Electrolyte membrane for solid polymer fuel cell, method for...

H - Electricity – 01 – M

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H01M 8/02 (2006.01) C08J 5/22 (2006.01) C08L 27/12 (2006.01) H01B 1/06 (2006.01) H01B 13/00 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2571138

An electrolyte membrane containing cerium ions and composed of a cation- exchange membrane which is made of a polymer compound having a cation-exchange group is used as an electrolyte membrane for solid polymer fuel cells. When the cation-exchange membrane has sulfonic acid groups, cerium ions are preferably contained in an amount of 0.3-20% relative to the -SO3- groups contained in the cation-exchange membrane, and for example, the sulfonic acid groups are ion exchanged with the cerium ions. Consequently, there can be provided an electrolyte membrane for solid polymer fuel cells which enables to generate electricity at high energy efficiency and exhibits high power generation performance regardless of the dew point of a supply gas. This electrolyte membrane for solid polymer fuel cells also enables to stably generate electricity for a long time.

Cette invention a pour objet une membrane électrolyte contenant des ions cérium et étant composée d~une membrane conductrice de cations formée d~un composé polymérique doté d~un groupe d~échange cationique. Cette membrane est utilisée comme une membrane polyélectrolyte solide pour piles à combustible. Lorsque la membrane conductrice de cations possède des groupes d~acide sulfonique, la teneur en ions cérium est, de préférence, de 0.3 à 20% des groupes d~anhydride sulfurique contenus dans la membrane conductrice de cations, et, par exemple, les groupes d~acide sulfonique subissent des échanges d~ions avec des ions cérium. Par conséquent, il est possible de fournir une membrane polyélectrolyte solide pour piles à combustible permettant de générer de l~électricité à haute efficacité énergétique et de témoigner d~une performance de génération de grande puissance quel que soit le point de rosée du gaz fourni. Cette membrane polyélectrolyte solide pour piles à combustion permet également de générer de l~électricité de manière stable sur une longue durée.

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