NONAQUEOUS ELECTROLYTE SOLUTION AND LITHIUM SECONDARY BATTERY USING SAME

摘要

Disclosed is a lithium secondary battery which is excellent in cycle characteristics, battery capacity and battery characteristics such as storage characteristics. A nonaqueous electrolyte solution for lithium secondary batteries wherein an electrolyte salt is dissolved in a nonaqueous solvent is characterized in that a formate compound having a specific structure is contained in the nonaqueous electrolyte solution in an amount of 0.01-10 weight% relative the nonaqueous electrolyte solution. A lithium secondary battery uses such a nonaqueous electrolyte solution. ® KIPO & WIPO 2007