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Abstract

The present disclosure relates to a lithium secondary battery. The lithium secondary battery includes a cathode, an anode, a separator interposed between the cathode and the anode, and a non-aqueous electrolyte solution, the non-aqueous electrolyte solution includes an ionizable lithium salt and an organic solution, and includes, based on 100 parts by weight of the non-aqueous electrolyte solution, (a) 1 part by weight to 10 parts by weight of a compound containing a vinylene group or vinyl group, and (b) 0.1 parts by weight to 10 parts by weight of a dinitrile-based ether compound of a particular structure, and the cathode includes a mixture of a first cathode active material Li_xCoO₂(0.5xM_yO₂(M is Ni_1-a-bMn_aCo_b(0.05≦a≦0.4, 0.1≦b≦0.4, 0.4≦1-a-b≦0.7) in which x+y=2 and 0.95≦x≦1.05. The lithium secondary battery has a high capacity, and remarkably suppresses a swelling phenomenon at high temperature of the battery.

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First Claim