and unwinding device, and preparing to unwind the thin film; (2) configuring, by means of a central control system, the pressure range of a pressure booster pump to 0-5 MPa; (3) configuring, by means of the central control system, a heating rod to operate or to not operate; (4) configuring, by means of the central control system, an intermittent travel speed of the winding and unwinding device, a voltage boosting rate, and a breakdown current upper limit and/or a breakdown current lower limit; (5) turning on a switch of a test circuit, performing a programmed voltage boosting operation, and starting a test; (6) when a voltage resistance tester automatically powers off and a buzzer sounds, ending the test, and recording a display voltage of a present region at the time; and (7) performing continuous testing on different regions of the thin film by means of the winding and unwinding device, so as to obtain breakdown voltage data of the thin film. The method is employed to better simulate how a separator in a battery behaves under pressure and how well the separator is resistant to pressure, thereby facilitating an estimation of battery manufacturing, preventing inefficient use of raw materials during cell production, and improving yield.

IPC Classes  ?

• G01R 31/12 - Testing dielectric strength or breakdown voltage

Abstract

A dual hydrophilic polyethylene ultrafiltration membrane and a preparation method therefor. A chitosan (or derivative thereof)/nano-silica polyethylene ultrafiltration membrane is prepared by means of a combination of amine and hydroxyl in a polysaccharide polymer by using an organic-inorganic sol-gel on the basis of a thermally induced phase separation process; strong chelation is formed with metal ions by means of covalent bonds to form an inside-surface dual hydrophilic layer.

IPC Classes  ?

• B01D 71/26 - Polyalkenes
• B01D 67/00 - Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus

Abstract

Disclosed is a non-woven fabric substrate-supported polyethylene nanofiltration membrane, comprising a non-woven fabric substrate, a polyethylene microporous membrane, and a nanofiltration membrane skin layer. The polyethylene microporous membrane is supported on the non-woven fabric substrate so as to obtain a non-woven fabric-supported polyethylene microporous membrane. The non-woven fabric-supported polyethylene microporous membrane forms the nanofiltration membrane skin layer by means of interfacial polymerization of a polyamine aqueous-phase monomer and a polyacyl chloride oleic-phase monomer. Compared with a polyethylene microporous nanofiltration membrane without a non-woven fabric as a substrate for support, the present invention has a higher inorganic salt rejection rate, better and stable membrane filtration properties, and a longer service life. Compared with existing commercial polysulfone substrate nanofiltration membranes, the present invention can have higher flux and better overall performance while reaching the same rejection rate and service life.

IPC Classes  ?

• B01D 67/00 - Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
• B01D 69/10 - Supported membranesMembrane supports

Abstract

A non-woven fabric substrate-supported polyethylene nanofiltration membrane, comprising a non-woven fabric substrate (3), a polyethylene microporous membrane (2), and a nanofiltration membrane layer (1). The polyethylene microporous membrane (2) is supported on the non-woven fabric substrate (3), so as to obtain a non-woven fabric-supported polyethylene microporous membrane; and the nanofiltration membrane layer (1) is formed on the non-woven fabric-supported polyethylene microporous membrane by means of the interfacial polymerization of a polyamine aqueous-phase monomer and a polyacid chloride oil-phase monomer.

IPC Classes  ?

• B01D 69/10 - Supported membranesMembrane supports
• B01D 69/12 - Composite membranesUltra-thin membranes
• B01D 67/00 - Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
• B32B 27/32 - Layered products essentially comprising synthetic resin comprising polyolefins
• B32B 3/24 - Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shapeLayered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. apertured or formed of separate pieces of material characterised by an apertured layer, e.g. of expanded metal
• B32B 27/24 - Layered products essentially comprising synthetic resin characterised by the use of special additives using solvents or swelling agents
• B32B 27/08 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance of synthetic resin of a different kind
• B32B 27/06 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance
• B32B 27/02 - Layered products essentially comprising synthetic resin in the form of fibres or filaments
• B32B 27/36 - Layered products essentially comprising synthetic resin comprising polyesters
• B32B 27/40 - Layered products essentially comprising synthetic resin comprising polyurethanes
• B32B 27/34 - Layered products essentially comprising synthetic resin comprising polyamides
• B32B 33/00 - Layered products characterised by particular properties or particular surface features, e.g. particular surface coatingsLayered products designed for particular purposes not covered by another single class

