Patent ID: 7247404

Claim:
An electrolyte for use in a lithium secondary battery, comprising an alkyl ammonium salt having a cation of the following Formula 1, a lithium salt, and an organic solvent: wherein R 1 to R 4 are independently a C 1 to C 6 alkyl, a C 2 to C 6 alkenyl, or substituents thereof, and wherein an anion to be linked with the cation is at least one selected from the group consisting of bis(perfluoroethylsulfonyl)imide (N(C 2 F 5 SO 2 ) 2 − ), bis(trifluoromethylsulfonyl)imide (N(CF 3 SO 2 ) 2 − ), tris(trifluoromethylsulfonyl)methide (C(CF 3 SO 2 ) 3 − ), trifluoromethane sulfonimide, trifluoromethylsulfonimide, trifluoromethylsulfonate, AsF 9 − , ClO 4 − , PF 6 − , and BF 4 − .