Patent ID: 7083878

Claim:
A nonaqueous electrolytic solution comprising a lithium salt and a nonaqueous solvent dissolving the same, wherein the electrolytic solution contains, as the lithium salt, LiPF 6 in a concentration of from 0.2 to 2 mole/L, and LiBF 4 and/or a compound represented by the following formula (1) in a molar ratio of from 0.005 to 0.4 with respect to LiPF 6 , and the nonaqueous solvent mainly comprises: (1) ethylene carbonate and/or propylene carbonate, (2-1) a symmetric linear carbonate, (2-2) an asymmetric linear carbonate, and (3) vinylene carbonate: (In the formula, R represents a linear or branched alkylene group having from 1 to 20 carbon atoms, which may be substituted by a fluorine atom, provided that the alkylene chain except for a side chain has 12 or less carbon atoms).