POLYMER ELECTROLYTES CONTAINING BORON-BASED COMPOUNDS AS ANION RECEPTORS FOR LITHIUM SECONDARY BATTERIES AND LITHIUM SECONDARY BATTERIES

摘要

A polymer electrolyte for a lithium secondary battery is provided to ensure electrochemical stability, enhance cation yield, thereby improving performances of a battery. A polymer electrolyte comprises a boron-based compound represented by the formula of BY, wherein Y is PO4 or N. The boron-based compound of the formula is added in an amount of 0.1-10wt% based on the total weight of polymer. The polymer electrolyte further includes a polymer matrix and a lithium salt or/and a plasticizer, or/and nonwoven fabric. The lithium salt is at least one selected from the group consisting of LiClO4, LiBF4, LiCF3SO3, LiPF6, LiAsF6, Li(CF3SO2)2N, and LiBOB. The nonwoven fabric has a thickness of 10-200 micron and a pore size of 1-100 micron.