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Gas diffusion layer, preparation method thereof and fuel cell

A gas diffusion layer and fuel cell technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of high processing cost, complex process, and low conductivity of products, and achieve precise controllable pore size and pore spacing. The effect of simple process and wide industrial value

Active Publication Date: 2018-02-09
SHENZHEN SOUTHERNTECH FUEL CELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process is complex, with many steps, industrialization is difficult, and the product conductivity is low
[0007] Therefore, the traditional gas diffusion layer has disadvantages such as low strength, high brittleness, fragility during operation, insufficient lateral thermal conductivity, high processing cost, and complicated process, and the controllability, consistency, and designability of the pore structure preparation are relatively low. Low, it is difficult to combine theoretical simulation calculation and optimal design of material transmission

Method used

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  • Gas diffusion layer, preparation method thereof and fuel cell

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preparation example Construction

[0048] The present invention also provides a method for preparing a gas diffusion layer 8, the gas diffusion layer 8 is the above gas diffusion layer 8, and the preparation method includes the following steps:

[0049] Coating the conductive paint on at least one side of the substrate 1 , forming a conductive microporous layer 2 by sintering, and combining the substrate 1 and the conductive microporous layer 2 into one.

[0050] Based on the total weight of solid matter in the conductive paint as 100%, the conductive paint comprises the following raw materials in weight percentages:

[0051] Conductive particles 50-80wt%, such as 50wt%, 55wt%, 60wt%, 65wt%, 70wt%, 75wt% or 80wt%, etc.;

[0052] Adhesive 10-30wt%, such as 10wt%, 15wt%, 20wt%, 25wt% or 30wt%, etc.;

[0053] Surfactant 1-5wt%, such as 1wt%, 2wt%, 3wt%, 4wt% or 5wt%, etc.;

[0054] Carbon fiber 0-10wt%, such as 0, 2wt%, 5wt%, 8wt% or 10wt%, etc.;

[0055] Pore ​​forming agent 1-5wt%, such as 1wt%, 2wt%, 3wt%, 4...

Embodiment 1

[0075] A method for preparing a gas diffusion layer 8, comprising the following steps:

[0076] (1) A porous graphite paper substrate with a thickness of 100 μm, a pore diameter of 200 μm, and a pore spacing of 100 μm was obtained by laser drilling.

[0077] (2) Dissolve 0.6g of polyethylene glycol octylphenyl ether in 40g of water, stir well, then slowly add 10g of flake graphite powder with a particle size of 2μm, 2g of acetylene black, 0.4g of carbon fiber powder and 0.5g of ammonium bicarbonate ; Then take 10g mass fraction of 60% polytetrafluoroethylene solution and 1g mass fraction of 0.6% carboxymethyl cellulose solution and add dropwise to the above slurry, and disperse evenly to obtain conductive coating.

[0078] (3) Scrape-coat the conductive paint onto the porous graphite paper substrate obtained in step (1) by spraying, with a spraying thickness of 150 μm.

[0079] (4) Sintering at a temperature of 250° C. for 2 hours in a nitrogen atmosphere to obtain a gas diffus...

Embodiment 2

[0081] A method for preparing a gas diffusion layer 8, comprising the following steps:

[0082] (1) A porous graphite paper substrate with a thickness of 200 μm, a pore diameter of 500 μm, and a pore spacing of 160 μm was obtained by laser drilling.

[0083] (2) Dissolve 1g of alkylphenol polyoxyethylene ether in 30g of water and stir evenly; then slowly add 15g of flexible worm graphite, 5g of carbon fiber powder and 1g of ammonium oxalate with a particle diameter of 80 objects; The polytetrafluoroethylene solution and 1 g of carboxymethyl cellulose solution with a mass fraction of 0.6% were added dropwise to the slurry, and dispersed evenly to obtain a conductive coating.

[0084] (3) Scrape-coat the conductive paint onto the porous graphite paper substrate obtained in step (1) by a scrape-coating method, with a scrape-coating thickness of 100 μm.

[0085] (4) Sintering at a temperature of 330° C. for 1 h in a nitrogen atmosphere to obtain the gas diffusion layer 8 with the...

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Abstract

The invention discloses a gas diffusion layer, a preparation method thereof and a fuel cell. The gas diffusion layer comprises a base and a conducting micropore layer arranged on at least one side surface of the base, wherein the base is porous graphite paper. According to the gas diffusion layer disclosed by the invention, the porous graphite paper is adopted as the base, pores in the porous graphite paper base form longitudinal fast channels for moisture transfer, the micropore layer provides longitudinal and transverse transfer paths, so that the whole active area is covered with moisture transfer conveniently; moreover, the gas diffusion layer disclosed by the invention has the advantages that the raw materials are easily obtained, the processing technology is simple and the cost is low; and the gas diffusion layer has preferable flexibility and preferable mechanical property.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a gas diffusion layer, a preparation method thereof and a fuel cell. Background technique [0002] A fuel cell is a device that directly converts chemical energy into electrical energy. It uses hydrogen, natural gas, methanol and other fuels and pure oxygen or air as raw materials to undergo oxidation-reduction reactions at the cathode and anode of the battery, thereby continuously generating direct current. Fuel cells can be divided into six categories: phosphoric acid fuel cell (PAFC), molten carbonate fuel cell (MCFC), solid oxide fuel cell (SOFC), direct methanol fuel cell (DAFC), alkaline fuel cell (AFC) and proton exchange membrane fuel cells (PEMFC). Among them, the proton exchange membrane fuel cell is considered to be the most promising technology for aerospace, military, electric vehicles and regional industries due to its advantages of no noise, zero pollution, no c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/86H01M4/8807Y02E60/50
Inventor 陶有堃黄鹏辉谢小军蒋晓强李佳佳王海江李辉
Owner SHENZHEN SOUTHERNTECH FUEL CELL CO LTD
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