High-pressure-resistant long-life gas diffusion layer, preparation method and fuel cell

A gas diffusion layer and long-life technology, applied in fuel cells, battery electrodes, circuits, etc., can solve the problems of poor bonding between metal mesh and PTFE/conductive agent film layer, easy separation, and fuel cell damage. Achieve the effect of improving electron conductivity and thermal conductivity, increasing assembly pressure and reducing thickness

Pending Publication Date: 2022-07-08
FAW JIEFANG AUTOMOTIVE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bonding force between the metal mesh and the polytetrafluoroethylene / conductive agent film layer in the gas diffusion layer is poor, and it is easy to separate during use, thereby causing damage to the fuel cell

Method used

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  • High-pressure-resistant long-life gas diffusion layer, preparation method and fuel cell
  • High-pressure-resistant long-life gas diffusion layer, preparation method and fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] This embodiment provides a high-pressure-resistant and long-life gas diffusion layer, the high-pressure-resistant and long-life gas diffusion layer includes an iron powder metallurgy mesh with a titanium carbide coating on the surface, and the powder metallurgy mesh includes a first An iron powder metallurgy mesh layer, a first hydrophobic layer, a second hydrophobic layer, and a second iron powder metallurgy mesh layer.

[0077] The pore diameter of the powder metallurgy mesh layer of the first iron ranges from 5 μm to 10 μm and the thickness is 0.5 μm; the pore diameter of the first hydrophobic layer is 1 μm to 3 μm and the thickness is 300 μm; the pore diameter of the second hydrophobic layer is 10 nm. ~20nm, the thickness is 70μm; the pore size range of the powder metallurgy mesh layer of the second iron is 5μm~10μm, and the thickness is 0.5μm.

[0078] The preparation method of the high-pressure resistant and long-life gas diffusion layer comprises the following st...

Embodiment 2

[0083] This embodiment provides a high-pressure-resistant and long-life gas diffusion layer, the high-pressure-resistant and long-life gas diffusion layer includes a stretched mesh of iron with a Cr coating on the surface, and the stretched mesh includes a first iron layer arranged in sequence The stretched mesh layer, the first hydrophobic layer, the second hydrophobic layer and the second iron stretched mesh layer.

[0084] The pore size of the stretched mesh layer of the first iron ranges from 80 μm to 100 μm and the thickness is 0.8 μm; the pore size range of the first hydrophobic layer is 30 μm to 50 μm and the thickness is 100 μm; the pore size range of the second hydrophobic layer is 450 nm. ~500nm, with a thickness of 30μm; the pore diameter of the stretched mesh layer of the second iron ranges from 80μm to 100μm, and the thickness is 2μm.

[0085] The preparation method of the high-pressure resistant and long-life gas diffusion layer comprises the following steps:

...

Embodiment 3

[0090] This embodiment provides a high-pressure-resistant and long-life gas diffusion layer. The high-pressure-resistant and long-life gas diffusion layer includes a titanium woven mesh with a chromium nitride coating on the surface, and the woven mesh includes a first titanium mesh arranged in sequence. The woven mesh layer, the first hydrophobic layer, the second hydrophobic layer and the second titanium woven mesh layer.

[0091] The pore diameter of the first titanium woven mesh layer is 15 μm to 20 μm and the thickness is 2 μm; the pore diameter of the first hydrophobic layer is in the range of 5 μm to 10 μm and the thickness is 400 μm; the pore diameter of the second hydrophobic layer is in the range of 80 nm to 100 nm. The thickness is 100 μm; the aperture of the second titanium woven mesh layer is 15 μm˜20 μm, and the thickness is 0.9 μm.

[0092] The preparation method of the high-pressure resistant and long-life gas diffusion layer comprises the following steps:

[...

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Abstract

The invention provides a high-pressure-resistant long-life gas diffusion layer, a preparation method and a fuel cell. The high-pressure-resistant long-life gas diffusion layer comprises a metal net, and a first hydrophobic layer and a second hydrophobic layer which are connected are arranged in the metal net; the aperture range of the first hydrophobic layer is 1 [mu] m-50 [mu] m, and the aperture range of the second hydrophobic layer is 10 nm-500 nm. The gas diffusion layer provided by the invention is flat in surface, small in contact resistance, high in drainage speed, high in electrical conductivity, small in thickness, high in strength and high in thermal conductivity. The high-voltage-resistant long-life gas diffusion layer does not contain a carbon material, so that the problem of carbon corrosion caused by gradual rising of the working voltage design of a membrane electrode is effectively solved; under the condition of high voltage caused by working conditions such as frequent start and stop, the high-voltage-resistant long-service-life gas diffusion layer has high stability.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a high-pressure-resistant and long-life gas diffusion layer, a preparation method and a fuel cell. Background technique [0002] Due to the continuous serious environmental pollution and resource shortage, proton exchange membrane fuel cells have attracted more and more countries and enterprises due to their advantages of high energy density, high energy conversion efficiency and no pollution to the environment. Proton exchange membrane fuel cells are being used more and more widely in the fields of new energy vehicles and distributed power generation. However, the reason for the slow pace of commercial application of PEM fuel cells is largely due to the problems of life and pressure resistance of PEM fuel cells. [0003] The 2040 fuel cell stack performance roadmap released by Japan's NEDO, in which the target peak power operating voltage in 2030 is 0.66V@3.8A / cm 2 , 0.2A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M8/1004
CPCH01M4/8657H01M8/1004Y02E60/50
Inventor 于力娜朱雅男刘晓雪吴芳敏张中天
Owner FAW JIEFANG AUTOMOTIVE CO
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