Abstract

The present disclosure relates to a silver powder preparation method comprising: a silver powder preparation step of preparing a silver salt, which comprises silver ions, and then reducing the silver ion so as to precipitate silver particles; a silver powder recovery step of separating silver particles from an aqueous solution or a slurry, which comprises the precipitated silver particles, and then washing and drying same to recover silver powder; and a silver powder coating step of injecting a pH adjuster into the recovered silver powder to adjust the pH, and then injecting a coating agent to coat after the pH adjustment. The pH adjuster is used in the silver powder coating step to adjust the pH, and thus, when silver power is used in a conductive paste, as the rate of change in viscosity over time is low, a conductive paste having excellent viscosity stability can be provided.

IPC Classes  ?

• B22F 1/102 - Metallic powder coated with organic material
• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions

Abstract

G″×0.01)  [Equation 2]

IPC Classes  ?

• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• H01B 3/08 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartzInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances glassInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances glass woolInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances slag woolInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances vitreous enamels
• H01B 3/18 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances
• H01B 3/46 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances plasticsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances resinsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances waxes silicones
• H01L 31/0224 - Electrodes

Abstract

The present disclosure provides a conductive paste for a solar cell electrode, comprising a metal powder, a glass frit, a metal oxide, an organic binder and a solvent, wherein the metal oxide comprises at least one metal oxide selected from the group consisting of tungsten (W), antimony (Sb), nickel (Ni), copper (Cu), magnesium (Mg), calcium (Ca), ruthenium (Ru), molybdenum (Mo), and bismuth (Bi).

IPC Classes  ?

• H01L 31/0224 - Electrodes

Abstract

The present invention provides a conductive paste for a solar cell electrode, comprising metal powder, glass frit, and an organic vehicle, wherein the surface of the glass frit is primarily coated with an aliphatic amine and/or a fatty acid, and is secondarily coated with a second coating agent, so that dispersability is improved, and thus the electrical properties of a solar cell electrode formed using same are improved to enable the power generation efficiency of a solar cell to be enhanced.

IPC Classes  ?

• H01L 31/0224 - Electrodes
• C03C 4/14 - Compositions for glass with special properties for electro-conductive glass
• C03C 8/18 - Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill additions containing free metals
• H01B 1/16 - Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys

Abstract

The present invention can provide a conductive paste for a solar cell electrode, characterized by comprising: metal powders; a glass frit; an organic vehicle; and an additive, wherein the aspect ratio of silver crystals recrystallized during firing of the conductive paste is in an average range of 0.005 to 0.50, and thus, the conductive paste has the effect of improving efficiency by preventing leakage current due to recombination of electrons and holes during solar cell manufacturing.

IPC Classes  ?

• H01L 31/0224 - Electrodes
• C03C 4/14 - Compositions for glass with special properties for electro-conductive glass
• C03C 8/18 - Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill additions containing free metals
• C03C 8/10 - Frit compositions, i.e. in a powdered or comminuted form containing lead
• H01B 1/16 - Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys

Abstract

The present invention provides a silver powder coated with an organic material, wherein, when the physical adsorption amount and chemical coating amount of the organic material are measured, the chemical bonding amount of the organic material is 0.06-0.12 wt% on the basis of the total weight of the coated silver powder, and the chemical bonding amount on the basis of the sum of the physical adsorption amount and the chemical bonding amount is 60 wt% or more.

IPC Classes  ?

• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties
• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys

Abstract

The present invention relates to a silver powder preparation method comprising: a silver powder preparation step of preparing a silver salt, which comprises silver ions, and then reducing the silver ion so as to precipitate silver particles; a silver powder recovery step of separating silver particles from an aqueous solution or a slurry, which comprises the precipitated silver particles, and then washing and drying same to recover silver powder; and a silver powder coating step of injecting a pH adjuster into the recovered silver powder to adjust the pH, and then injecting a coating agent to coat after the pH adjustment. The pH adjuster is used in the silver powder coating step to adjust the pH, and thus, when silver power is used in a conductive paste, as the rate of change in viscosity over time is low, a conductive paste having excellent viscosity stability can be provided.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• B22F 1/02 - Special treatment of metallic powder, e.g. to facilitate working, to improve properties; Metallic powders per se, e.g. mixtures of particles of different composition comprising coating of the powder
• H01B 1/16 - Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys

Abstract

The present invention provides a conductive paste for a solar cell electrode, comprising a metal powder, a glass frit, a metal oxide, an organic binder and a solvent, wherein the metal oxide comprises at least one metal oxide selected from the group consisting of tungsten (W), antimony (Sb), nickel (Ni), copper (Cu), magnesium (Mg), calcium (Ca), ruthenium (Ru), molybdenum (Mo), and bismuth (Bi).

