Sealing material for fuel cell

H - Electricity – 01 – M

Patent

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Details

H01M 8/02 (2006.01) C08L 83/04 (2006.01) C09K 3/10 (2006.01) H01M 2/08 (2006.01)

Patent

CA 2328615

A liquid resin composition (26) comprising A) an addition-polymerizable oligomer which has, as the backbone thereof, a linear polyisobutylene or perfluoropolyether structure and has an alkenyl group at least at each end, B) a hardener containing, in its molecule thereof, at least two hydrogen atoms each bonded to a silicon atom, and C) a hydrosilylation catalyst is three-dimensionally crosslinked to form a sealing layer in a unit cell (20) of a fuel cell assembly to thereby seal separators (24) and (25), a pair of electrodes (22) and (23), and an -ion-exchange resin (21) as a solid electrolyte. Thus, each cell can be reduced in thickness and size to enable the fuel cell assembly to have a high output.

L'invention concerne une composition (26) de résine comprenant (A) un oligomère polymérisable par addition dont la chaîne principale présente une structure polyisobutylène ou perfluoropolyéther linéaire et possède au moins un groupe alcényle à chaque bout, (B) un durcisseur contenant au moins deux atomes d'hydrogène par molécule, ces atomes étant liés chacun à un atome de silicium, et (C) un catalyseur d'hydrosilylation. Cette composition est réticulée de manière tridimensionnelle afin de former une couche d'étanchéité dans chaque élément (20) d'un ensemble pile à combustible et de sceller les séparations (24) et (25), les deux électrodes (22) et (23), et une résine (21) échangeuse d'ions formant un électrolyte solide. On peut ainsi réduire l'épaisseur et la dimension de chaque élément et obtenir un ensemble pile à combustible présentant une puissance élevée.

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