Lithium Secondary Battery

Abstract: The present invention relates to a lithium secondary battery comprising: an anode including an anode active material; a cathode including a cathode active material; a separator interposed between the anode and the cathode; and an electrolyte, wherein the anode active material includes silicon particles, the cathode active material includes a lithium manganese-based oxide represented by [chemical formula 1], the Si depth of charge, represented by the following formula (1), is 30% to 60%, and the Si depth of discharge, represented by the following formula (2), is 10% or more. Formula (1): Si depth of charge (%) = {(cathode loading amount + anode pre-lithiation capacity)/anode loading amount} ×100, and Formula (2): Si depth of discharge (%) = {(cathode loading amount + anode pre-lithiation capacity - discharge loading amount) /anode loading amount} ×100, wherein in formulae (1) and (2), the cathode loading amount is the capacity per unit area of the cathode (unit: mAh/cm2), the anode loading amount is the capacity per unit area of the anode (unit: mAh/cm2), the anode pre-lithiation capacity is the capacity per unit area of lithium (Li) intercalated into the anode by pre-lithiation (unit: mAh/cm2), and the discharge loading amount is a value obtained by dividing the discharge capacity of the secondary battery by the cathode area at the discharge cut-off voltage.

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