NONAQUEOUS ELECTROLYTIC SOLUTION FOR SECONDARY BATTERIES, AND LITHIUM ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide: an incombustible nonaqueous electrolytic solution for secondary batteries which allows a lithium ion secondary battery high in initial charge and discharge efficiencies and superior in cycle characteristics to be obtained; and a safe lithium ion secondary battery high in initial charge and discharge efficiencies and superior in cycle characteristics.SOLUTION: A nonaqueous electrolytic solution for secondary batteries comprises: an electrolyte; and a liquid composition. The electrolyte includes at least one lithium salt. The liquid composition includes: a particular fluorine-containing solvent (α); a particular compound (&bgr;), such as an organic acid anhydride; and a cyclic carboxylic ester compound. A lithium ion secondary battery comprises the nonaqueous electrolytic solution for secondary batteries.