Abstract

An outer packaging material for a battery apparatus, the material comprising a base layer (1), a bonding layer (2), a barrier layer (5), another bonding layer (7), and a hot-melt adhesive layer (8); the bonding layer (2) is disposed between the base layer (1) and the barrier layer (5); the other bonding layer (7) is disposed between the barrier layer (5) and the hot-melt adhesive layer (8); the barrier layer (5) is composed of a single layer or multiple layers of aluminum alloy foil; the aluminum alloy foil composition and the mass percentage thereof comprises over 1.2% Fe content and over 1% Mg content; after undergoing annealing treatment, a large amount of Mg will precipitate out from within the aluminum foil, and the ratio of the precipitated Mg amount to a precipitated Al amount is between 2-4.

IPC Classes  ?

• H01M 50/10 - Primary casingsJackets or wrappings
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
• B32B 27/34 - Layered products essentially comprising synthetic resin comprising polyamides
• B32B 15/20 - Layered products essentially comprising metal comprising aluminium or copper
• B32B 15/088 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin comprising polyamides
• B32B 15/085 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin comprising polyolefins
• B32B 27/32 - Layered products essentially comprising synthetic resin comprising polyolefins
• B32B 27/08 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance of synthetic resin of a different kind
• B32B 27/06 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance
• B32B 33/00 - Layered products characterised by particular properties or particular surface features, e.g. particular surface coatingsLayered products designed for particular purposes not covered by another single class
• B32B 27/36 - Layered products essentially comprising synthetic resin comprising polyesters
• B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties
• C22C 21/00 - Alloys based on aluminium

Abstract

Disclosed in the present invention is an isolating membrane of an electrochemical device, comprising a modified porous base membrane and a functional layer arranged on the surface of at least one side of the modified porous base membrane. The functional layer contains slurry of organic matter and inorganic matter compounds, and the modified porous base membrane contains particles of a lithium-containing conductive ion compound. According to the present invention, the lithium-containing conductive ion compound is prepared by adopting a sol-gel-hydrothermal method, and small-particle-size particles of the lithium-containing conductive ion compound are embedded into the isolating membrane base membrane, so that the defects of poor ionic conductivity and poor wettability of an existing isolating membrane are overcome, and moreover, the isolating membrane has good adhesion and heat resistance due to the coated functional layer.

IPC Classes  ?

• H01M 50/409 - Separators, membranes or diaphragms characterised by the material
• H01M 50/451 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic material
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries

Abstract

3; wherein, the weight of the water-soluble polymer is 5 to 50 parts, the weight of the antioxidant is 0.1 to 10 parts, based on 100 parts of the weight of the high molecular weight polyethylene. The porous membrane for water treatment prepared by the present invention has a thickness of 5 to 30 μm, a pore size of 10 to 100 nm, a porosity of 20 to 60%, and a surface contact angle of 30° to 95°. The porous membrane according to the present invention has good durability, simple preparation process, and relatively thin thickness, a uniform pore size distribution and small pore size, good hydrophilicity, as well as good filtration and adsorption effect.

IPC Classes  ?

• B01D 67/00 - Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
• B01D 69/02 - Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or propertiesManufacturing processes specially adapted therefor characterised by their properties
• B01D 71/26 - Polyalkenes
• B01D 71/38 - PolyalkenylalcoholsPolyalkenylestersPolyalkenylethersPolyalkenylaldehydesPolyalkenylketonesPolyalkenylacetalsPolyalkenylketals
• C02F 1/44 - Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
• H01M 50/417 - Polyolefins
• H01M 50/406 - MouldingEmbossingCutting
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries

Abstract

Disclosed are a separator for an electrochemical device, comprising a porous base membrane, a coating layer disposed on at least one side of the porous base membrane and at least one channel for ionic flow, wherein the coating layer comprises at least one organic material with, for example, a core-shell structure that melts when the electrochemical device is overheated to a temperature that is higher than the melting point of the at least one organic material to block the at least one channel for ionic flow; as well as an electrochemical device comprising the separator and a method for making the separator.