IPC Classes  ?

• H01L 31/0224 - Electrodes
• H01B 1/14 - Conductive material dispersed in non-conductive inorganic material
• H01B 1/02 - Conductors or conductive bodies characterised by the conductive materialsSelection of materials as conductors mainly consisting of metals or alloys
• H01B 1/08 - Conductors or conductive bodies characterised by the conductive materialsSelection of materials as conductors mainly consisting of other non-metallic substances oxides

Abstract

The present invention relates to a solar cell electrode conductive paste comprising a metal powder, glass frit and an organic vehicle. Lay-down factor A of a bus-bar electrode can be calculated by formula 1, lay-down factor B of a finger electrode can be calculated by formula 2, and │A-B│ is 0.100 or less, and since lay-down of the conductive paste decreases, manufacturing costs can be reduced. [Formula 1] A = (Slip velocity X 10) / (G' × 0.01) [Formula 2] B = 1 / (G" × 0.01)

IPC Classes  ?

• H01L 31/0224 - Electrodes
• H01B 1/16 - Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
• H01B 3/08 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartzInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances glassInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances glass woolInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances slag woolInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances vitreous enamels
• H01B 3/30 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances plasticsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances resinsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances waxes
• H01B 3/46 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances plasticsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances resinsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances waxes silicones

Abstract

The present invention relates to a conductive paste characterized by comprising a metal powder, a solvent, an organic binder, and a glass frit, wherein the value of A in the following equation 1 is 2 to 7. The conductive paste that satisfies the abovementioned parameter has the effect of achieving good printability without disconnection even when applied to a screen mask having a high mesh and a narrow finger opening. [Equation 1] A=T100/(slip velocity/minimum shear stress)

IPC Classes  ?

• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• H01B 1/16 - Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
• H01L 31/0224 - Electrodes

Abstract

The present invention relates to a conductive paste for a solar cell electrode, the conductive paste comprising metal powder, glass frit, an organic vehicle, and silicone oil, wherein the mass of the metal powder and the mass of the silicone oil are determined by an MPP index defined by equation 1 below, and the MPP index is 20-500, and the conductive paste can improve the power generation efficiency of a solar cell without a big change in conventional manufacturing conditions. [Equation 1] MPP index=(mass of metal powder)/(mass of silicone oil)

IPC Classes  ?

• H01B 1/16 - Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• H01B 3/08 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartzInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances glassInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances glass woolInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances slag woolInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances vitreous enamels
• H01B 3/46 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances plasticsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances resinsInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances waxes silicones
• H01L 31/0224 - Electrodes

Abstract

22, and 2 mole% to 5 mole% of the oxide of antimony (Sb). The conductive paste for a solar cell electrode can reduce contact resistance and increase the open-circuit voltage of a solar cell to improve the conversion efficiency thereof, while also improving bonding characteristics.

IPC Classes  ?

• H01B 1/16 - Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• H01B 3/08 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartzInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances glassInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances glass woolInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances slag woolInsulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of inorganic substances vitreous enamels
• C03C 8/10 - Frit compositions, i.e. in a powdered or comminuted form containing lead
• H01L 31/0224 - Electrodes

Abstract

The present invention relates to a solar cell electrode conductive paste and a preparation method therefor, the conductive paste comprising: metal powder; a glass frit; an organic vehicle; and a wax solution, wherein the wax solution is a solution in which a wax-based compound is activated in a polydimethylsiloxane-based compound, and the present invention can stably implement a fine line width of a solar cell front electrode formed using same and can improve the power generation efficiency of a solar cell by enhancing an electric property of the electrode.

IPC Classes  ?

• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• C03C 8/14 - Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill additions
• H01L 31/0224 - Electrodes
• H01L 31/0216 - Coatings
• H01B 13/00 - Apparatus or processes specially adapted for manufacturing conductors or cables

Abstract

The present invention relates to a conductive paste for a solar cell electrode, the conductive paste comprising a metal powder, glass frit, and an organic vehicle, wherein the glass frit contains an alkaline metal oxide and the metal powder contains an alkaline ingredient.

IPC Classes  ?

• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• C03C 8/14 - Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill additions
• H01L 31/0224 - Electrodes
• H01L 31/0216 - Coatings
• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof

Abstract

The present invention provides a conductive paste for a solar cell electrode, the conductive paste comprising metal powder, a glass frit, and an organic vehicle, wherein the surface of the glass frit is coated with an aliphatic amine and a fatty acid, and thus the present invention improves dispersability so as to improve the electrical property of a solar cell electrode formed using same, thereby enabling the power generation efficiency of a solar cell to be enhanced.

