RECHARGEABLE LITHIUM INTERCALATION BATTERY WITH HYBRID POLYMERIC ELECTROLYTE

摘要

A rechargeable battery comprises lithium intercalation compound electrodes (43, 47) and an interposed electrolyte of flexible polymer (45) containing a lithium salt dissolved in a polymer-compatible solvent. Preferred components include tertiary lithium manganese oxide compound positive electrodes, carbon negative electrodes, and poly(vinylidene fluoride) copolymer with 8 to 25 % by weight hexafluoropropylene electrolyte layers containing about 20 to 70 % of a solution of lithium salt in a medium-boiling solvent comprising such solvents as ethylene carbonate, propylene carbonate, and dimethyl carbonate. The electrolyte layer (45) may be employed in the form of an individual separator film or as a coated component of a multilayer battery structure to provide electrical ionic conductivity up to about 10<-3> S/cm.