IPC Classes  ?

• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• H01M 50/417 - Polyolefins
• H01M 50/434 - Ceramics
• H01M 50/443 - Particulate material
• H01M 50/446 - Composite material consisting of a mixture of organic and inorganic materials
• H01M 50/451 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic material
• H01M 50/457 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers
• H01M 50/489 - Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
• H01M 50/491 - Porosity

Abstract

Disclosed are a coating slurry for preparing a separator for an electrochemical device, comprising at least one polymer having an intrinsic viscosity ranging from 0.5 to 3.0 mL/g, at least one inorganic filler, and at least one solvent; a method for preparing the coating slurry; and a method for preparing a separator for an electrochemical device using the coating slurry; as well as a separator and an electrochemical device comprising the separator.

IPC Classes  ?

• H01M 4/02 - Electrodes composed of, or comprising, active material
• H01M 50/446 - Composite material consisting of a mixture of organic and inorganic materials
• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• H01M 50/426 - Fluorocarbon polymers
• H01M 50/431 - Inorganic material
• C09D 127/16 - Homopolymers or copolymers of vinylidene fluoride
• C08K 3/22 - OxidesHydroxides of metals

Abstract

Disclosed herein are a coating slurry for preparing a separator, comprising at least one copolymer having a crystallinity degree ranging from 30% to 70%, at least one thickening agent, at least one binder, and water, wherein the at least one copolymer comprises a first structural unit and at least one second structural unit; a method for preparing the coating slurry disclosed herein; a method for preparing separators with the coating slurry disclosed herein; a separator for an electrochemical device prepared by the method disclosed herein; as well as an electrochemical device comprising the separator.

IPC Classes  ?

• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
• H01M 50/451 - Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic material

Goods & Services

Battery cell separators; lithium ion battery cell separators.

Abstract

A method for preparing a lithium-ion battery separator is disclosed. The method comprises: cooling and shaping a liquid-phase stabilization system containing polyethylene, stretching to enlarge pores, extracting with a solvent, and heat-setting to obtain a lithium-ion battery separator, wherein the stretching includes pre-stretching and synchronous bidirectional stretching, and the pre-stretching is completed before the synchronous bidirectional stretching.

IPC Classes  ?

• B29C 55/16 - Shaping by stretching, e.g. drawing through a dieApparatus therefor of plates or sheets multiaxial biaxial simultaneously
• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• B29C 41/00 - Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped articleApparatus therefor
• B29C 55/00 - Shaping by stretching, e.g. drawing through a dieApparatus therefor
• B29C 67/20 - Shaping techniques not covered by groups , or for porous or cellular articles, e.g. of foam plastics, coarse-pored
• B29C 71/02 - Thermal after-treatment
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
• H01M 50/411 - Organic material
• B29L 31/34 - Electrical apparatus, e.g. sparking plugs or parts thereof

Abstract

Disclosed are a separator for an electrochemical device, comprising a porous base membrane, a coating layer disposed on at least one side of the porous base membrane and at least one channel for ionic flow, wherein the coating layer comprises at least one organic material that melts when the electrochemical device is overheated to a temperature that is higher than the melting point of the at least one organic material to block the at least one channel for ionic flow; as well as an electrochemical device comprising the separator and a method for making the separator.

IPC Classes  ?

• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material

Abstract

Disclosed are a separator for an electrochemical device, comprising a porous base membrane, a coating layer disposed on at least one side of the porous base membrane and at least one channel for ionic flow, wherein the coating layer comprises at least one organic material with, for example, a core-shell structure that melts when the electrochemical device is overheated to a temperature that is higher than the melting point of the at least one organic material to block the at least one channel for ionic flow; as well as an electrochemical device comprising the separator and a method for making the separator.

IPC Classes  ?

• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements

Abstract

Disclosed is a porous membrane for water treatment, comprising: a high molecular weight polyethylene, a water-soluble polymer, and an antioxidant, wherein the high molecular weight polyethylene has an average molecular weight between 1.0 × 105-10.0 × 106, and a density between 0.940 g/cm3-0.976 g/cm3, and wherein based on the weight of the high molecular weight polyethylene of 100 parts, the weight of the water-soluble polymer is between 5-50 parts; and the weight of the antioxidant is between 0.1-10 parts. The prepared porous membrane for water treatment has a thickness between 5 µm-30 µm, a micropore diameter between 10 nm-100 nm, a porosity between 20%-60%, and a surface contact angle between 30º-95º. Also disclosed is a method for preparing the porous membrane for water treatment.

IPC Classes  ?

• B01D 71/26 - Polyalkenes
• B01D 67/00 - Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
• C02F 1/44 - Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis

Abstract

Disclosed herein are a coating slurry for preparing a separator, comprising at least one copolymer having a crystallinity degree ranging from 30%to 70%, at least one thickening agent, at least one binder, and water, wherein the at least one copolymer comprises a first structural unit and at least one second structural unit; a method for preparing the coating slurry disclosed herein; a method for preparing separators with the coating slurry disclosed herein; a separator for an electrochemical device prepared by the method disclosed herein; as well as an electrochemical device comprising the separator.

IPC Classes  ?

• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements
• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries

Abstract

Disclosed herein are a coating slurry for preparing a separator, comprising at least one copolymer having a crystallinity degree ranging from 30%to 70%and at least one solvent in which the at least one copolymer is dissolved, wherein the at least one copolymer comprises a first structural unit and at least one second structural unit; a method for preparing the coating slurry disclosed herein; a method for preparing separators with the coating slurry disclosed herein; a separator for an electrochemical device prepared by the method disclosed herein; as well as an electrochemical device comprising the separator.

IPC Classes  ?

• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements
• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
• H01M 10/058 - Construction or manufacture
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries

Abstract

Disclosed are a separator for an electrochemical device, comprising a porous base membrane and a coating layer being formed on at least one surface of the porous base membrane, wherein the coating layer comprises at least one heat-resistant polymer and at least one binder polymer; as well as an electrochemical device comprising the separator and a method for making the separator.

IPC Classes  ?

• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements
• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material

Abstract

Disclosed are a method for preparing a separator for an electrochemical device, comprising (1) mixing at least one polyethylene, at least one antioxidant, at least one auxiliary cross-linking agent, at least one photo-initiator and at least one pore-forming agent to obtain a mixture; (2) extruding the mixture to obtain an extruded mixture; (3) producing a ribbon from the extruded mixture; (4) removing the at least one pore-forming agent from the ribbon; (5) stretching the ribbon into a film; (6) thermoforming and winding the film to obtain an uncross-linked polymer separator; (7) applying a light irradiation to the uncross-linked polymer separator to obtain the cross-linked polymer separator; and (8) optionally annealing the cross-linked polymer separator; a cross-linked polymer separator for an electrochemical device prepared by the method; and an electrochemical device comprising the separator.

IPC Classes  ?

• C08J 9/18 - Making expandable particles by impregnating polymer particles with the blowing agent
• C08J 5/18 - Manufacture of films or sheets
• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements

Abstract

Disclosed are a separator for an electrochemical device, comprising a nonwoven porous substrate and at least one heat-resistant layer disposed on at least one side of the nonwoven porous substrate, comprising at least one heat-resistant polymer, wherein the separator has a breakdown temperature of 450℃ or above; as well as an electrochemical device including the separator and a method for making the separator.

IPC Classes  ?

• H01M 2/18 - Separators; Membranes; Diaphragms; Spacing elements characterised by the shape
• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material

Abstract

3, the content of the ethylene copolymer is 1-5 parts by weight, and the content of the grafting polyolefin is 0-5 parts by weight, on the basis that the total weight of the ultrahigh molecular weight polyethylene and the high-density polyethylene is 100 parts. The separator has a contact angle with lithium ion battery electrolyte of 20° to 40°.

IPC Classes  ?

• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements
• H01M 50/409 - Separators, membranes or diaphragms characterised by the material
• H01M 50/40 - SeparatorsMembranesDiaphragmsSpacing elements inside cells
• H01M 50/403 - Manufacturing processes of separators, membranes or diaphragms
• B29K 23/00 - Use of polyalkenes as moulding material
• H01M 4/02 - Electrodes composed of, or comprising, active material

Abstract

A coating slurry consisting essentially of: from 1 to 5 parts by weight of polyacrylonitrile; from 20 to 40 parts by weight of at least one solvent; from 1 to 5 parts by weight of at least one filler; and from 50 to 75 parts by weight of a polymer solution, a method for preparing the coating slurry, a method for making a separator using the coating slurry, as well as separators prepared by the method.

IPC Classes  ?

• C09D 127/16 - Homopolymers or copolymers of vinylidene fluoride
• C09D 133/20 - Homopolymers or copolymers of acrylonitrile
• C09D 7/61 - Additives non-macromolecular inorganic

Abstract

The invention discloses a polymer electrolyte membrane and a method for preparing the same. The method comprises the steps of: (1) mixing a molecular sieve material, a polymer and a solvent to obtain a slurry; (2) coating the slurry on a base membrane to form a wet membrane; (3) drying the wet membrane to obtain a dry membrane; and (4) immersing the dry membrane in a lithium salt electrolyte solution, and taking out to obtain a polymer electrolyte membrane.

IPC Classes  ?

• H01M 10/0565 - Polymeric materials, e.g. gel-type or solid-type
• C08J 5/18 - Manufacture of films or sheets
• H01M 10/052 - Li-accumulators
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
• H01M 10/0568 - Liquid materials characterised by the solutes

Abstract

Disclosed here area polymer solution, comprising an aromatic polymers having a structure of –C(=O) -N– and an intrinsic viscosity ranging from 0.5 dL/g to 1.45 dL/g, wherein the aromatic polymer is obtained by reacting aromatic diamines with compounds having acyl groups in a reaction system that comprises a solvent having a water content ranging from 3000 ppm to 5000 ppm; a method for preparing a separator with the polymer solution, separators prepared by the method disclosed herein, and electrochemical devices comprising the separator.

IPC Classes  ?

• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material

Abstract

Disclosed are a separator for an electrochemical device, comprising a nonwoven porous membrane and a heat-resistant layer being formed on at least one side of the nonwoven porous membrane, wherein the heat-resistant layer is formed by using a coating slurry that comprises from 1.5 to 6 parts by weight of at least one polyimide or polyimide precursor and from 0.5 to 4 parts by weight of at least one inorganic filler; as well as an electrochemical device including the separator and a method for making the separator.

IPC Classes  ?

• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material

Abstract

Disclosed are a separator for an electrochemical device, comprising a porous base membrane and a coating layer being formed on at least one side of the porous base membrane, wherein the coating layer comprises polybenzimidazoles having a weight average molecular weight ranging from 5×103to 1×106; as well as an electrochemical device including the separator and a method for making the separator.

IPC Classes  ?

• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements
• H01M 2/12 - Vent plugs or other mechanical arrangements for facilitating escape of gases
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries

Abstract

The present disclosure provides a method for preparing a coating slurry for preparing a separator, comprising dissolving aramids in an acid solution to obtain a carboxylated aramid solution; mixing the carboxylated aramid solution and a first solvent to obtain a first mixture; mixing an inorganic filler and a second solvent to obtain a second mixture; and mixing the first mixture and the second mixture; a method for preparing a separator with the coating slurry disclosed herein; a separator prepared by the method disclosed herein; as well as an electrochemical device comprising the separator disclosed herein.

IPC Classes  ?

• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements
• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material

Abstract

3; the temperature difference between pore closing temperature and film breaking temperature of the separator is 80-90° C., preferably 85-90° C., the heat shrinkage of the separator is 2.0% or less. The separator of the invention has a high temperature difference between film breaking temperature and pore closing temperature, and a low heat shrinkage; when the separator of the invention is used in an electrochemical device, the reliability and safety of electrochemical device can be effectively improved.

IPC Classes  ?

• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
• H01M 10/0565 - Polymeric materials, e.g. gel-type or solid-type
• H01G 9/02 - DiaphragmsSeparators
• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
• C08L 61/16 - Condensation polymers of aldehydes or ketones with phenols only of ketones with phenols
• B29D 7/01 - Films or sheets
• C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
• C08L 27/16 - Homopolymers or copolymers of vinylidene fluoride
• C08L 23/06 - Polyethene
• H01M 50/40 - SeparatorsMembranesDiaphragmsSpacing elements inside cells
• H01M 50/409 - Separators, membranes or diaphragms characterised by the material
• H01M 50/449 - Separators, membranes or diaphragms characterised by the material having a layered structure

Abstract

A separator (10) for an electrochemical device comprises a porous base membrane (11) and at least one partially-coated layer (13) disposed on at least one side of the porous base membrane (11), wherein the coated area (131) and the uncoated area (133) of the at least one partially-coated layer (13) are in an alternating coating pattern, and further wherein the coated area (131) are porous and comprise at least one adhesive material.

IPC Classes  ?

• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements
• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
• H01M 2/18 - Separators; Membranes; Diaphragms; Spacing elements characterised by the shape

Abstract

A process and an apparatus (100) for preparing a separator (107) for an electrochemical device are disclosed. The process comprises coating a first side of a porous base membrane (101) with a first coating slurry and coating a second side of the porous base membrane (101) with a second coating slurry to obtain a coated membrane (103) having a wet coating layer; immersing the coated membrane (103) having a wet coating layer in a water bath (130) to obtain a coated membrane (105) having a solvent-reduced coating layer; and drying the coated membrane (105) having a solvent-reduced coating layer.

IPC Classes  ?

• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material

Abstract

A polymer composition for forming a battery isolation membrane, a battery isolation membrane and a preparation method therefor. The polymer composition for forming the battery isolation membrane comprises: high molecular weight polyethylene with an average molecular weight of 1.0x105-10.0x106 and a density of 0.940-0.976 g/cm3, a pore forming agent, and an antioxidant. If the high molecular weight polyethylene is calculated in 100 parts by weight, the pore forming agent is 500-2000 parts by weight, and the antioxidant is 0.1-10 parts by weight. The polymer composition for forming a battery isolation membrane is used for forming a battery isolation membrane. The battery isolation membrane formed by using the polymer composition has a low micro-pore aperture, uniform and centralized aperture distribution, and good porosity and membrane strength, and two surfaces of the formed battery isolation membrane have closer microscopic appearances.

IPC Classes  ?

• C08L 23/06 - Polyethene
• C08K 5/00 - Use of organic ingredients
• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material

Abstract

Disclosed are a coating slurry for preparing a separator for an electrochemical device, comprising at least one polymer having an intrinsic viscosity ranging from 0.5 to 3.0 mL/g, at least one inorganic filler, and at least one solvent; a method for preparing the coating slurry; and a method for preparing a separator for an electrochemical device using the coating slurry; as well as a separator and an electrochemical device comprising the separator.

IPC Classes  ?

• C08J 5/22 - Films, membranes or diaphragms
• C09D 127/16 - Homopolymers or copolymers of vinylidene fluoride
• C08L 27/16 - Homopolymers or copolymers of vinylidene fluoride

Abstract

Disclosed in the present invention are a processing process and a processing device of a lithium battery separator. The processing process comprises manufacture of a lithium battery separator and a winding process, characterized in that at least one thin film backing and said lithium battery separator are wound together in the winding process, and said thin film backing is located on the outer surface or the inner surface of the lithium battery separator. The processing device of the lithium battery separator of the present invention comprises at least one thin film backing unwinding device provided at the places of coating and winding of the lithium battery separator, the thin film backing unwinding device allowing the thin film backing to wind along with the lithium battery separator and locate on the outer or inner surface of the lithium battery separator when the thin film backing is wound. The present invention solves the problem that the winding of the existing lithium battery separator thin film is not neat, the existing lithium battery separator is unwound or burst, and the thin film surface is uneven.

IPC Classes  ?

• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements

Abstract

A method for use in preparing a lithium-ion battery separator film, comprising the following steps: 1. extruding a mixed raw material to form a polyethylene solution; 2. cooling the polyethylene solution to form a sheet; 3. stretching the sheet to form a film; 4. performing extraction on the film to form a micro-porous film; and 5. performing heat setting on the micro-porous film to obtain a lithium-ion battery separator film; the mixed raw material in Step 1 comprises silane-grafted modified cross-linkable polyethylene and a filling agent. The battery separator film prepared by using said preparation method has a low pore-closing temperature and a high film-breaking temperature, which effectively improves the safety of batteries made with the film.

IPC Classes  ?

• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
• C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum

Abstract

Disclosed are a separator and an energy storage device prepared therefrom. The separator comprises a porous base film layer and a functional layer, wherein the functional layer comprises a high-temperature-resistant layer and a binder; and the binder is a polymer containing lithium ions.

IPC Classes  ?

• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material

Abstract

Disclosed are a separator for an electrochemical device, comprising a polyolefin microporous membrane and a heat-resistant layer being formed on at least one surface of the polyolefin microporous membrane, wherein the heat-resistant layer comprises at least one heat-resistant polymer and at least one inorganic filler in a weight ratio ranging from 100: 3 to 100: 30; as well as an electrochemical device including the separator and a method for making the separator.

IPC Classes  ?

• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements

Abstract

Disclosed are an isolation film and a preparation method therefor. The isolation film comprises a porous base film, a heat resistant polymer and an oxide filler.

IPC Classes  ?

• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material

Abstract

Disclosed in the present invention is a battery isolating membrane, the raw materials for making the isolating membrane comprising: (a) high molecular weight polyethylene of an average molecule weight of 1.0×105-8.0×106 and a density in the range of 0.940-0.976 g/cm3; (b) based on the weight of the high molecular weight polyethylene being 100 parts, 500-2000 parts by weight of pore-forming agent; and (c) based on the weight of the high molecular weight polyethylene being 100 parts, 0.1-10 parts of antioxidant.

IPC Classes  ?

• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements
• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material

Abstract

An isolation membrane, and an electrochemical device capable of resisting heavy impact and prepared from the isolation membrane, especially a lithium ion battery. The isolation membrane is provided with a porous mesh functional layer having the effect of enhancing interface binding on a porous basement membrane layer, so that the isolation membrane can bind adjacent structures in a battery, and these structures and the isolation membrane are integrated into a whole. The peel strength of the isolation membrane is significantly increased. Therefore, the interface binding between the isolation membrane and a positive electrode/negative electrode in the battery is significantly enhanced. Hence, the hardness of the battery is significantly increased, and the effect of resisting heavy impact is also significantly enhanced. The porous mesh functional layer has no effect on the total porosity and degree of permeability of the isolation membrane. The electrochemical device consists of a naked cell core, an electrolyte, and a packaging shell. The naked cell core comprises the isolation membrane. When the lithium ion battery is impacted by an external force, the naked cell core can still keep the high resistance to deformation, and the occurrence of safety accidents such as battery electrolyte leakage, a fire, and explosion is reduced.

IPC Classes  ?

• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material

Abstract

Provided are a battery separator film and method for fabrication thereof; in said method, a battery separator film is obtained by means of extruding mixed raw materials, cooling and forming, extracting, drawing, and heat-setting; said raw materials comprise ultra-high molecular weight polyethylene having a molecular weight of 1.0×106-10.0×106, high-density polyethylene having a molecular weight within the range of 0.940-0.976g/cm 3, an antioxidant, and a pore-forming agent; said method comprises crosslinking.

IPC Classes  ?

• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements
• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
• C08L 23/06 - Polyethene
• C08J 9/36 - After-treatment

Abstract

Provided are a battery separator film and method for fabrication thereof; in said method, a battery separator film is obtained by means of extruding mixed raw materials, cooling and forming, extracting, drawing, and heat-setting; said raw materials comprise ultra-high molecular weight polyethylene having a molecular weight of 1.0×106-10.0×106, high-density polyethylene having a molecular weight within the range of 0.940-0.976g/cm3, an antioxidant, and a pore-forming agent; said method comprises crosslinking.