IPC Classes  ?

• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• C03C 8/14 - Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill additions
• H01L 31/0224 - Electrodes
• H01L 21/02 - Manufacture or treatment of semiconductor devices or of parts thereof

Abstract

Provided may be a conductive paste for a solar cell electrode, wherein the conductive paste is an electrode paste for a solar cell, and includes a metal powder, a glass frit, an organic vehicle, silicone oil and additives. According to the present invention, using the silicone oil in the paste resolves the problem of phase separation, and slippage is significantly improved, thus enabling the implementation of fine line widths.

IPC Classes  ?

• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• C03C 8/14 - Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill additions
• H01L 31/0224 - Electrodes
• H01L 31/0216 - Coatings

Abstract

The present invention relates to a method for producing silver powder, which includes a silver salt reduction step (S2) comprising: a reaction liquid preparation step (S21) of preparing a first reaction liquid containing a silver ion, ammonia, an alkali metal salt of an organic acid, and a phosphorus compound, and a second reaction liquid containing a reducing agent; and a precipitation step (S22) of obtaining silver powder by reacting the first reaction solution and the second reaction solution, wherein the sintering properties of the produced silver powder can be adjusted by controlling the content of the phosphorus compound and the reaction temperature of the precipitation step, and can provide a method for producing silver powder in which shrinkage at a rising temperature section of 500℃ can be adjusted in a range of 5 to 20% under a rising temperature condition of 50℃/min up to 800℃.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions

Abstract

The present invention relates to a silver powder preparation method for controlling the degree of agglomeration of a washed silver powder by controlling washing temperature, stirring speed and stirring time in a washing step during preparation of a silver powder. When a conductive paste comprising a silver powder having a controlled degree of agglomeration is prepared, the conductive paste has high viscosity and elasticity, is advantageous in the formation of a pattern with a high aspect ratio, and has satisfactory printing characteristics since the conductive paste does not cause wire breakage during printing of an electrode.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• C03C 8/14 - Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill additions

Abstract

The present invention provides a solar cell electrode manufactured by applying a conductive paste comprising a metal powder, a glass frit, a metal oxide, an organic binder and a solvent, and then drying and firing same, wherein the upper shape of an electrode formed using the conductive paste is controlled by adjusting the components and amount of the organic binder.

IPC Classes  ?

• H01L 31/0224 - Electrodes
• H01L 31/0216 - Coatings
• C08K 3/08 - Metals
• C08K 3/22 - OxidesHydroxides of metals
• C08K 3/40 - Glass
• C08L 1/26 - Cellulose ethers
• C08L 33/00 - Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereofCompositions of derivatives of such polymers
• C08L 61/04 - Condensation polymers of aldehydes or ketones with phenols only

Abstract

The present invention is a method for predicting rheological properties of a paste containing a raw material and a solvent, which can predict the rheological properties through a relative comparison of values calculated using parameters related to solubility of the solvent contained in the paste. Thus, the present invention enables convenient adjustment of the ingredients and contents of the solvent without repeated experiments in order to obtain the rheological properties required of a particular paste.

IPC Classes  ?

• G01N 11/00 - Investigating flow properties of materials, e.g. viscosity or plasticityAnalysing materials by determining flow properties

Abstract

The present invention relates to a parameter for a conductive paste comprising metal powder, a solvent, an organic binder, and a glass frit, and a parameter relating to a viscosity for improving the printing property of the conductive paste is provided so that the conductive paste satisfying the parameter has an improved long time printing property.

IPC Classes  ?

• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• C03C 8/14 - Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill additions

Abstract

The method for preparing a silver powder according to the present invention relates to a method for preparing a silver powder, comprising: a reaction solution preparation step (S21) for preparing a first reaction solution comprising a silver ion, ammonia (NH3), and an organic acid alkali metal salt, and a second reaction solution comprising a reducing agent; and a salt reduction step (S2) comprising a deposition step (S22) for acquiring a silver powder by allowing the first reaction solution and the second reaction solution to free fall in the air and react, wherein a monodispersed silver powder having a SEM size of 0.3-1.3 μm can be acquired by depositing the silver powder through the mid-air free fall method.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties

Abstract

The present invention provides a paste composition for a solar cell electrode, comprising conductive metal powder, glass frit, and organic vehicles, wherein the conductive metal powder comprises at least two surface treatment parts positioned at the outer periphery thereof, and one of the surface treatment parts is silicone oil.

IPC Classes  ?

