Polymeric electrolytic cell separator membrane and method of...

H - Electricity – 01 – M

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H01M 2/16 (2006.01) B29C 71/00 (2006.01) C08J 9/28 (2006.01) H01M 6/18 (2006.01) H01M 6/32 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2168433

A flexible polymeric film useful as an interelectrode separator or electrolyte member (45) in electrolytic devices, such as rechargeable batteries, comprises a copolymer of vinylidene fluoride with 8 to 25 % hexafluoropropylene. The film may be cast or formed as a self-supporting layer retaining about 20 to 70 % of a high-boiling solvent or solvent mixture plasticizer comprising such compounds as ethylene carbonate, propylene carbonate, dimethyl carbonate, and dibutyl phthalate. The film may be used in such form or after leaching of the retained plasticizer with a film-inert low-boiling solvent to provide a separator member into which a solution of electrolytic salt is subsequently imbibed to displace retained plasticizer or replace plasticizer previously leached from the polymeric matrix.

Film polymère flexible utilisable comme séparation entre des électrodes ou comme élément d'électrolyte (45) dans des dispositifs électrolytiques tels que des batteries rechargeables. Ledit film se compose d'un copolymère de fluorure de vinylidène avec 8 à 25 % d'hexafluoropropylène. Il peut être coulé ou formé de façon à constituer une couche indépendante qui retient environ 20 à 70 % d'un plastifiant dont le solvant ou mélange de solvant a un point d'ébullition élevé, comportant des composés tels que du carbonate d'éthylène, du carbonate de propylène, du carbonate de diméthyle et du phtalate de dibutyle. Ce film peut être utilisé sous cette forme ou après la lixiviation du plastifiant retenu avec un solvant à point d'ébullition bas inerte pour le film, de façon à créer un élément séparateur qui est ensuite imbibé d'une solution de sel électrolytique, afin de déplacer le plastifiant retenu ou de remplacer le plastifiant qui a été auparavant éliminé par lixiviation de la matrice du polymère.

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