Conductive polymeric compositions for lithium batteries

C - Chemistry – Metallurgy – 08 – G

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C08G 79/08 (2006.01) C08G 65/32 (2006.01) C08G 65/328 (2006.01) C08G 79/10 (2006.01) H01M 2/38 (2006.01) H01M 10/44 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2412818

Novel chain polymers comprising weakly basic anionic moieties chemically bound into a polyether backbone at controllable anionic separations are presented. Preferred polymers comprise orthoborate anions capped with dibasic acid residues. preferably oxalato or malonato acid residues. The conductivity of these polymers is found to he high relative to that of most conven- tional salt-in-polymer electrolytes. The conductivity at high temperatures and wide electrochemical window make these materials especially suitable as electrolytes for rechargeable lithium batteries.

L'invention concerne des nouveaux polymères en chaîne comprenant des fragments anioniques faiblement basiques liés par voie chimique dans un squelette de polyéther au niveau de séparations anioniques contrôlables. Parmi les polymères préférés figurent des anions d'orthoborate coiffés par des résidus de diacide, de préférence par des résidus d'acide oxalato ou malonato. On a découvert que la conductivité de ces polymères est élevée par rapport à celle de la plupart des électrolytes "sel dans polymère" classiques. Etant donné leur conductivité à des températures élevées et leur large fenêtre électrochimique, ces matières sont particulièrement utiles en tant qu'électrolytes pour batteries au lithium rechargeables.

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