Tin dioxide doped flexible graphite bipolar plate and preparation method and application thereof

A technology of flexible graphite and tin dioxide, which is applied in the direction of electrochemical generators, fuel cells, collectors/separators, etc., can solve the problems of unsatisfactory electrical conductivity and achieve improved output performance and working life, high electrical conductivity, The effect of high density

Pending Publication Date: 2022-06-28
广东环华氢能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flexible graphite bipolar plate will go through the resin impregnation process to fill the internal micropores to ensure the airtightness of the bipolar plate, so the conductivity is not ideal

Method used

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  • Tin dioxide doped flexible graphite bipolar plate and preparation method and application thereof
  • Tin dioxide doped flexible graphite bipolar plate and preparation method and application thereof
  • Tin dioxide doped flexible graphite bipolar plate and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A tin dioxide-doped flexible graphite bipolar plate is prepared through the following steps.

[0046] 1) Immerse 0.10mol / L stannous chloride aqueous solution in negative pressure with a density of 0.05g / cm 3 Expanded graphite, followed by drying.

[0047] 2) The flexible expanded graphite was molded in a mold with a flow channel using a pressure of 15MPa to obtain an average density of 0.10g / cm 3 , Prefabricated flexible graphite bipolar plates with a thickness of 6mm.

[0048] 3) Immerse the 0.10mol / L stannous chloride aqueous solution in the prefabricated flexible graphite bipolar plate under negative pressure, then add 0.24mol / L sodium hydroxide aqueous solution to promote the formation of stannous oxide hydrate from the tin source, then dry and place in the A heat treatment process is performed at 500° C. to obtain a semi-finished flexible graphite bipolar plate with tin dioxide formed inside.

[0049] 4) Immerse the methanol solution of epoxy resin with a solid ...

Embodiment 2

[0053] A tin dioxide-doped flexible graphite bipolar plate is prepared through the following steps.

[0054] 1) Immerse 0.04mol / L stannous chloride aqueous solution in negative pressure with a density of 0.11g / cm 3 Expanded graphite, followed by drying.

[0055] 1) The flexible expanded graphite was molded in a mold with a runner using a pressure of 24MPa to obtain an average density of 0.18g / cm 3 , Prefabricated flexible graphite bipolar plates with a thickness of 5mm.

[0056] 2) Immerse the 0.04mol / L stannous chloride aqueous solution in the prefabricated flexible graphite bipolar plate under negative pressure, then add 0.06mol / L sodium hydroxide aqueous solution to promote the formation of stannous oxide hydrate from the tin source, then dry and place in the Heat treatment process at 600°C.

[0057] 3) Immerse an ethanol solution with a solid content of 8% polyacrylic resin into the semi-finished flexible graphite bipolar plate by vacuum impregnation.

[0058] 4) After...

Embodiment 3

[0062] A tin dioxide-doped flexible graphite bipolar plate is prepared through the following steps.

[0063] 1) Immerse 0.16mol / L stannous chloride aqueous solution in negative pressure with a density of 0.15g / cm 3 Expanded graphite, followed by drying.

[0064] 2) The flexible expanded graphite was molded in a mold with a flow channel using a pressure of 40MPa to obtain an average density of 0.25g / cm 3 , Prefabricated flexible graphite bipolar plates with a thickness of 4mm.

[0065] 3) Immerse 0.16 mol / L stannous chloride aqueous solution in the prefabricated flexible graphite bipolar plate under negative pressure, then add 0.30 mol / L sodium hydroxide aqueous solution to promote the formation of tin oxide hydrate from the tin source, then dry and place in Heat treatment process at 400°C.

[0066] 4) Immerse a phenolic resin solution with a solvent of 50% methanol, 30% ethanol, 10% isopropanol, 10% glycerol, and a solid content of 6% into the semi-finished flexible graphit...

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Abstract

The invention discloses a stannic oxide doped flexible graphite bipolar plate and a preparation method and application thereof, stannous chloride is used as a tin source, a stannous oxide hydrate is formed under an alkaline condition, high-conductivity stannic oxide can be formed in the flexible graphite bipolar plate through high-temperature heat treatment, and the conductivity of the flexible graphite bipolar plate is improved. And tin dioxide can also improve the hydrophilicity of the graphite bipolar plate, so that the subsequent resin aqueous solution is easier to impregnate, the flexible graphite bipolar plate with high conductivity and high density is obtained, the output performance of the fuel cell is improved, and the service life of the fuel cell is prolonged. The tin dioxide doping method used in the invention is simple, low in cost, especially suitable for rapid batch processing, and suitable for popularization and application in the field of flexible graphite bipolar plates of fuel cells.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a preparation method and application of a tin dioxide-doped flexible graphite bipolar plate. Background technique [0002] Hydrogen energy is a green and efficient secondary energy carrier. Hydrogen has a wide range of sources, and has the characteristics of high combustion calorific value, clean and pollution-free, and can be easily converted with various energy sources. It is an important part of the global future green energy. . A hydrogen fuel cell using hydrogen as fuel is a high-efficiency power generation device that directly converts the chemical energy stored in hydrogen and oxidant into electrical energy without combustion process. As the only by-product, water is clean and environmentally friendly, with high energy density and low noise. Etc. Hydrogen fuel cell is the key carrier to realize the conversion of hydrogen energy into electric energy. If the waste heat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0213H01M8/0223H01M8/0204
CPCH01M8/0213H01M8/0223H01M8/0204
Inventor 张锐明邓亮余孟杰孟子寒汤海波龚聪文
Owner 广东环华氢能科技有限公司
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