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Method for preparing double-microporous layers for improving performance of fuel batteries

A fuel cell and microporous layer technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of membrane damage and uneven surface morphology of the microporous layer, improve mass transfer performance, facilitate water management, Simple operation effect

Active Publication Date: 2017-01-04
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] According to the uneven surface morphology of the microporous layer in the prior art proposed above, which causes technical problems such as pressure concentration and membrane damage, a method for preparing a double-layer microporous layer that improves fuel cell performance is provided.

Method used

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  • Method for preparing double-microporous layers for improving performance of fuel batteries
  • Method for preparing double-microporous layers for improving performance of fuel batteries
  • Method for preparing double-microporous layers for improving performance of fuel batteries

Examples

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preparation example Construction

[0030] Such as figure 1 Shown, a kind of double-layer microporous layer preparation method that improves fuel cell performance comprises the steps:

[0031] S1. The highly conductive material, pore-forming agent, hydrophobic agent and dispersion liquid are prepared by stirring into the first slurry with uniform composition; the high-conductivity material is selected from carbon black; the pore-forming agent is selected from inorganic Pore-forming agent or organic pore-forming agent, described inorganic pore-forming agent is one or both in ammonium carbonate, ammonium oxalate, lithium carbonate; Described dispersion liquid is alcohols, selects ethanol, isopropanol, ethylene glycol One or two of them; the carbon paper or carbon cloth is impregnated with a 0.1%-5% PTFE water dispersion, with a thickness of 150 μm-300 μm and a porosity of more than 60%.

[0032] The preparation method of the first slurry is as follows: add a certain amount of carbon black into the dispersion medi...

Embodiment 1

[0040] This embodiment provides a method for preparing a microporous layer with high surface smoothness and good gas mass transfer performance, which includes the following steps:

[0041] 1) Weigh 3g of carbon black, 60ml of ammonium oxalate saturated aqueous solution, 10g of 20% PTFE diluent and pour it into a certain amount of isopropanol, stir evenly to make the first slurry with a viscosity between 250cp-350cp;

[0042] 2) Apply the above slurry on the hydrophobically treated carbon paper by screen printing to form a first coating layer with a coating thickness of 20 μm;

[0043] 3) Weigh 3g of carbon black, 10g of 20% PTFE dispersion and pour into a certain amount of isopropanol, mix evenly to make the second slurry with viscosity between 30cp-60cp;

[0044] 4) Apply the above-mentioned slurry to the surface of the first coating layer of screen printing by spraying to form a second spraying layer with a spraying thickness of 15 μm;

[0045] 5) Put the above slurry-coate...

Embodiment 2

[0052] The preparation method of the diffusion layer in Example 2 is the same as in Example 1, except that the thickness of the first microporous layer in Example 2 is 25 μm, and the thickness of the second microporous layer is 10 μm.

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Abstract

The invention provides a method for preparing double-microporous layers for improving the performance of fuel batteries. The method is characterized by comprising steps of preparing first slurry with uniform components from high-conductivity materials, pore forming agents, hydrophobic agents and dispersion liquid by means of stirring; coating the prepared first slurry on carbon paper or carbon cloth by means of screen printing to form a first coating layer; spraying second slurry with a preset thickness on the surface of the carbon paper or carbon cloth to form a second spraying layer; carrying out heat treatment to form loose, porous, hydrophilic and hydrophobic gas reaction channels. The carbon paper or carbon cloth is subjected to hydrophobic treatment before the first slurry is coated. The second slurry comprises high-conductivity materials, hydrophobic agents and dispersion liquid. The method has the advantages that operation procedures are simple, the method has low requirements on equipment, the pore diameters and the porosity of the double-microporous layers are sequentially reduced from the surface of the carbon paper to the surfaces of microporous layers, the double-microporous layers are high in flatness, damage to proton exchange membranes can be reduced, the service lives of membrane electrode assemblies can be prolonged, and the electric performance can be improved.

Description

technical field [0001] The invention belongs to the field of fuel cells, and mainly relates to the preparation of a gas diffusion layer of a fuel cell. The gas diffusion layer has double-layer microporous layers with different pore structures. The membrane electrode assembly (MEA) prepared by using the gas diffusion layer can not only improve the service life of the membrane electrode assembly but also help to optimize the mass transfer performance of the membrane electrode assembly. Background technique [0002] At present, in order to achieve better electrical performance, proton exchange membrane fuels for vehicles use thinner and thinner proton exchange membranes, and their thickness may be as low as 15 μm or even below 10 μm. Such a thin film has higher requirements on the surface roughness of the diffusion layer, otherwise it will cause the hidden danger of partial penetration of the film. In order to improve the mass transfer performance of the gas diffusion layer, t...

Claims

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Application Information

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IPC IPC(8): H01M8/0247H01M8/1004
CPCH01M8/0247H01M8/1004Y02E60/50
Inventor 王倩王伟石宋书范李光伟
Owner SUNRISE POWER CO LTD
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