• C09D 5/24 - Electrically-conducting paints
• H01L 31/0224 - Electrodes
• H01L 31/0216 - Coatings
• H01B 1/02 - Conductors or conductive bodies characterised by the conductive materialsSelection of materials as conductors mainly consisting of metals or alloys

Abstract

A method for producing a silver powder according to the present invention includes a silver salt reduction step (S2) comprising: a reaction solution production step (S21) for producing a first reaction solution, which includes silver ions, ammonia, and an organic acid alkali metal salt, and a second reaction solution, which includes a reducing agent and sodium sulfate; and a precipitation step (S22) for obtaining a silver powder by reacting the first reaction solution and the second reaction solution.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties

Abstract

33), an organic acid alkali metal salt and ammonium nitrate, and a second reaction solution including a reducing agent; and a precipitation step (S22) of obtaining silver powder by reacting the first reaction solution and the second reaction solution with each other.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys

Abstract

The present invention relates to a method for surface treating a silver powder and a method for preparing a surface-treated silver powder, and provides a conductive paste having a low thixotropic ratio and comprising a surface-treated silver powder by surface treating a silver powder with a first treatment agent comprising an anionic surfactant and a second treatment agent comprising a fatty acid or a fatty acid salt, and thus a conductive paste is advantageous for high-speed printing and micropattern printing.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• B22F 1/02 - Special treatment of metallic powder, e.g. to facilitate working, to improve properties; Metallic powders per se, e.g. mixtures of particles of different composition comprising coating of the powder
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• C03C 8/14 - Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill additions

Abstract

The present invention relates to a conductive paste for a solar cell electrode, comprising a metal powder, a glass frit and an organic vehicle, wherein the surface of the glass frit is coated with an aliphatic amine compound. The surface of the glass frit is coated with an aliphatic amine compound such that dispersibility is improved, and thus the electrical properties of a solar cell electrode formed by using the same are improved, thereby enabling power generation efficiency of a solar cell to be improved.

IPC Classes  ?

• H01L 31/0224 - Electrodes
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• C03C 8/14 - Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill additions
• C03C 8/22 - EnamelsGlazesFusion seal compositions being frit compositions having non-frit additions containing two or more distinct frits having different compositions
• H01L 31/0216 - Coatings
• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof

Abstract

The present invention relates to a method for surface-treating silver powder, and a method for preparing surface-treated silver powder, and provides silver powder having an excellent sintering density when high-temperature sintering the silver powder at a temperature of 700 °C or higher by surface-treating the silver powder by using a high-quality amine.

IPC Classes  ?

• B22F 1/02 - Special treatment of metallic powder, e.g. to facilitate working, to improve properties; Metallic powders per se, e.g. mixtures of particles of different composition comprising coating of the powder
• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys

Abstract

When silver powder is produced by using a reducing agent according to a wet reduction method, the present invention has no risk of fire by washing insoluble organic materials generated after a silver powder precipitation reaction with an aqueous solution comprising alkali metal borohydrides, is capable of increasing cleaning efficiency at low costs, reduces aggregation of the silver powder to be produced, and reduces the content of residual alkali metals. Accordingly, it is possible to provide silver powder having improved physical properties.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• C03C 8/14 - Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill additions

Abstract

A glass frit, according to an embodiment of the present invention, is a glass frit contained in a conductive paste for a solar cell electrode, which comprises an alkali metal oxide, wherein the total molar ratio of the alkali metal oxide to the total glass frit is 0.1 to 0.2.

IPC Classes  ?

• C03C 8/14 - Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill additions
• C03C 8/20 - Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill additions containing titanium compoundsGlass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill additions containing zirconium compounds
• H01L 31/0224 - Electrodes
• H01L 31/0216 - Coatings
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys

Abstract

The present invention relates to a conductive paste for a solar cell electrode, the conductive paste containing a metal powder, glass frit, an organic binder, and a solvent, wherein a surface of the metal powder is coated with an alkyl amine-based material having 6 to 24 carbon atoms. The surface of the metal powder is coated with a coating agent with low solubility, thereby stably realizing a fine line width of solar cell front electrodes, formed by using the conductive paste, and improving electrical characteristics of the electrodes, leading to an improvement in power generation efficiency of a solar cell.

IPC Classes  ?

• H01L 31/0216 - Coatings
• H01L 31/0224 - Electrodes
• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
• C08K 3/08 - Metals
• C08K 9/04 - Ingredients treated with organic substances
• C08K 3/40 - Glass

Abstract

The present invention provides an electroconductive paste for a solar cell electrode, comprising a metal powder, glass frit, a metal oxide, an organic binder, and a solvent, wherein the metal oxide comprises an oxide of at least one kind of metal selected from a group consisting of tungsten (W), antimony (Sb), nickel (Ni), copper (Cu), magnesium (Mg), calcium (Ca), ruthenium (Ru), molybdenum (Mo), and bismuth (Bi).

IPC Classes  ?

• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• C03C 8/14 - Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill additions
• H01L 31/0224 - Electrodes
• H01L 31/0216 - Coatings
• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof

Abstract

The present invention relates to a conductive paste for a solar cell electrode, comprising: a metal powder; glass frit; and organic vehicles, wherein the glass frit includes a first glass frit having a first glass transition temperature and a second glass frit having a second glass transition temperature that is higher than the first glass transition temperature, wherein the glass frit is contained in an amount of 1-10% by weight with respect to the total weight of the paste, the content of the first glass frit being larger than that of the second glass frit. The present invention can improve the conversion efficiency and adhesion characteristics of a solar cell by using two or more kinds of glass frits having different glass transition temperatures in combination.

IPC Classes  ?

• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• C03C 8/22 - EnamelsGlazesFusion seal compositions being frit compositions having non-frit additions containing two or more distinct frits having different compositions
• C03C 8/14 - Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill additions
• H01L 31/0224 - Electrodes
• H01L 31/0216 - Coatings
• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof

Abstract

The present invention relates to a method for preparing silver powder, comprising: a silver salt solution preparation step (S11) of adding and mixing a solvent with a silver nitrate solution, nitric acid, and ammonia water to prepare a silver salt solution; a reducing solution preparation step (S2) of adding and mixing a solvent with a reducing agent to prepare a reducing solution; a reductive reaction step (S31) of mixing and stirring the silver salt solution and the reducing solution to precipitate silver particles, wherein the silver nitrate solution in the silver salt solution preparation step (S11) is added in a controlled amount to prepare the silver salt solution (S12) and the stirring in the reductive reaction step (S31) is performed at a controlled speed to precipitate the silver particles (S32), whereby the silver powder thus obtained can be improved in dispersibility. The present invention can provide a method by which silver powder prepared without adding an additive such as a dispersant, etc. can be improved in dispersibility while retaining its own properties.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• H01B 1/16 - Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
• H01L 31/0224 - Electrodes

Abstract

The present invention relates to a solar cell electrode conductive paste composition comprising a conductive metal powder, glass frits, and an organic vehicle, and provides glass frits, of a specific composition, having a lateral shape of which the surface slope to be measured increases and then decreases according to the relative height from a wafer, and when an electrode is formed by using a conductive paste comprising the glass frits of the composition, wetting characteristics and spreadability are improved such that short-circuit current increases by increasing the light-receiving area of a solar cell, and contact resistance is improved such that an effect of increasing fill factor (FF) is provided, and thus the power generation efficiency of a solar cell can be improved.

IPC Classes  ?

• H01L 31/0224 - Electrodes
• H01L 31/0216 - Coatings
• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
• C03C 8/10 - Frit compositions, i.e. in a powdered or comminuted form containing lead
• C03C 8/04 - Frit compositions, i.e. in a powdered or comminuted form containing zinc
• C03C 8/12 - Frit compositions, i.e. in a powdered or comminuted form containing lead containing titanium or zirconium
• H01B 1/02 - Conductors or conductive bodies characterised by the conductive materialsSelection of materials as conductors mainly consisting of metals or alloys

Abstract

The present invention relates to a conductive paste for a solar cell electrode comprising a metal powder, a glass frit, an organic binder, and a solvent. By mixing at least two or more kinds of solvents including a first solvent and a second solvent as the solvent to adjust a surface tension and a boiling point of the solvent, it is possible to enhance conductivity by improving an aspect ratio, i.e., a line width and line pitch, of an electrode which is formed using the conductive paste according to the present invention. In addition, as the line width of the electrode decreases, a light receiving surface increases to provide a solar cell having high generation efficiency.

IPC Classes  ?

• H01L 31/0224 - Electrodes
• H01L 31/0216 - Coatings
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof

Abstract

The present invention provides a solar cell substrate having an electrode provided on the upper part of the substrate, wherein the electrode is formed by sintering: a lower printed layer formed by being printed with a conductive paste comprising a first metal powder and a first glass frit; and an upper printed layer formed by being printed on the upper part of the lower printed layer with a conductive paste comprising a second metal powder and a second glass frit, wherein an average particle diameter (D50) of the second metal powder is smaller than an average particle diameter (D50) of the first metal powder, and a glass transition temperature of the second glass frit is higher than a glass transition temperature of the first glass frit.

IPC Classes  ?

• H01L 31/0248 - SEMICONDUCTOR DEVICES NOT COVERED BY CLASS - Details thereof characterised by their semiconductor bodies
• H01L 31/04 - SEMICONDUCTOR DEVICES NOT COVERED BY CLASS - Details thereof adapted as photovoltaic [PV] conversion devices
• H01L 31/0224 - Electrodes
• H01L 31/0216 - Coatings
• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof

Abstract

The present invention relates to a conductive paste for a solar cell electrode, which comprises a metal powder, a glass frit, an organic vehicle and a dispersant, wherein the dispersant is a low-molecular dispersant having a molecular weight of between 100 and 1000 g/mol. Thus, it is possible to shorten a dispersion process and time, exhibit low viscosity and easily adjust a content, and secure the stability of the conductive paste produced by maximizing a dispersion effect.

