Patent ID: 7241536

Claim:
A lithium secondary battery comprising: a negative active material comprising carbon; a positive active material comprising a lithium-containing transition metal oxide; and an electrolyte comprising: a lithium salt; a non-aqueous organic solvent comprising a mixture of an aromatic solvent, a cyclic carbonate, and a chained carbonate, wherein the cyclic carbonate and the chained carbonate are provided in a volume ratio ranging from 1:1 to 1:9, and a volume ratio of the cyclic and chained carbonates to the aromatic solvent ranges from 1:1 to 10:1; and at least one organic compound selected from a group consisting of the compounds represented by the following Formulae (1) to (6): wherein R 1 to R 12 are each independently selected from the group consisting of primary, secondary, and tertiary alkyl groups, alkenyl groups, and aryl groups; X is hydrogen or halogen; and n and m are numerical values ranging from 0 to 3.