Lithium Secondary Battery

Abstract: The present invention relates to a lithium secondary battery comprising: a cathode; an anode; a separator interposed between the cathode and the anode; and a nonaqueous electrolyte, wherein: the cathode includes a cathode active material; the cathode active material includes an overlithiated manganese-rich oxide comprising 50 mol% or higher of Mn from among all of the metals therein, which excludes lithium, and having a molar ratio of lithium to transition metals that exceeds 1; the nonaqueous electrolyte includes a lithium salt, an organic solvent and an additive; the organic solvent includes a first organic solvent and a second organic solvent; the first organic solvent includes ethylene carbonate; the second organic solvent includes diethyl carbonate; and the additive includes a cyclic sulfur oxide represented by a specific chemical formula.

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