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A kind of preparation technology of composite membrane for fuel cell

A preparation process and fuel cell technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of gas leakage through composite membranes, battery performance degradation, uneven distribution, etc., to improve the operating environment, increase adhesion, good uniformity

Active Publication Date: 2022-01-28
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of preparing the composite membrane in the existing technology, on the one hand, the resin liquid is unevenly distributed in the pores of the microporous membrane, and some micropores cannot be immersed in the resin, and a layer of resin film is formed on the surface of the microporous membrane, resulting in the composite membrane. During the operation of the battery, phenomena such as gas penetration and hydrogen permeation occur; on the other hand, the composite membrane prepared by directly impregnating the resin with a microporous membrane has a low proton conductivity, and the filled resin is easy to produce during the operation of the battery. The degradation of strong oxides such as hydroxyl radicals not only causes membrane perforation, but also is prone to risks such as hydrogen leakage. In addition, the composite membrane prepared by a single impregnation method still cannot solve the defect of battery performance degradation under high temperature and low humidity conditions.

Method used

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  • A kind of preparation technology of composite membrane for fuel cell
  • A kind of preparation technology of composite membrane for fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0046] a, basement membrane pretreatment: put the expanded polytetrafluoroethylene microporous membrane with a pore size of 1 μm, a porosity of 90%, and a thickness of 1 μm into 3 wt% H 2 o 2 In the solution, cook at 60°C for 20 minutes, and then rinse with a large amount of deionized water. The washing method is to completely immerse the basement membrane in deionized water for 5 seconds and then take it out. Repeat the soaking-taking process 5 times, and there is no H on the surface. 2 o 2 After remaining, soak the base film in isopropanol solvent for 30 minutes, take it out and dry it for 2 hours, then place it in a closed space filled with oxygen, and irradiate it with an ultraviolet lamp with a wavelength of 185nm for 10 minutes, and set it aside.

[0047] b. Solution configuration: take a Nafion solution (perfluorosulfonic acid resin solution) with a concentration of 5wt%, dilute it to a concentration of 0.1wt% with isopropanol as a low-concentration perfluorosulfonic a...

Embodiment 2

[0054] a, basement membrane pretreatment: put the expanded polytetrafluoroethylene microporous membrane with a pore size of 10 μm, a porosity of 80%, and a thickness of 15 μm into 3wt% H 2 o 2 In the solution, cook at 60°C for 20 minutes, and then rinse with a large amount of deionized water. The washing method is to completely immerse the basement membrane in deionized water for 6 seconds and then take it out. Repeat the soaking-taking process 7 times, and there is no H on the surface. 2 o 2 After remaining, soak the base film in isopropanol solvent for 30 minutes, take it out and dry it for 2 hours for later use, then place it in a closed space filled with oxygen, and irradiate it with an ultraviolet lamp with a wavelength of 185nm for 15 minutes for later use.

[0055] b. Solution configuration: take a Nafion solution with a concentration of 5wt%, dilute it to a concentration of 0.5wt% with an isopropanol solvent as a low-concentration perfluorosulfonic acid resin solution...

Embodiment 3

[0062] a, basement membrane pretreatment: put the expanded polytetrafluoroethylene microporous membrane with a pore size of 20 μm, a porosity of 65%, and a thickness of 30 μm into 3wt% H 2 o 2 In the solution, cook at 60°C for 20 minutes, and then rinse with a large amount of deionized water. The washing method is to completely immerse the basement membrane in deionized water for 8 seconds and then take it out. Repeat the soaking-taking process 8 times, and there is no H on the surface. 2 o 2 After remaining, soak the base film in isopropanol solvent for 30 minutes, take it out and dry it for 2 hours for later use, then place it in a closed space filled with oxygen, and irradiate it with an ultraviolet lamp with a wavelength of 185nm for 10 minutes for later use.

[0063] b. Solution configuration: take a Nafion solution with a concentration of 5wt%, dilute it to a concentration of 1wt% with isopropanol solvent as a low-concentration perfluorosulfonic acid resin solution, and...

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Abstract

The invention discloses a preparation process of a composite membrane for a fuel cell. The composite membrane uses an expanded polytetrafluoroethylene microporous base membrane as a skeleton, and is impregnated with mixed liquids of different concentrations from low to high. Specifically, a treatment pool The medium is a mixture of perfluorosulfonic acid resin solution with a concentration of 0.1wt%-1wt%, water retaining agent and free radical quencher, and the second treatment pool is a mixture of perfluorosulfonic acid resin solution with a concentration of 2wt%-6wt%. The mixed liquid of the water retaining agent and the free radical quencher, the mixed liquid of the concentration of 7wt%-20wt% perfluorosulfonic acid resin and sulfonated polyether ether ketone in the third treatment tank. The proton exchange composite membrane prepared by the process of the present invention does not produce pore residue, avoids the occurrence of hydrogen permeation during use, and can simultaneously meet the requirements of mechanical strength, dimensional stability and excellent electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a preparation process of a composite membrane for fuel cells. Background technique [0002] Proton exchange membrane fuel cells (PEMFC) have the advantages of high power density, high energy conversion efficiency, low temperature start-up, and environmental friendliness, and are widely used in aerospace, energy, transportation, and military fields. Proton exchange membrane (PEM) is one of the core components of the battery, which is the substrate of the electrolyte (proton transfer) and electrode active material (catalyst); in addition, PEM is also a dense selective permeable membrane, which is different from the usual porous film. An ideal PEM has high proton conductivity, low gas permeability, high mechanical strength, thermal and chemical stability, and suitable cost performance. [0003] The currently used perfluorosulfonic acid proton exchange membrane has good proton c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1023H01M8/1086H01M8/1088
CPCH01M8/1088H01M8/1023H01M8/1086Y02E60/50
Inventor 郝金凯张洪杰邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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