Composite polymer electrolyte for a rechargeable lithium...

H - Electricity – 01 – M

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H01M 2/16 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2321431

The composite electrolyte for use in a thin plate rechargeable lithium battery comprises a porous or microporous inert polymer separator laminate which carries another porous polymer containing a dissociable lithium compound, and the adherent polymer layers are impregnated with an organic liquid containing a lithium salt. The porous or microporous separator laminate may be a single polymer layer or a multiple polymer layer. The composite electrolyte is inserted between the electrodes of a rechargeable lithium battery. In another embodiment the porous polymer separator sheet has an adherent dissociable lithium compound containing polymer layer on each of its major faces.

L'invention concerne un électrolyte composite destiné à être utilisé dans une pile au lithium rechargeable plate. L'électrolyte comprend un séparateur feuilleté, constitué d'un polymère inerte poreux ou microporeux, qui porte un autre polymère poreux contenant un composé de lithium dissociable. Les couches de polymères adhérentes sont imprégnées d'un liquide organique contenant un sel de lithium. La feuille du séparateur poreux ou microporeux peut être constituée d'une seule couche de polymère ou de plusieurs couches de polymère. L'électrolyte composite est inséré entre les électrodes d'une pile au lithium rechargeable. Dans un autre mode de réalisation, la feuille du séparateur comporte une couche polymère portant, sur chacune de ses faces principales, une couche polymère adhérente contenant un composé de lithium dissociable.

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