IPC Classes  ?

• H01L 31/0224 - Electrodes
• H01L 31/0216 - Coatings
• C08K 5/098 - Metal salts of carboxylic acids
• C08K 5/17 - AminesQuaternary ammonium compounds
• C08K 5/36 - Sulfur-, selenium-, or tellurium-containing compounds

Abstract

According to the present invention, in a process for producing a silver powder, the content of a surface treatment agent coated on silver powder can be controlled by adjusting the content of a base or acid, which is a second surface treatment agent in a surface treatment step, to adjust the form of a surface treatment agent, present in an aqueous solution functioning as a dispersion medium, to be in the form of a salt, a partial salt (semi-salt), and an emulsion, and variable physical properties of a conductive paste including the produced silver powder can be controlled more simply and in a greater variety of ways without an additional surface treatment process. By adjusting the content of the second surface treatment agent, a conductive paste having a high yield value and storage modulus can be obtained. Therefore, an electrode pattern that is advantageous for forming a fine pattern and has a high aspect ratio can be formed.

IPC Classes  ?

• B22F 1/02 - Special treatment of metallic powder, e.g. to facilitate working, to improve properties; Metallic powders per se, e.g. mixtures of particles of different composition comprising coating of the powder
• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys

Abstract

The present invention relates to a method for preparing a silver powder, comprising a silver salt reduction step (S2) comprising: a reaction solution preparation step (S21) of preparing a first reaction solution containing a silver ion, ammonia (NH3), and a phosphorus compound and a second reaction solution containing a reducing agent and ascorbic acid; and a precipitation step (S22) of obtaining a silver powder by reacting the first reaction solution and the second reaction solution, and can provide: a silver powder having a large crystallite diameter, a low amount of remaining organic material, and high shrinkage by controlling the amounts of the phosphorous compound and the ascorbic acid; and a conductive paste comprising the same.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• H01L 31/0224 - Electrodes
• H01L 31/0216 - Coatings

Abstract

The present invention relates to a method for preparing a silver powder, comprising a silver salt reduction step (S2) comprising: a reaction solution preparation step (S21) of preparing a first reaction solution containing a silver ion, ammonia, and an organic acid alkali metal salt and a second reaction solution containing a reducing agent; and a precipitation step (S22) of obtaining a silver powder by reacting the first reaction solution and the second reaction solution, and the sintering characteristics of a silver powder to be prepared can be controlled by using an alkali metal salt.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties

Abstract

The present invention provides a conductive paste for a solar cell electrode, the conductive paste comprising: metal powder; a glass frit; an organic binder; a silicone-based additive; and a solvent, wherein the silicon-based additive includes trimethylsiloxy terminated polydimethylsiloxane, and can enhance conductivity by improving an aspect ratio of an electrode, which is formed by using the conductive paste, that is, a width and a height, thereby providing a solar cell having high power generation efficiency because of an increase of a light receiving surface according to the reduction of the width of the electrode.

IPC Classes  ?

• H01L 31/0224 - Electrodes
• H01L 31/0216 - Coatings
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• C07F 7/08 - Compounds having one or more C—Si linkages
• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof

Abstract

The present invention relates to conductive paste for a solar cell electrode, the paste comprising: metal powder; glass frit; and an organic vehicle, wherein the metal powder comprises metal powder having a sintering shrinkage of 15-30%. Therefore, a light receiving area of a solar cell front electrode formed using the conductive paste, which comprises the metal powder having an increased sintering shrinkage, is increased, and a short circuit current (Isc) is increased such that power generation efficiency of a solar electrode can be improved.

IPC Classes  ?

• H01L 31/0224 - Electrodes
• H01L 31/0216 - Coatings
• H01B 1/20 - Conductive material dispersed in non-conductive organic material
• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof

Abstract

The present invention relates to a method for preparing a silver powder for high temperature sintering, and to a method for preparing a silver powder by preparing a first reactant solution comprising silver ions and ammonia and a second reactant solution comprising a reducing agent, and by precipitating a silver powder by reacting the prepared first reactant solution and second reactant solution. Since the stirring time is controlled when the first reactant solution is prepared, a silver powder having a high sintering density can be prepared during high temperature sintering.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions

Abstract

The present invention relates to silver powder for a solar cell electrode and a preparation method therefor, the silver powder having a lightness index (L*) of 80 or greater, measured by using a spectrum colorimeter for a coating film formed from paste comprising the silver powder, wherein the chromaticity of silver powder prepared by adjusting an addition amount of a phosphorous compound is adjusted in a preparation process of the silver powder, thereby increasing power generation efficiency of a solar cell comprising a front surface electrode manufactured by using conductive paste comprising the silver powder.

