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Preparation process 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 composite membrane penetration and leakage, battery performance degradation, and low proton conductivity, so as to increase hydrophilicity and improve performance , smooth surface effect

Active Publication Date: 2021-04-02
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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  • Preparation process of composite membrane for fuel cell
  • Preparation process 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 takes an expansion body polytetrafluoroethylene microporous base membrane as a skeleton, and is subjected to dipping treatment of mixed liquids with different concentrations from low to high, specifically, a treatment tank I is loaded with mixed liquid of perfluorosulfonic acid resin liquid with the concentration of 0.1 wt%-1wt%, a water-retaining agent and a free radical quenching agent; a mixed solution of perfluorosulfonic acid resin liquid with the concentration of 2wt%-6wt%, a water-retaining agent and a free radical quenching agent is contained in a treatment tank II; and a mixed solution of perfluorosulfonic acid resin liquid with the concentration of 7wt%-20wt% and sulfonated polyetheretherketone is contained in a treatment tank III. The proton exchange composite membrane prepared by the process provided by the invention does not generate pore residues, avoids hydrogenpermeation in the use process, and can meet the requirements of mechanical strength, dimensional stability and excellent electrochemical performance at the same time.

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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IPC IPC(8): H01M8/1023H01M8/1086H01M8/1088
CPCH01M8/1088H01M8/1023H01M8/1086Y02E60/50H01M2008/1095H01M8/1067H01M8/1039H01M8/1081H01M8/109H01M2300/0082
Inventor 郝金凯张洪杰邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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