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High interface compatibility sulphonation medlin proton exchange film for fuel battery and preparation method thereof

A technology of sulfonated polyimide and proton exchange membrane, which can be used in fuel cell parts, fuel cells, solid electrolyte fuel cells, etc., and can solve the problems of poor interface compatibility and affecting the working stability of proton exchange membrane.

Inactive Publication Date: 2009-05-27
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the performance of the single membrane has been improved, when these proton exchange membranes are assembled into a fuel cell stack, the poor interface compatibility with the electrode and high temperature swelling affect the working stability of the proton exchange membrane.

Method used

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  • High interface compatibility sulphonation medlin proton exchange film for fuel battery and preparation method thereof
  • High interface compatibility sulphonation medlin proton exchange film for fuel battery and preparation method thereof
  • High interface compatibility sulphonation medlin proton exchange film for fuel battery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0031] (a) Dissolve 41g (0.1mol) of 3,3'-disulfonic acid-4,4'-dihydroxydiphenyl sulfone and 27.2g (0.2mol) of 2-fluoro-6-aminobenzonitrile in 100gN at room temperature -In a mixed solvent of methyl-2-pyrrolidone, 150g toluene, 4g sodium hydroxide and 10g deionized water, under nitrogen atmosphere, heat up to 160°C, react for 4 hours, then rise to 190°C for 16 hours, react After the end, cool the reaction product to room temperature, filter it with a Buchner funnel, pour the filtrate into 200g of absolute ethanol solvent, and stir rapidly at the same time to form a precipitate. After suction filtration, put the filter cake in 80°C deionized water Heated and stirred for 3 hours, and then suction filtered to obtain 52 g of amino-terminated nitrile-containing sulfonated aromatic ring polymers, with a yield of 81%;

[0032] (b) 6.42g (10mmol) of amino-terminated nitrile-containing sulfonated aromatic ring polymers and 2.4g of triethylamine are dissolved in 80g of m-cresol at room t...

Embodiment 1

[0038] The thickness of the proton exchange membrane prepared in Example 1 is 73 microns, the ion exchange capacity is 1.90mmol / g, the conductivity is 0.087S / cm (20°C, 100% relative humidity), and the methanol permeability is 1.2×10 -6 cm 2 / s, such as figure 2 , image 3 , Figure 4 shown.

preparation Embodiment 2

[0040] (a) Mix 49.6g (0.1mol) 3,3'-disulfonic acid-4,4'-dihydroxyphenylhexafluoropropane and 27.2g (0.2mol) 2-fluoro-6-aminobenzonitrile at room temperature Dissolve it in a mixed solvent of 100g N,N'-dimethylacetamide, 150g toluene, 6g potassium carbonate and 10g deionized water, raise the temperature to 160°C under nitrogen atmosphere, react for 4 hours, then rise to 190°C for reaction After 16 hours, after the reaction was over, the reaction product was cooled to room temperature, and after suction filtration with a Buchner funnel, the filtrate was poured into 200g of absolute ethanol solvent, while stirring rapidly to generate a precipitate, and after suction filtration, the filter cake was placed in 80 ℃ in deionized water, heated and stirred for 3 hours, and then suction-filtered to obtain 55.3 g of amino-terminated nitrile-containing sulfonated aromatic ring polymers, with a yield of 76%;

[0041] (b) 7.28g (10mmol) of amino-terminated nitrile-containing sulfonated arom...

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Abstract

The invention discloses a high interfacial compatibility sulfonated polyimide proton-exchange membrane for a fuel battery and a preparation method thereof. The thickness of the proton-exchange membrane is between 10 and 100 micrometers; the ion exchange capacity is between 1 and 3 mmol / g; the proton conductivity at 20 DEG C and with the relative humidity of 100 percent is between 1 and 10*10<-3> S / cm; and the methanol permeability is between (0.2-3)*10<-6> cm<2> / s. The invention introduces a nitrile group into a diamine monomer which synthesizes sulfonated polyimide through condensation reaction, so as to increase the content of a nitrile group in a backbone structure, reduce the water content and the high-temperature swelling capacity of the proton-exchange membrane, strengthen the interfacial compatibility between the proton-exchange membrane and an electrode, reduce the contact resistance, and improve the electrical conductivity of the membrane. The invention improves the chemical stability of the proton-exchange membrane and realizes long-term working stability of the proton-exchange membrane.

Description

technical field [0001] The invention relates to a polymer material membrane and a preparation method thereof, in particular to a high interfacial compatibility sulfonated polyimide proton exchange membrane for fuel cells and a preparation method thereof. Background technique [0002] The proton exchange membrane used in direct methanol fuel cells not only needs to have high proton conductivity, but also needs to have low methanol permeability. Although the Nafion membrane produced by DuPont is recognized as a high-performance proton exchange membrane in the industry, under the application conditions of direct methanol fuel cells, the high methanol permeability directly leads to the reduction of fuel cell efficiency, which seriously hinders its commercialization process. . Therefore, many scientific researchers have invested a lot of energy to develop new membrane materials, and synthesized a batch of sulfonated proton exchange membranes with aromatic structure. These proton...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/10H01M2/16C08J5/22C08L79/08C08G73/10H01M8/1039H01M8/1072
CPCY02E60/12Y02E60/522Y02E60/523Y02E60/50
Inventor 韩生高峰吴锡慧石勇
Owner SHANGHAI INST OF TECH
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