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High-temperature proton exchange membrane and preparation method thereof

A technology of proton exchange membrane and high temperature, applied in the direction of fuel cells, electrochemical generators, electrical components, etc. The adsorption capacity of the basement membrane is not strong, etc., to achieve the effect of low raw material prices, low requirements for equipment and reaction conditions, and high-temperature proton conductivity

Active Publication Date: 2018-10-12
福建永同丰超低能耗建筑研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Nafion membrane produced by DuPont of the United States is currently the most widely used high-performance proton exchange membrane, but this membrane can only be used under low temperature and humidity conditions, and the actual working environment of fuel cells often exceeds 80 ° C. Above this temperature At this time, the water adsorbed and retained in the membrane will volatilize, thereby reducing the proton conductivity, making the fuel cell unstable and shortening the cycle life.
In addition, this membrane mainly relies on imports and is expensive. These shortcomings hinder the wide application and further development of proton exchange membrane fuel cells in new energy vehicles and other devices or other industries.
[0004] In the prior art, proton exchange membranes that can work stably at high temperatures are usually prepared by adding proton-conducting media such as phosphoric acid or ionic liquids to polymer-based membranes. However, due to the weak adsorption capacity of the polymer base membrane, the binding ability of the proton-conducting media such as phosphoric acid or ionic liquid is weak, and the proton-conducting media such as phosphoric acid or ionic liquid cannot be well retained. The energy efficiency of the battery is low, the service life is reduced, and there are even hidden dangers of causing safety accidents

Method used

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  • High-temperature proton exchange membrane and preparation method thereof

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Embodiment 1

[0030] A method for preparing a high-temperature proton exchange membrane, comprising the steps of:

[0031] 1) Preparation of bishydroxyethyl sulfone-4,5-dicarboxyimidazole polycondensate: dissolve 10 g of bishydroxyethyl sulfone, 10 g of 4,5-dicarboxyimidazole, and 3 g of zirconium sulfate in 50 g of toluene, and add In a round-bottomed flask with a water separator, stir the reaction at 80°C for 2 hours under a nitrogen atmosphere, and 6 hours at a temperature of 110°C, then remove the solvent by rotary evaporation, and wash the product with water for 3 times, then wash with ethyl acetate Wash 4 times, and finally place it in a vacuum drying oven at 80°C for 10 hours;

[0032] 2) Modification of the polycondensate: dissolve 12 g of the polycondensate prepared in step 1), 4 g of 2-chloroethyl methanesulfonic acid, and 4 g of sodium cyanide in 40 g of dimethyl sulfoxide, and stir the reaction at 70° C. 4 hours, then settle out in water, wash 5 times with water, and dry in a v...

Embodiment 2

[0038] A method for preparing a high-temperature proton exchange membrane, comprising the steps of:

[0039] 1) Preparation of bishydroxyethyl sulfone-4,5-dicarboxyimidazole polycondensate: dissolve 10 g of bishydroxyethyl sulfone, 10 g of 4,5-dicarboxyimidazole, and 4 g of cerium sulfate in 60 g of toluene, and add In a round-bottomed flask with a water separator, stir the reaction at 83°C for 2.2 hours under a helium atmosphere, and stir the reaction at a temperature of 115°C for 6.5 hours. After that, the solvent is removed by rotary evaporation, and the product is washed with water for 4 times, and then washed with ethyl acetate The ester was washed 5 times, and finally placed in a vacuum oven at 83°C for 11 hours;

[0040] 2) Modification of polycondensate: dissolve 14 g of polycondensate prepared in step 1), 4 g of 2-chloroethyl methylsulfonic acid, and 5 g of potassium tert-butyl alkoxide in 45 g of N,N-dimethylformamide , stirred and reacted at 72°C for 4.5 hours, the...

Embodiment 3

[0046] A method for preparing a high-temperature proton exchange membrane, comprising the steps of:

[0047] 1) Preparation of bishydroxyethyl sulfone-4,5-dicarboxyimidazole polycondensate: 10 g of bishydroxyethyl sulfone, 10 g of 4,5-dicarboxyimidazole, and 5 g of tetrabutyl titanate were dissolved in 75 g of toluene, and Add it into a round-bottomed flask with a water separator, stir and react at 85°C for 2.5 hours under a neon gas atmosphere, and stir for 7 hours at a temperature of 120°C, then remove the solvent by rotary evaporation, and wash the product with water 4 times, and then Washed 6 times with ethyl acetate, and finally placed in a vacuum oven at 85°C for 12 hours;

[0048] 2) Modification of the polycondensate: dissolve 16 g of the polycondensate prepared in step 1), 4 g of 2-chloroethyl methylsulfonic acid, and 6 g of potassium hydroxide in 50 g of N-methylpyrrolidone, and stir at 75° C. Reacted for 5 hours, then precipitated in water, washed 6 times with wate...

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Abstract

The invention provides a preparation method of a high-temperature proton exchange membrane. The preparation method comprises the following steps of 1) preparing a bis-hydroxyethyl sulfone-4, 5-dicarboxyl imidazole polycondensate; 2) performing modification on the polycondensate; 3) carrying out casting and film forming; and 4) performing phosphoric acid doping. The invention also discloses the high-temperature proton exchange membrane prepared by the preparation method, and a proton exchange membrane fuel cell which takes the high-temperature proton exchange membrane as a polyelectrolyte membrane. Compared with the high-temperature proton exchange membrane in the prior art, the high-temperature proton exchange membrane prepared in the invention has higher proton conductivity, lower cost, lower methyl alcohol permeability, higher mechanical property, higher stability and high temperature resistance performance, and higher safety and environmental protection property in use.

Description

technical field [0001] The invention belongs to the technical field of polyelectrolyte materials, and relates to a fuel cell component, in particular to a high-temperature proton exchange membrane and a preparation method thereof. Background technique [0002] In recent years, environmental issues and energy issues are still the main factors restricting social and economic development. In order to solve this problem, various clean new energy devices have sprung up like mushrooms after rain. With the gradual commercialization and popularization of new energy vehicles, as one of the clean energy devices in the new era, the fuel cell, which can improve the power source for new energy vehicles, has become a research and development hotspot in the industry. A fuel cell is an energy device that can directly convert chemical energy into electrical energy. It has the advantages of fast start-up, long duration, high specific power and specific energy, and environmental protection. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1069H01M8/1048H01M8/1051
CPCH01M8/1048H01M8/1051H01M8/1069H01M2008/1095Y02E60/50
Inventor 不公告发明人
Owner 福建永同丰超低能耗建筑研究院有限公司
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