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Fuel cell diaphragm with good alkali resistance and high strength

A fuel cell, high-strength technology, used in fuel cells, circuits, electrical components, etc., can solve problems such as environmental protection and human health hazards, reduced battery energy conversion efficiency, and reduced proton conductivity, achieving excellent overall performance, improving Chemical stability and less device-dependent effects

Inactive Publication Date: 2020-11-17
HUNAN CHENLI NEW MATERIAL CO LTD
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Problems solved by technology

[0005] At present, the common fuel cell membrane is the perfluorosulfonic acid membrane represented by the Nafion membrane produced by DuPont Company of the United States. This membrane has high proton conductivity and excellent chemical stability, but because it is mainly imported, It is expensive, and its application range is usually below 80°C. It is easy to dehydrate in a high temperature environment. Dehydration leads to an increase in membrane resistance and a rapid decline in its proton conductivity, which in turn reduces the energy conversion efficiency of the battery.
The polymer anion exchange membrane developed in recent years can be used at high temperature, but it must go through the process of chloromethylation when introducing ion exchange groups, and the highly toxic carcinogen chlorine is used in the process of chloromethylation. Methyl ether, which is a major hazard to environmental protection and human health, and the thermal stability, chemical stability and strong alkali resistance of the anion-exchange membrane fuel cell diaphragm in the prior art need to be further improved
[0006] The Chinese invention patent with the application number 201610462433.8 discloses a preparation method of a fuel cell diaphragm. The preparation method uses radiation-induced free radical polymerization to introduce adamantyl triazine ion-exchange groups, and uses adamantane as an electron-donating group. group, which is conducive to improving the alkali resistance and chemical stability of triazine ionic liquids; double bond modified titanium dioxide is used as a crosslinking agent to ensure high ion conductivity and improve the alkali resistance and mechanical properties of the separator , water absorption, methanol permeability resistance and chemical stability of the membrane; however, due to the large steric hindrance effect of adamantane and triazine, the product yield of this membrane is low, and the price of raw materials is high. Insufficient toughness, not suitable for industrial production

Method used

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Examples

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Embodiment 1

[0028] A method for preparing a fuel cell membrane, characterized in that it comprises the steps of:

[0029] Step S1, preparation of poly 2,5-piperidinedicarboxylic acid 4,4-diaminodiphenylsulfide amide: 10 g of 2,5-piperidinedicarboxylic acid, 12.4 g of 4,4-diaminodiphenylsulfide g, 4 g of phosphonothioate were added to 60 g of dimethyl sulfoxide, stirred for 40 minutes to obtain a mixed material, then the mixed material was transferred to an autoclave, and the air in the autoclave was replaced with nitrogen, and the temperature in the autoclave was maintained At 230°C, the pressure was kept at 1MPa, stirred and reacted for 3h, and then slowly exhausted and depressurized to 0.5MPa within 1 hour. Control the temperature between 225°C, stir and react for 8 hours. After the reaction, cool to room temperature, precipitate in water, and wash the precipitated polymer with ethanol for 3 times, and finally take it out and dry it in a blast drying oven at 80°C To constant weight, po...

Embodiment 2

[0035] A method for preparing a fuel cell membrane, characterized in that it comprises the steps of:

[0036] Step S1, preparation of poly 2,5-piperidinedicarboxylic acid 4,4-diaminodiphenylsulfide amide: 10 g of 2,5-piperidinedicarboxylic acid, 12.4 g of 4,4-diaminodiphenylsulfide g. Add 4.5 g of phosphorous acid to 75 g of N,N-dimethylformamide, stir for 45 minutes to obtain a mixed material, then transfer the mixed material to a high-pressure reactor, replace the air in the tank with helium, and put the high-pressure reaction Keep the temperature in the autoclave at 235°C and the pressure at 1.2MPa, stir and react for 3.5 hours, then slowly exhaust and reduce the pressure to 0.6MPa within 1.2 hours, and at the same time raise the temperature in the autoclave to 275°C, and stir for 0.6 hours. Finally, under vacuum conditions, control the temperature between 227 ° C, stir the reaction for 9 hours, after the reaction, cool to room temperature, precipitate in water, and wash th...

Embodiment 3

[0042] A method for preparing a fuel cell membrane, characterized in that it comprises the steps of:

[0043] Step S1, preparation of poly 2,5-piperidinedicarboxylic acid 4,4-diaminodiphenylsulfide amide: 10 g of 2,5-piperidinedicarboxylic acid, 12.4 g of 4,4-diaminodiphenylsulfide g, 5 g of thiophosphoramide were added to 80 g of N,N-dimethylacetamide, stirred for 50 minutes to obtain a mixed material, then the mixed material was transferred to an autoclave, and the air in the autoclave was replaced with neon gas, and the autoclaved The temperature in the reactor was kept at 240°C, the pressure was kept at 1.5MPa, and the reaction was stirred for 4 hours, and then slowly exhausted and depressurized to 0.65MPa within 1.5 hours. At the same time, the temperature in the high-pressure reactor was raised to 280°C, and the reaction was stirred for 0.8 hours. Finally, under vacuum conditions, control the temperature between 230°C and stir the reaction for 10 hours. After the reactio...

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Abstract

The invention discloses a fuel cell diaphragm with good alkali resistance and high strength. A preparation method of the fuel cell diaphragm comprises the following steps: S1, preparing poly 2, 5-piperidine dicarboxylic acid 4, 4-diaminodiphenyl sulfide amide; S2, preparing glucoside modified poly 2, 5-piperidine dicarboxylic acid 4, 4-diaminodiphenyl sulfide amide; and S3, exchanging ions. The fuel cell diaphragm disclosed by the invention is excellent in comprehensive performance, high in ionic conductivity and excellent in alkali resistance, chemical stability resistance and mechanical property.

Description

[0001] This invention is a Chinese patent "a fuel cell separator and its preparation method". The application date is October 24, 2019, and the application number is 201911014743.3. technical field [0002] The invention belongs to the technical field of fuel cells, and relates to a fuel cell component, in particular to a fuel cell diaphragm with good alkali resistance and high strength. Background technique [0003] In recent years, with the increasingly tense supply of non-renewable resources such as oil and gas and the deepening of human understanding of environmental pollution, energy crisis and other issues, in order to meet the requirements of the development model of "low-carbon economy" and "energy saving and emission reduction", people The development of renewable clean energy is getting more and more attention. As a common clean energy device, fuel cells have attracted widespread attention. Fuel cell is a device that directly converts chemical energy in fuel into ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0221H01M8/0228C08G69/48C08G69/42
CPCC08G69/42C08G69/48H01M8/0221H01M8/0228Y02E60/50
Inventor 万章文曹冰
Owner HUNAN CHENLI NEW MATERIAL CO LTD
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