| 摘要 |
A nonaqueous electrolyte solution having an organic solvent and, dissolved therein, a lithium salt as an electrolyte, characterized in that the electrolyte solution further comprises 0.1 to 20 wt % of a compound obtained by partial nucleus hydrogenation of an aromatic compound having three rings represented by Ar>1<-R-Ar>2<, wherein Ar>1< represents a phenyl group which optionally has a substituent, Ar>2< represents a condensed or non-condensed aromatic group having two rings which optionally has a substituent, and R represents a direct bond, a methylene group or an alkylidene group. The above compounds obtained by partial nucleus hydrogenation include compounds obtained by partial nucleus hydrogenation of terphenyl or benzylbiphenyl; and a lithium secondary cell using the nonaqueous electrolyte solution. The nonaqueous electrolyte solution is capable of protecting a chargable lithium cell suitable for portable devices and electric cars against the damage due to frequently repeated overcharges and improving the safety of the cell, and also allows the retention of a high electric capacity even after repeated charges and discharges at a high maximum operating voltage. |
