Method of making multi-layer electrochemical cell devices

H - Electricity – 01 – M

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H01M 2/16 (2006.01) H01M 4/04 (2006.01) H01M 10/50 (2006.01)

Patent

CA 2391990

A method of making a laminated multi-layer electrochemical cell device structure comprising positive and negative electrode layer members (12, 18) of a polymeric matrix composition, having a microporous polyolefin membrane separator member (16) therebetween, wherein the membrane includes a polymer coating layer. The separator is treated to provide a coating of a plasticizer for the polymer coating layer. The electrode and separator members are then assembled and laminated at a compressive force and temperature at which the pasticizer film softens the polymer coating of the separator member to sufficiently establish a strong interfacial bond with the matrix polymers of the electrode members, and thereby form a unitary cell structure. Alternatively, the plasticizer is a component of the electrode polymer matrix composition. In either embodiment, the plasticizer subsequently volatilizes from the structure to further strengthen the interfacial bond.

L'invention concerne un procédé de production d'une structure de dispositif de pile électrochimique multicouche stratifiée comprenant des éléments de couches d'électrodes positive et négative (12, 18) d'une composition de matrice polymère, entre lesquels se trouve un élément séparateur (16) à membrane polyoléfinique microporeuse, la membrane contenant une couche de revêtement polymère. Le séparateur est traité pour produire un revêtement d'un plastifiant pour la couche de revêtement polymère. Les éléments d'électrodes et séparateur sont ensuite assemblés et stratifiés sous une force de compression et une température auxquelles la couche mince de plastifiant assouplit le revêtement polymère de l'élément séparateur pour établir une liaison interfaciale forte suffisante avec les polymères matriciels des éléments d'électrode, et former ainsi une structure de pile unitaire. Dans un autre mode de réalisation, le plastifiant est un constituant de la composition matricielle polymère d'électrode. Dans un autre mode de réalisation, le plastifiant s'évapore ensuite à partir de la structure pour renforcer davantage la liaison interfaciale.

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