Patent ID: 8119292

Claim:
A lithium secondary battery comprising: a cathode, an anode, an electrolyte, and a separator, wherein the anode comprises an anode active material having a specific surface area of 3 m 2 /g or less, and the electrolyte comprises 1˜4 parts by weight of a propane sultone-based compound substituted with at least one electron withdrawing group (EWG), based on 100 parts by weight of the electrolyte, and wherein the propane sultone-based compound substituted with an electron withdrawing group (EWG) is a compound represented by the following Formula 1: wherein X represents a substituent selected from the group consisting of cyano (CN), nitro (NO 2 ), trifluoromethanesulfonyl (SO 2 CF 3 ), pentafluoroethane sulfonyl (SO 2 C 2 F 5 ), methanesulfonyl (SO 2 CH 3 ), phenylsulfonyl (SO 2 Ph), acetyl (COCH 3 ), and methyl ester (COOCH 3 ), and n is an integer between 1 and 3.