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Carbon paper for gas diffusion layer, preparation method of carbon paper and fuel cell

A gas diffusion layer, carbon paper technology, applied in special paper, battery electrodes, papermaking, etc., can solve the problems of poor hydrophobicity and low porosity, achieve good electrical conductivity and hydrophobicity, improve battery performance, improve air permeability and The effect of drainage performance

Active Publication Date: 2021-05-07
GUANGZHOU AUTOMOBILE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of low porosity and poor hydrophobicity in the existing carbon paper for gas diffusion layer of fuel cell, the invention provides a carbon paper for gas diffusion layer and its preparation method, and fuel cell

Method used

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  • Carbon paper for gas diffusion layer, preparation method of carbon paper and fuel cell
  • Carbon paper for gas diffusion layer, preparation method of carbon paper and fuel cell
  • Carbon paper for gas diffusion layer, preparation method of carbon paper and fuel cell

Examples

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preparation example Construction

[0047] Another embodiment of the present invention provides a method for preparing carbon paper for a gas diffusion layer as described above, comprising the following steps:

[0048] Mix the porous carbon material into the mesophase pitch, stir and swell fully to prepare the mesophase pitch modified by the porous carbon material;

[0049] The mesophase pitch modified by the porous carbon material is melted and spun to prepare the as-spun fiber membrane;

[0050] Preoxidizing the primary fiber membrane to obtain a preoxidized fiber membrane;

[0051] The pre-oxidized fiber membrane is heat-treated under a protective atmosphere to graphitize the fibers in the pre-oxidized fiber membrane to obtain a three-dimensional cross-linked fiber membrane formed by a plurality of carbon fibers.

[0052] According to the preparation method provided by the present invention, the as-spun fiber membrane is prepared by melting and spinning the mesophase pitch modified by the porous carbon mater...

Embodiment 1

[0074] This embodiment is used to illustrate the carbon paper for gas diffusion layer disclosed by the present invention and its preparation method, including the following steps:

[0075] The three-dimensional graphene microporous carbon is pulverized by a jet mill, so that the average size of the particles is controlled at about 0.5um. The pore diameter range of the three-dimensional graphene microporous carbon is 5-15nm. Take 50g of the three-dimensional graphene microporous carbon Add the powder into 1kg of mesophase pitch (AR pitch), put it into a melting mixer for full stirring, stir at a temperature of 280°C for 30 minutes and then let it stand for swelling. After 30 minutes, take out the modified pitch and put it in a high-speed shearing machine. Shearing for 100 minutes, keeping the temperature at 320°C and rotating speed at 5000r / min during the shearing process, the three-dimensional graphene microporous carbon modified active mesophase pitch was prepared.

[0076] T...

Embodiment 2

[0080] This example is used to illustrate the carbon paper for gas diffusion layer disclosed by the present invention and its preparation method, including most of the operating steps in Example 1, the difference being:

[0081] The three-dimensional graphene microporous carbon is pulverized by a jet mill, so that the average size of the particles is controlled at about 0.1um. The pore diameter range of the three-dimensional graphene microporous carbon is 15-25nm. Take 60g of the three-dimensional graphene microporous carbon Add the powder into 1kg of mesophase pitch (AR pitch), put it into a melting mixer for full stirring, stir at a temperature of 280°C for 30 minutes and then let it stand for swelling. After 30 minutes, take out the modified pitch and put it in a high-speed shearing machine. Shearing for 100 minutes, keeping the temperature at 320°C and rotating speed at 5000r / min during the shearing process, the three-dimensional graphene microporous carbon modified active ...

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Abstract

In order to solve the problems of low porosity and poor hydrophobicity of the existing carbon paper for the gas diffusion layer of the fuel cell, the invention provides the carbon paper for the gas diffusion layer, the carbon paper for the gas diffusion layer comprises a three-dimensional cross-linked fiber membrane formed by a plurality of carbon fibers, and macropores are formed among the plurality of carbon fibers. A plurality of micropores are formed in the interior and the surface of each carbon fiber, and the micropores are communicated with the macropores. Meanwhile, the invention also discloses a preparation method of the carbon paper for the gas diffusion layer and a fuel cell. The carbon paper for the gas diffusion layer, provided by the invention, has relatively good air permeability and drainage performance, and the battery performance in a high-current-density region is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a carbon paper for a gas diffusion layer, a preparation method thereof, and a fuel cell. Background technique [0002] As an important part of a fuel cell, the gas diffusion layer can affect the transfer process and electrical conductivity of reactants and products, thereby affecting the performance of the fuel cell. At present, the base materials of the gas diffusion layer mainly include carbon fiber paper, carbon fiber woven cloth, non-woven cloth and carbon black paper, etc., and high-performance carbon paper is widely used. Carbon paper is usually made of carbon fiber plus an appropriate amount of adhesive using a papermaking process, and then impregnated with carbonizable resin, hot-pressed and solidified, and high-temperature carbonized. Carbon paper has a uniform porous structure, good strength and excellent electrical conductivity. , is the core component ...

Claims

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Application Information

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IPC IPC(8): D21H27/00H01M4/88
CPCD21H27/00H01M4/8807Y02E60/50
Inventor 钱秀洋杜沁伊周玉山裴锋长世勇
Owner GUANGZHOU AUTOMOBILE GROUP CO LTD
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