Patent ID: 8349502

Claim:
A non-aqueous electrolyte for a secondary battery, the electrolyte comprising an electrolyte salt, an electrolyte solvent, and a compound having both a sulfonate group and a cyclic carbonate group; wherein the sulfonate group is substituted with at least one selected from the group consisting of halogen atoms, cyano group (CN), trifluoromethane group (CF 3 ), pentafluoroethane group (C 2 F 5 ), trifluoromethane-sulfonyl group (SO 2 CF 3 ), pentafluoroethanesulfony group (SO 2 C 2 F 5 ), trifluoro-methanesulfonate group (SO 3 CF 3 ), pentafluoroethanesulfonate group (SO 3 C 2 F 5 ), pentafluorophenyl (C 6 F 5 ), acetyl group (COCH 3 ), ethyl ketone group (COC 2 H 5 ), propyl ketone group (COC 3 H 7 ), butyl ketone group (COC 4 H 9 ), pentyl ketone group (COC 5 H 11 ), hexyl ketone group (COC 6 H 13 ), ethanoate group (CO 2 CH 3 ), propanoate group (CO 2 C 2 H 5 ), butanoate group (CO 2 C 3 H 7 ), pentanoate group (CO 2 C 4 H 9 ), hexanoate group (CO 2 C 5 H 11 ), a hydrogen atom C1˜C20 alkyl group, C3˜C8 cyclic alkyl group, C2˜C6 alkenyl group, halo-substituted alkyl group, and benzyl group, wherein the secondary battery is a lithium secondary battery, and wherein the electrolyte solvent is an organic solvent.