Abstract

The present application discloses a flexible rollable carbon paper, and the carbon paper has a thickness of 0.15˜0.25 mm, a volume density of 0.20˜0.45 g/cm3, and a porosity of 70˜90%; a flexible strength of 2060 Mpa, and a bending degree of 60˜180°; a surface resistivity ≤100 mΩ-cm; and a thermal conductivity ≥0.8 W/(m·K). The present application also discloses the processing technology and related processing systems of the paper and its intermediates.

IPC Classes  ?

• D21H 13/50 - Carbon fibres
• D21H 25/04 - Physical treatment, e.g. heating or irradiating
• D21H 27/30 - Multi-ply

Abstract

A gas diffusion layer, a preparation method therefor, a membrane electrode assembly and a fuel cell. The gas diffusion layer comprises gas diffusion layer substrates (41, 42) and a microporous layer slurry coated on the gas diffusion layer substrates (41, 42). An additive that contains catechol or contains a catechol structure compound is specifically added into the microporous layer slurry, and the additive is specifically dopamine hydrochloride.

IPC Classes  ?

• H01M 4/88 - Processes of manufacture
• H01M 4/86 - Inert electrodes with catalytic activity, e.g. for fuel cells
• H01M 8/1004 - Fuel cells with solid electrolytes characterised by membrane-electrode assemblies [MEA]

Abstract

A high-throughput carbon paper for a fuel cell. The carbon fiber paper has a thickness of 0.12 to 0.2 mm, a volume density of 0.25 to 0.40 g/cm 3, a porosity of 78 to 85%, and a permeability ≥ 2200 ml · mm (cm 2 · hr · mmyq); the surface resistivity is ≤ 100 m Ω · cm; and the thermal conductivity is ≥ 1.5 W (m · K). The carbon paper is prepared by stacking two to six layers of carbon fiber prepreg paper sheets layer by layer, performing continuous overall perforation, and then carrying out high-temperature treatment. A water-gas rapid channel is formed in the thickness direction of the carbon paper on the basis of dry method of paper making combined with a regular perforation design, facilitating high-throughput airflow channels, while retaining the lateral diffusion ability of water vapor in irregular pore channels.

IPC Classes  ?

• B32B 9/00 - Layered products essentially comprising a particular substance not covered by groups
• B32B 9/04 - Layered products essentially comprising a particular substance not covered by groups comprising such substance as the main or only constituent of a layer, next to another layer of a specific substance
• B32B 37/06 - Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
• B32B 38/08 - Impregnating
• D04H 1/4242 - Carbon fibres
• D06N 3/00 - Artificial leather, oilcloth, or like material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
• D21H 13/50 - Carbon fibres
• H01M 8/02 - Fuel cellsManufacture thereof Details
• D04H 1/4209 - Inorganic fibres

Abstract

A preparation method for ultrathin carbon fiber paper, comprising the following steps: step S1, using a carbon nanomaterial micro-powder, a carbon fiber, and a resin powder for ingredient preparation to obtain ingredients of carbon fiber paper; step S2, preparing a carbon fiber paper blank on the basis of the ingredients of the carbon fiber paper in combination with dry spraying and hot pressing processes; and step S3, performing high-temperature heat treatment on the carbon fiber paper blank to prepare ultrathin carbon fiber paper. The use of a nano modified resin powder mode facilitates the mixing uniformity of a nano material and a carbon fiber, and the thickness of the prepared carbon fiber paper is 0.02-0.12 mm. Also disclosed are corresponding ultrathin carbon fiber paper and a preparation device therefor, and a preparation process and device for a corresponding carbon fiber paper blank.

IPC Classes  ?

• D21F 13/00 - Methods or apparatus for making discontinuous sheets of paper, pulpboard, or cardboard, or of wet web, for fibreboard production
• D21F 13/10 - Methods or apparatus for making discontinuous sheets of paper, pulpboard, or cardboard, or of wet web, for fibreboard production using board presses
• D21H 13/50 - Carbon fibres
• D21H 17/00 - Non-fibrous material added to the pulp, characterised by its constitutionPaper-impregnating material characterised by its constitution
• D21H 17/35 - Polyalkenes, e.g. polystyrene

Abstract

Disclosed is flexible and rollable carbon paper. The carbon paper has a thickness of 0.15-0.25 mm, a volume density of 0.20-0.45 g/cm3, and a porosity of 70-90%; a flexible strength of 20-60 Mpa and a bending degree of 60-180º; a surface resistivity of ≤100 mΩ·cm; and a thermal conductivity of ≥0.8 W/(m.K). Further disclosed are a processing technology for the carbon paper itself and intermediates thereof, and a related processing system.

IPC Classes  ?

• B32B 27/10 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance of paper or cardboard
• 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 27/42 - Layered products essentially comprising synthetic resin comprising condensation resins of aldehydes, e.g. with phenols, ureas or melamines