IPC Classes  ?

• H01L 31/0224 - Electrodes
• H01L 31/0216 - Coatings
• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof

Abstract

The present invention relates to a method for preparing agglomerated silver powder comprising: a reaction liquid preparation step (S11) for preparing a silver source solution containing silver (Ag) and preparing a reducing solution containing a reducing agent; and a silver reduction step (S12) for adding the reducing solution to the prepared silver source solution with a feed rate so as to precipitate agglomerated silver powder. The present invention can provide a method for preparing agglomerated silver powder, which can easily control the properties of agglomerated silver powder to be prepared such as a primary particle size and a specific surface area by adjusting the feed rate of a reducing solution, and a method for preparing flake silver powder by using the same.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties

Abstract

The present invention relates to a manufacturing method for a flake silver powder, the method comprising a flaking step (S2) of obtaining a flaked powder by milling through beads using an agglomerated silver powder as a raw material powder, wherein the agglomerated silver powder has an average diameter of 2.0 to 10.0 μm and a specific surface area of 1.0 to 2.5 m2/g by agglomerating primary silver particles having a diameter of 0.1 to 0.8 μm. Provided according to the present invention is a manufacturing method wherein, by using an agglomerated powder rather than a spherical powder as a raw material powder, a general-purpose milling device and beads are used to produce, at low cost, a uniform and fine flake silver powder which exhibits no agglomeration between powders and exhibits excellent electrical conductivity thanks to the wide contact area between the particles.

IPC Classes  ?

• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys

Abstract

The present invention relates to a method for preparing a flake-type silver powder, comprising a flaking step (S2) of using an agglomerated silver powder as a material powder so as to obtain a powder flaked by means of milling through beads, wherein the agglomerated silver powder is obtained by agglomerating silver particles having a diameter of 0.5-2.0 μm and has an average diameter of 5.0-20.0 μm and a specific surface area of 0.1-0.6 m2/g. The present invention can provide a method for preparing a flake-type silver powder having a small thickness and a large average diameter, that is, having a high aspect ratio (diameter/thickness), the method enabling: preparation with low preparation costs by using universal milling facilities and beads since an agglomerated powder instead of a spherical powder is used as a material powder; and particle size to be controlled while minimizing the compression between flake-type silver powders to be prepared since the particle size of the agglomerated powder is controlled.

IPC Classes  ?

• B22F 9/04 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys

Abstract

The present invention relates to a method for preparing a silver powder, comprising: a silver salt solution preparation step (S1) of preparing a silver salt solution by adding a silver nitrate solution, nitric acid, and ammonia water to a solvent and mixing the same; a reducing solution preparation step (S2) of preparing a reducing solution by mixing and adding hydraquinone and ascorbic acid to a solvent; and a reduction reaction step (S3) of precipitating silver particles by mixing the silver salt solution and the reducing solution. Provided is a method for preparing, without using other equipment, a silver powder having an increased specific surface area, while maintaining the spherical shape of the silver powder.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties

Abstract

The present invention provides a paste composition, for a solar cell electrode, comprising conductive metal powder, glass frit and an organic vehicle, wherein the glass transition temperature (Tg) of the glass frit is equal to or higher than 200℃ and lower than 300℃.

IPC Classes  ?

• H01L 31/0216 - Coatings
• C03C 17/04 - Surface treatment of glass, e.g. of devitrified glass, not in the form of fibres or filaments, by coating with glass by fritting glass powder
• H01L 31/0224 - Electrodes
• H01L 31/04 - SEMICONDUCTOR DEVICES NOT COVERED BY CLASS - Details thereof adapted as photovoltaic [PV] conversion devices
• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof

Abstract

The present invention provides a paste composition, for a solar cell electrode, comprising conductive metal powder, glass frit and an organic vehicle, wherein two or more types of particles having varied average particle diameters (D50) are used for the glass frit, wherein the average particle diameter of one or more types of the particles is in the range of from 3 ㎛ to 10 ㎛.

IPC Classes  ?

• H01L 31/0216 - Coatings
• H01B 1/16 - Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
• H01B 1/22 - Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
• H01L 31/0224 - Electrodes
• H01L 31/04 - SEMICONDUCTOR DEVICES NOT COVERED BY CLASS - Details thereof adapted as photovoltaic [PV] conversion devices
• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof

Abstract

A paste composition for a solar cell electrode, according to the present invention, comprises conductive metal powder, glass frit and an organic vehicle. The paste composition further comprises a polyether-modified silicone additive, thereby enabling reduction of the line width of an electrode in the same printing condition and heat treatment process as well as reduction of a line width increase of the electrode after sintering.

