Patent ID: 7510807

Claim:
A non-aqueous electrolyte for a lithium secondary battery, comprising: a lithium salt; an organic solvent comprising a mixed solvent of a carbonate solvent and an aromatic hydrocarbon solvent; a first additive compound selected from the group consisting of compounds represented by formula (1) and derivatives thereof, where R 1 is selected from the group consisting of, alkyls, ester radicals, and aliphatic carbonate radicals, and the first additive compound is present in an amount from 0.01 to 5 wt. % based on the total amount of electrolyte; and a second additive compound selected from the group consisting of compounds represented by formula (3), where X is selected from the group consisting of halogen radicals, cyano radicals, and nitro radicals, and the second additive compound is present in an amount from 0.01 to 5 wt % based on the total amount of electrolyte.