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A polymer-based gas diffusion layer sheet and its preparation method

A gas diffusion layer and polymer technology, applied in electrical components, fuel cells, electrochemical generators, etc., can solve the problems of easy bending and deformation of carbon cloth, low impact resistance, brittle carbon fiber paper, etc., and achieve both rigidity and tensile strength, improved service life, and excellent impact resistance

Active Publication Date: 2022-02-08
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Currently widely used fuel cell gas diffusion layer, the use of carbon fiber paper has the defects of brittleness and low impact strength, while the use of carbon cloth has the problem of easy bending and deformation. The present invention proposes a polymer-based gas diffusion layer sheet And preparation method, can effectively solve above-mentioned technical problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) First add the polymer substrate into the solvent, stir at high speed to form a fine slurry, then add nano-silicone powder, conductive agent, carbon fiber, polyaluminum, calcium chloride, and disperse evenly to prepare a coating slurry; polymer The substrate is polyethersulfoneketone; the solvent is dimethylformamide; the conductive agent is acetylene black;

[0032] Wherein: 33 parts by weight of polymer substrate, 41 parts by weight of solvent, 4 parts by weight of nano-silicone powder, 6 parts by weight of conductive agent, 5 parts by weight of carbon fiber, 5 parts by weight of polyaluminum, and 6 parts by weight of calcium chloride;

[0033] (2) First, the coating slurry obtained in step (1) is continuously scraped on the release film, then vacuum-dried, and then peeled off to remove the release film to obtain a polymer base film; the release film is a PET release film;

[0034] (3) First immerse the polymer base film obtained in step (2) into a composite liquid...

Embodiment 2

[0036] (1) First add the polymer substrate into the solvent, stir at high speed to form a fine slurry, then add nano-silicone powder, conductive agent, carbon fiber, polyaluminum, calcium chloride, and disperse evenly to prepare a coating slurry; polymer The substrate is polyethersulfoneketone; the solvent is dimethylacetamide; the conductive agent is carbon nanotubes;

[0037] Wherein: 35 parts by weight of polymer substrate, 35 parts by weight of solvent, 5 parts by weight of nano-silicone powder, 6 parts by weight of conductive agent, 6 parts by weight of carbon fiber, 6 parts by weight of polyaluminum, and 7 parts by weight of calcium chloride;

[0038] (2) Continuously scrape the coating slurry prepared in step (1) on the release film, then vacuum dry, and then peel off the release film to obtain a polymer base film; the release film is a PE release film;

[0039] (3) First immerse the polymer base film obtained in step (2) into a composite liquid prepared by sodium sulfa...

Embodiment 3

[0041](1) First add the polymer substrate into the solvent, stir at high speed to form a fine slurry, then add nano-silicone powder, conductive agent, carbon fiber, polyaluminum, calcium chloride, and disperse evenly to prepare a coating slurry; polymer The substrate is polyethersulfoneketone; the solvent is N-methylpyrrolidone; the conductive agent is graphene microplates;

[0042] Among them: 32 parts by weight of polymer substrate, 46 parts by weight of solvent, 3 parts by weight of nano-silicone powder, 5 parts by weight of conductive agent, 5 parts by weight of carbon fiber, 4 parts by weight of polyaluminum, and 5 parts by weight of calcium chloride;

[0043] (2) First, the coating slurry obtained in step (1) is continuously scraped on the release film, then vacuum-dried, and then peeled off to remove the release film to obtain a polymer base film; the release film is an OPP release film;

[0044] (3) First immerse the polymer base film obtained in step (2) into a compos...

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Abstract

The invention relates to the field of new energy batteries, and provides a polymer-based gas diffusion layer sheet and a preparation method. It includes the following preparation process: (1) adding polymer base material, nano-silicone powder, conductive agent, carbon fiber, polyaluminium, and calcium chloride into the solvent, and dispersing evenly to obtain a coating slurry; (2) continuously distributing the coating slurry Scratch coating on the release film, peel off the release film after drying to obtain a polymer base film; (3) Immerse the polymer base film in the composite liquid of sodium sulfate and silicic acid, then take it out, age, wash, dry, and finally pull Stretching and setting to obtain a polymer-based gas diffusion layer sheet. The invention integrates polymers and inorganic compounds so that the gas diffusion layer has both rigidity and impact resistance, and the prepared gas diffusion layer sheet does not deform or break, is easy to freely diffuse gas, and has excellent hydrophobicity.

Description

technical field [0001] The invention relates to the field of new energy batteries, in particular to the field of fuel cells, and specifically discloses a polymer-based gas diffusion layer sheet and a preparation method. Background technique [0002] As a high-efficiency and environment-friendly power generation device, fuel cell has become a research and development hotspot in various countries in recent years. Its core component, the three-in-one membrane electrode, is usually prepared by a gas diffusion layer, a catalytic layer and a proton exchange membrane through a hot pressing process. The gas diffusion layer is composed of conductive porous materials, which play multiple roles such as supporting the catalytic layer, collecting current, conducting gas and discharging water, and realizing the redistribution of reaction gas and product water between the flow field and the catalytic layer. One of the key components of performance. [0003] The bulk diffusion layer plays...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0239H01M8/0243H01M8/1004
CPCY02E60/50
Inventor 陈庆曾军堂
Owner CHENDU NEW KELI CHEM SCI CO LTD