Electrochemical cell with a polymer electrolyte and process...

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H01M 8/10 (2006.01) C08J 5/22 (2006.01) C25B 9/00 (2006.01) C25B 9/08 (2006.01) H01M 2/16 (2006.01) H01M 4/94 (2006.01)

Patent

CA 2148592

28 Abstract The electrochemical cell comprises a pair of electrodes (2a, 2b) whose electrode body (3a, 3b) consists of po- rous base material with a catalyst deposited on carbon particles. Between the electrodes, a membrane film (4) made of a hydrophillic, proton-conducting polymer mate- rial is arranged which acts as electrolyte and separator. The material of the membrane film (4) is a base polymer which is radiation-grafted with terminally sulphonated vinyl radicals and is selected from the group formed by substituted and unsubstituted polyolefins, substituted and unsubstituted vinyl polymers and their copolymers, the vinyl radicals being derived from vinyl monomers which are selected from the group formed by substituted and unsubstituted vinyl monomers. Between the membrane film and the base material with the catalyst deposited thereon an interlayer is provided which comprises a proton-conducting hydrophillic copolymer of poly(perfluoroalkylene) which is substituted with ion-exchanging groups, and poly(perfluoroalkylene) which is substituted with non- ion-exchanging groups. (Fig. 1)

La cellule électrochimique présentée comprend une paire d'électrodes (2a, 2b), dont les corps respectifs (3a, 3b) sont constitués par un support poreux comportant un catalyseur déposé sur des particules de carbone. Un film-membrane (4) en un matériau polymère hydrophile, conducteur protonique, agissant comme électrolyte et séparateur, est disposé entre les électrodes. Le matériau constituant le film-membrane (4) est un polymère de base greffé par rayonnement, doté de restes vinyle sulfonés en fin de chaîne, choisi dans le groupe comprenant des polyoléfines substituées et non substituées, des polymères de vinyle et leurs copolymères, substitués et non substitués, les restes vinyle étant dérivés de monomères de vinyle qui sont choisis dans le groupe comprenant des monomères de vinyle substitués et non substitués. Il est prévu, entre le film-membrane et le support sur lequel le catalyseur a été déposé, une couche intermédiaire constituée par un copolymère hydrophile, conducteur protonique, de poly(perfluoroalkylène) substitué par des groupes échangeurs d'ions, et de poly(perfluoroalkylène) substitué par des groupes non échangeurs d'ions.

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