IPC Classes  ?

• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements
• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material

Abstract

Disclosed are a separator for an electrochemical device and a preparation method therefor. The separator for an electrochemical device comprises a porous substrate and a high-viscosity polymer coating, wherein the high-viscosity polymer coating is located on at least one surface of the porous substrate, and the high-viscosity polymer coating contains high-viscosity polymer particles, an additive and an optional binder.

IPC Classes  ?

• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material

Abstract

Disclosed are a polymer electrolyte membrane and a method for preparing same. The method comprises the steps of: (1) mixing a molecular sieve material, a polymer, and a solvent to obtain a slurry; (2) coating the slurry on a base membrane to form a wet membrane; (3) drying the wet membrane to obtain a dry membrane; and (4) immersing the dry membrane in a lithium salt electrolyte solution, and then taking out the membrane to obtain a polymer electrolyte membrane.

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets
• H01M 10/052 - Li-accumulators

Abstract

Disclosed in the present invention are a high-wettability separator and a preparation method therefor. The separator comprises an ethylene copolymer, a grafting polyolefin, an ultra-high molecular weight polyethylene having a molecular weight ranging from 1.0×106 to 10.0×106, and a high-density polyethylene having a density ranging from 0.940 g/cm3 to 0.976 g/cm3, the content of the ethylene copolymer accounting for 1 part to 5 parts by weight, and the content of the grafting polyolefin accounting for 0 part to 5 parts by weight, on the basis that the total weight of the ultra-high molecular weight polyethylene and the high-density polyethylene is 100 parts. The contact angle between the separator and the electrolyte of a lithium-ion battery ranges from 20° to 40°.

IPC Classes  ?

• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements
• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries

Abstract

Disclosed are an isolation film with low shrinkage at a wide temperature range and a preparation method therefor, which fall within the technical field of electrochemistry. The isolation film of the present invention comprises an irradiation cross-linked fluorine-containing polymer A with a melting point of 150°C or more, and/or a polymer B containing a benzene ring in the backbone of a molecule; ultra-high molecular weight polyethylene with a molecular weight of 1.0×106 to 10.0×106; and high density polyethylene with a density within the range of 0.940-0.976 g/cm3. The temperature difference between the pore-closing temperature and the film-breaking temperature of the isolation film is 80°C-90°C, and is preferably 85°C-90°C, and the thermal shrinkage thereof is not higher than 2.0%. The isolation film of the present invention has a higher difference between the film-breaking temperature and the pore-closing temperature, and a lower thermal shrinkage. When the isolation film of the present invention is used in an electrochemical device, the reliability and safety of the electrochemical device are effectively improved.

IPC Classes  ?

• C08L 23/06 - Polyethene
• C08L 27/16 - Homopolymers or copolymers of vinylidene fluoride
• C08L 61/16 - Condensation polymers of aldehydes or ketones with phenols only of ketones with phenols
• C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
• B29D 7/01 - Films or sheets
• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements

Abstract

The present invention discloses an isolation membrane for an electrochemical apparatus, and a preparation method and application thereof. The isolation membrane comprises a porous base membrane layer and a functional layer; one or two surfaces of the porous base membrane layer are optionally provided with an inorganic material coating; and the functional layer is disposed on one or both sides of the porous base membrane layer. The functional layer includes at least one kind of organic material, and the at least one kind of organic material can form a gel-state electrolyte by contacting with a non-aqueous electrolyte solution.

IPC Classes  ?

• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries

Abstract

Disclosed is a method for preparing a lithium-ion battery separator. The method comprises: performing cooling, molding, stretching, and reaming on a liquid phase stable system that contains polyethylene, and then performing solvent extraction and thermoforming to obtain a lithium-ion battery separator, wherein the stretching and reaming processes comprise prestretching and simultaneous bidirectional stretching, and the prestretching is completed before the simultaneous bidirectional stretching.

IPC Classes  ?

• H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements
• H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material

Goods & Services

Battery separators; lithium ion battery separators