Fuel cell incorporating novel ion-conducting membrane

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 5/22 (2006.01) C08F 8/36 (2006.01) H01M 2/16 (2006.01) H01M 8/02 (2006.01) H01M 8/10 (2006.01) G02F 1/15 (2006.01) H01M 8/18 (2006.01)

Patent

CA 2190848

Fuel cells incorporating a novel ion-conducting membrane are disclosed. The membrane (1) comprises a plurality of acid-stable polymer molecules each having at least one ion-conducting component covalently bonded to at least one flexible connecting component. The membrane has ion-conducting components of the polymer molecules ordered such that a plurality of continuous ion-conducting channels (2) penetrate the membrane from a first face to a second face and such that the ion-conducting channels are situated in an elastic matrix (3) formed by the flexible connecting components. A preferred membrane is obtained by (a) sulfonating SEBS with sulfur trioxide under conditions that result in greater than 25 mol % sulfonation and (b) heating the polymer.

L'invention concerne des piles à combustible comprenant une nouvelle membrane conductrice d'ions. La membrane (1) comprend une pluralité de molécules de polymère stables dans l'acide, ayant chacune au moins un composant conducteur d'ions, lié par covalence à au moins un composant de raccordement flexible. La membrane comporte des composants conducteurs d'ions des molécules de polymère, ordonnés de telle sorte qu'une pluralité de canaux conducteurs d'ions continus (2) pénètrent dans la membrane depuis une première face jusqu'à une deuxième face et de telle sorte que les canaux conducteurs d'ions soient situés dans une matrice élastique (3) formée par les composants de raccordement flexible. On obtient une membrane préférée en (a) sulfonant du SEBS avec du trioxyde de souffre dans des conditions donnant une sulfonation de plus de 25 % en mol. et en (b) chauffant le polymère.

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