Lithium Secondary Battery

Abstract: The present invention relates to a lithium secondary battery which comprises: a cathode containing, as a cathode active material, an over-lithiated manganese-based oxide in which the amount of manganese among all metals excluding lithium exceeds 50 mol%, and the ratio (Li/Me) of the mole of lithium to the mole of all the metals excluding lithium exceeds 1; an anode containing a silicon-based anode active material; a separator interposed between the cathode and the anode; and an electrolyte, and which satisfies the following formula (1). Formula (1): 0.25A = B = 0.6A In formula (1), A is the area of discharge curves in a voltage range of 2.0-4.6 V in a dQ/dV graph obtained by differentiating the graph of voltage V and battery discharge capacity Q after cycle 1, which are measured while discharging the lithium secondary battery up to 2.0 V at 0.1 C after discharging same up to 4.6 V at 0.1 C, and B is the area of the discharge curves in a voltage range of 2.0-3.5 V in the dQ/dV graph.

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