| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium secondary battery which is superior in battery characteristics such as a battery cycle characteristic, electrical capacity, conservation characteristic, etc. SOLUTION: The nonaqueous electrolyte solution and the lithium secondary battery using it specify that the nonaqueous electrolytic solution, having an electrolyte-dissolved nonaqueous solvent contains biphenyl derivatives of 0.001 to 0.8 weight % expressed by formula (I) hydrogen (in the formula Y shows a group of hydroxyl, alkoxy or hydrocarbon, hydrogen atom, a group of acyloxy, alkoxycarbonyloxy or alkylsulfonic acid and where each of R1, R2, R3, R4 and R5 independently shows a hydrocarbon group, having carbon number such as 1 to 12). |
