Patent ID: 8389163

Claim:
A lithium secondary battery comprising: a positive electrode including a positive electrode active material; a negative electrode including a negative electrode active material; and a non-aqueous electrolyte, wherein said positive electrode active material comprises at least one lithium-containing composite oxide represented by the following general formula: Li x M 1 1−y M 2 y O 2 where M 1 and M 2 are different elements, M 1 being Ni or Co, and M 2 being at least one selected from Ni, Co, Mn, Mg, and Al, 1≦x≦1.05, and 0≦y≦0.7, said negative electrode active material comprises at least one selected from the group consisting of silicon, tin, a silicon-containing alloy, and a tin-containing alloy, said non-aqueous electrolyte includes m-chloroperoxybenzoic acid, and said m-chloroperoxybenzoic acid accounts for 0.1 to 5% by weight of said non-aqueous electrolyte.