Hydrocarbon type polymer electrolyte, membrane/electrode assembly, and fuel cell power source

A technology of electrolyte and polymer electrolyte, which is applied in the field of electrolyte, electrolyte membrane, membrane electrode assembly using it, fuel cell power supply and fuel cell power supply system, and can solve the problems of reduced ion conductivity and achieve low cost and high durability Excellent performance in resistance to oxidation and deterioration

Inactive Publication Date: 2008-02-06
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent Documents 5 and 6 propose that since the ion-conductive group is introduced into the nitrogen atom of the imidazole ring, the amount of the introduced alkylenesulfonic acid group is limited, and the ion conductivity is still 0.07 S / cm even at a high temperature of 80°C. Below, when used in methanol direct fuel cells that operate at relatively low temperatures and solid polymer fuel cells for mobile objects that are used at high current densities, ion conductivity decreases

Method used

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  • Hydrocarbon type polymer electrolyte, membrane/electrode assembly, and fuel cell power source
  • Hydrocarbon type polymer electrolyte, membrane/electrode assembly, and fuel cell power source
  • Hydrocarbon type polymer electrolyte, membrane/electrode assembly, and fuel cell power source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] (1) Synthesis of polyhydroxybenzimidazoles

[0120] In a three-necked flask with a stirring mixer and a nitrogen introduction tube, put 8.035g (37.5mmol) of 3,3',4,4'-tetraaminobiphenyl and 13.137g (37.5mmol) of 2,5-dihydroxy Diphenyl isophthalate was dissolved in 200ml of sulfolane, and nitrogen was passed through for deoxygenation. After heating to reflux under a nitrogen stream for 96 hours, and cooling at room temperature, a mixed solution of 1 liter of methanol and 0.5 liter of acetone was added. The precipitated polymer was filtered, washed with distilled water and acetone, and dried to obtain a polyhydroxybenzimidazole containing a structural unit represented by Chemical Formula 20.

[0121] ...Chemical Formula 20

[0122] (2) Synthesis of Polysulfobutoxybenzimidazole

[0123] Put 10.6 g of the polyhydroxybenzimidazole of the above chemical formula 20 and 87 g of N-methyl-pyrrolidone, and dissolve while blowing nitrogen gas. To this solution, 10 g of an eth...

Embodiment 2

[0140] (1) Synthesis of Polysulfomethylbenzimidazole

[0141] In a three-necked flask with a stirring mixer and a nitrogen introduction tube, add 8.035g (37.5mmol) of 3,3',4,4'-tetraaminobiphenyl and 10.17g (37.5mmol) of 2,5-dicarboxy - 1,4-sulfomethylbenzene monosodium salt, 110g of polyphosphoric acid (phosphorus pentoxide content 75%), 87.9g of phosphorus pentoxide. Slowly raise the temperature to 100°C while blowing nitrogen gas. After maintaining at 100° C. for 1.5 hours, the temperature was raised to 150° C. and maintained at 150° C. for 1 hour. Then, the temperature was raised to 200° C. and kept at 200° C. for 4 hours. After cooling to room temperature, add water, take out the content, pulverize it with a mixer, and wash the filtrate repeatedly to make it neutral by pH test paper. The obtained polymer was dried under reduced pressure to obtain polysulfomethylbenzimidazole containing a structural unit represented by Chemical Formula 23.

[0142] ...Chemical formul...

Embodiment 3

[0155] (1) Synthesis of polyhydroxybenzimidazoles

[0156]In a three-necked flask with a stirring mixer and a nitrogen introduction tube, add 5.175g (37.5mmol) of 3,3',4,4'-tetraaminobenzene and 13.137g (37.5mmol) of 2,5-dihydroxy Diphenyl phthalate was dissolved in 200ml of sulfolane, and deoxygenated while flowing nitrogen. Maturation and reflux were carried out under nitrogen flow for 96 hours. After cooling at room temperature, a mixed solution of 1 liter of methanol and 0.5 liter of acetone was added. After the precipitate was filtered, washed with distilled water and acetone, and dried, the polyhydroxybenzimidazole containing the structural unit represented by chemical formula 25 was obtained.

[0157] ...Chemical formula 25

[0158] (2) Synthesis of polysulfopropoxy benzimidazole

[0159] 8.23 g of polyhydroxybenzimidazole containing the structural unit represented by the above chemical formula 25 and 87 g of N-methyl-pyrrolidone were put in and dissolved while blo...

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Abstract

An alkylenesulfonic group and / or an alkylenesulfo-ether group is introduced as an ionic conductivity-imparting group into a polyazole such as a polyimidazole, a polyoxazole, or a polythiazole each having good resistance to oxidation. The resulting polymer yields an electrolyte, an electrolyte membrane, and a membrane electrode assembly which are available at low cost, contains ionic conductivity-imparting groups stable over extended periods of time and satisfactorily resistant to oxidative degradation. This enables long-term continuous use of mobile cell power sources, dispersed cell power sources, and cell power sources for mobile units.

Description

[0001] 【Technical field】 [0002] The present invention relates to fuel cells that use hydrogen or methanol as fuel, water electrolysis, halogen acid electrolysis, salt electrolysis, oxygen concentrators, humidity sensors, electrolyte membranes used in gas sensors, etc., especially methanol directly The most suitable for fuel cells, low-cost, high-durability solid polymer electrolyte with excellent oxidation resistance, solid polymer electrolyte membrane using it, electrode catalyst coating solution, membrane / electrode assembly, fuel cell, and Fuel cell power system. 【Background technique】 [0003] Solid polymer electrolytes are solid polymer materials with electrolyte groups such as sulfonic acid groups, alkylene sulfonic acid groups, phosphonic acid groups, and alkylene phosphonic acid groups in the polymer chain. Due to the firm combination with specific ions, or It has the property of selectively permeating cations or anions, so it is shaped into particles, fibers, or fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/32C08G73/18C08J5/18H01M8/02
CPCH01M8/1067H01M8/1027H01M4/926H01M8/103Y02E60/523H01M2300/0082H01M8/1039H01M8/1032H01M4/8828Y02E60/50
Inventor 小山彻森岛慎相马宪一
Owner HITACHI LTD
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