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Gas diffusion layer, preparation method and application thereof

A technology of gas diffusion layer and microporous layer, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of overall performance degradation of the battery and affect the coating quality, etc., to reduce ohmic polarization and concentration polarization, and improve Power requirements, the effect of reducing resistance

Pending Publication Date: 2022-02-25
FAW JIEFANG AUTOMOTIVE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above preparation method, there is no explanation for the stability and stable time of the slurry, and the conventional microporous layer slurry can only be kept for a few hours, which is not enough to maintain the subsequent coating process, and the agglomeration of the microporous layer slurry will affect the coating. coating quality, resulting in a significant decline in the overall performance of the battery

Method used

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  • Gas diffusion layer, preparation method and application thereof
  • Gas diffusion layer, preparation method and application thereof
  • Gas diffusion layer, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0094] This embodiment provides a figure 1 The preparation method of the gas diffusion layer shown, the gas diffusion layer includes a hydrophobic substrate 1 and a microporous layer 2, and the hydrophobic substrate 1 includes carbon paper;

[0095] The preparation method of the gas diffusion layer comprises the following steps:

[0096] (1) Ketjen black and polytetrafluoroethylene solution, at a temperature of 5°C, shear and mix at a speed of 5000rpm for 5min to obtain the first mixed solution;

[0097] In the polytetrafluoroethylene solution, the mass percentage of polytetrafluoroethylene is 10wt%, and the mass ratio of Ketjen black to polytetrafluoroethylene is 1:1;

[0098] (2) Deionized water and the first mixed solution obtained in step (1) were sheared and stirred at a temperature of 5° C. at a speed of 5000 rpm for 20 minutes to obtain a second mixed solution;

[0099] (3) The PEG-200 solution and the second mixed solution obtained in step (2) were sheared and stirre...

Embodiment 2

[0109] This embodiment provides a method for preparing a gas diffusion layer, the gas diffusion layer includes a hydrophobic substrate 1 and a microporous layer 2, and the hydrophobic substrate 1 includes carbon paper;

[0110] The preparation method of the gas diffusion layer comprises the following steps:

[0111] (1) The single-walled carbon nanotube and the polytetrafluoroethylene solution were sheared and mixed at a speed of 25000 rpm for 10 minutes at a temperature of 15° C. to obtain a first mixed solution;

[0112] In the polytetrafluoroethylene solution, the mass percentage of polytetrafluoroethylene is 65wt%, and the mass ratio of polytetrafluoroethylene to single-walled carbon nanotubes is 1:3;

[0113] (2) Ethylene glycol and the first mixed solution obtained in step (1) were sheared and stirred at a temperature of 15° C. at a speed of 25000 rpm for 30 minutes to obtain a second mixed solution;

[0114] (3) The ammonium oxalate solution and the second mixed soluti...

Embodiment 3

[0124] This embodiment provides a method for preparing a gas diffusion layer, the gas diffusion layer includes a hydrophobic substrate 1 and a microporous layer 2, and the hydrophobic substrate 1 includes carbon felt;

[0125] The preparation method of the gas diffusion layer comprises the following steps:

[0126] (1) Graphene and fluorinated ethylene propylene copolymer solution, at a temperature of 10 ° C, shear and mix at a speed of 20000 rpm for 7 minutes to obtain the first mixed solution;

[0127] In the fluorinated ethylene propylene copolymer solution, the mass percentage of the fluorinated ethylene propylene copolymer is 40wt%, and the mass ratio of the fluorinated ethylene propylene copolymer to graphene is 1:2;

[0128] (2) Ethanol and the first mixed solution obtained in step (1) were sheared and stirred at a temperature of 10° C. at a speed of 20,000 rpm for 25 minutes to obtain a second mixed solution;

[0129] (3) The ammonium chloride solution and the second ...

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Abstract

The invention provides a gas diffusion layer, a preparation method and an application thereof. The preparation method comprises the following step: coating a hydrophobic substrate with a microporous layer slurry to obtain the gas diffusion layer, wherein the microporous layer slurry is obtained by mixing conductive carbon and a sulfo hydrocarbon auxiliary agent. In order to improve the gas permeability of the gas diffusion layer and improve the physical and chemical properties of the gas diffusion layer, the sulfonyl hydrocarbon additive is adopted to establish an energy barrier in the microporous layer of the gas diffusion layer and reduce the agglomeration of particles in the slurry of the microporous layer so that the porosity of the gas diffusion layer is improved, and the resistance is reduced; and therefore, after the sulfonyl hydrocarbon auxiliary agent is added into the microporous layer of the gas diffusion layer, the dispersity of the slurry of the microporous layer is improved, the particle size of the slurry is obviously reduced, the resistivity, the porosity and the air permeability of the gas diffusion layer are also obviously improved, and the obtained gas diffusion layer can meet the power requirement of a battery under high current density.

Description

technical field [0001] The invention belongs to the field of proton exchange membrane fuel cells and relates to a diffusion layer, in particular to a gas diffusion layer and its preparation method and application. Background technique [0002] Because proton exchange membrane fuel cells have the characteristics of low operating temperature, fast start-up, high power density and mature applications, they have been widely used, especially in the automotive industry. However, the lifespan of the current fuel cell cannot meet the increasingly higher requirements of the current market, so improving the lifespan is one of the most important problems in solving the popularization and application of the fuel cell. [0003] The membrane electrode in the proton exchange membrane fuel cell is the core component. The gas diffusion layer is located between the flow field and the catalytic layer. Its function is to support the catalytic layer, stabilize the electrode structure, transfer p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/94
CPCH01M4/94H01M4/88Y02E60/50
Inventor 于力娜朱雅男唐柳米新艳王绍杉张中天王晶晶刘晓雪
Owner FAW JIEFANG AUTOMOTIVE CO