IPC Classes  ?

• H01L 31/0216 - Coatings
• C08L 83/12 - Block- or graft-copolymers containing polysiloxane sequences containing polyether sequences
• H01L 31/0224 - Electrodes
• H01L 31/04 - SEMICONDUCTOR DEVICES NOT COVERED BY CLASS - Details thereof adapted as photovoltaic [PV] conversion devices
• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof

Abstract

The present invention provides a paste composition, for a solar cell electrode, comprising conductive metal powder, glass frit and an organic vehicle, wherein a crystallization peak occurs at a temperature lower than 500℃ in accordance with differential scanning calorimetry (DSC) data of the glass frit.

IPC Classes  ?

• H01L 31/0216 - Coatings
• H01B 1/16 - Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
• H01L 31/0224 - Electrodes
• H01L 31/18 - Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof

Abstract

The present invention relates to a method for preparing a silver powder, the method comprising a silver salt preparing step (S1) comprising: a silver nitrate preparing step (S11) for dissolving silver (Ag) grains with a specific surface area of 0.001-0.01 m2/g in a nitric acid (HNO3) solution, thereby preparing a silver nitrate solution; and a silver nitrate concentrating step (S12) for heating the prepared silver nitrate solution to remove nitric acid, thereby obtaining a concentrated silver nitrate solution. The present invention can provide a prompt and economical preparation method by preparing a silver salt using silver grains, and can provide a preparation method capable of controlling the particle size of a silver powder precipitated by an application of a concentrating process.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions

Abstract

The present invention relates to a production method for a silver powder, the method comprising: a silver salt reducing step (S2) including a reaction-fluid production step (S21) involving the production of a first reaction fluid comprising silver ions, ammonia and nitric acid, and a second reaction fluid comprising a reducing agent; and a precipitation step (S22) in which a silver powder is obtained by reacting the first reaction fluid and the second reaction fluid. The production method makes it possible to produce a silver powder having a shrinkage ratio of no more than 10% in the 260-400°C interval.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties

Abstract

The present invention relates to a preparing method for a silver powder, the method comprising a salt reducing step (S2) which comprises: a reaction liquid preparing step (S21) for preparing a reaction liquid containing a silver ion, a reductant, and a phosphate compound; and a precipitating step (S22) for obtaining a silver powder through a reaction of the reaction liquid. Accordingly, the present invention provides a silver powder that has an organic material content of 1.0 wt% or less, a crystallite diameter in the range of 250-600 Å, and a phosphor (P) content in the range of 0.002-0.03 wt%.

IPC Classes  ?

• B22F 9/24 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties

Abstract

The present invention relates to a method for recovering cobalt and nickel, through a series of steps comprising ion exchange, Fe removal, solvent extraction, and concentration/crystallization, from a waste solution generated during a process of recovering nickel from low-grade limonite. According to the method of the present invention, cobalt and nickel can be effectively recovered by adjusting the pH of a waste solution, which is discarded when recovering nickel, to 3-6 under a nitrogen atmosphere and using an ion exchange resin of two or more columns, thereby enabling the waste solution, generated when recovering nickel, to be recycled and cobalt and nickel to be obtained at lower cost.

IPC Classes  ?

• C22B 23/00 - Obtaining nickel or cobalt
• C22B 7/00 - Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof

Abstract

The present invention relates to a method for collecting scandium from residue generated during the collection of nickel from low-grade nickel ore, through a series of procedures, including leaching, neutralization, dissolving, solvent extraction, neutralization-precipitation, and firing. The method of the present invention allows an effective collection of scandium from residue discarded at the time of nickel collection, and thus can reutilize the residue generated at the time of nickel collection and obtain scandium at lower costs.

IPC Classes  ?

• C22B 59/00 - Obtaining rare earth metals
• C22B 7/00 - Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof

Abstract

Valuable metals such as cobalt, nickel, manganese, and lithium can be economically recovered from various lithium secondary battery-related wastes by the inventive method which comprises liquid-phase leaching a scrap powder containing Co, Ni, Mn, and Li, and purifying and solvent-extracting the resulting leaching solution to recover each of said Co, Ni, Mn, and Li, wherein the liquid-phase leaching is performed by a two-step counter-current leaching using an inorganic acid solution or a mixed solution of an inorganic acid and hydrogen peroxide.

IPC Classes  ?

• C22B 3/06 - Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions
• C22B 7/00 - Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof
• C22B 23/00 - Obtaining nickel or cobalt
• C22B 26/12 - Obtaining lithium