Non Aqueous Electrolyte And Lithium Secondary Battery Including Same

Abstract: The present invention provides a lithium secondary battery comprising: an anode comprising a silicon-based anode active material; a cathode; a separator; and a non-aqueous electrolyte, wherein the non-aqueous electrolyte comprises: a lithium salt; an organic solvent; a compound of chemical formula 1 as a first additive; and a compound of chemical formula 2 as a second additive. [Chemical formula 1] In chemical formula 1, R is an alkylene group which can be substituted with fluorine and has 1 to 5 carbon atoms, and R1 to R3 are each independently any one selected from the group consisting of H, an alkyl group having 1 to 5 carbon atoms, and a nitrile group. [Chemical formula 2] In chemical formula 2, R4 to R7 are each independently any one selected from the group consisting of an alkyl group which can be substituted with fluorine and has 1 to 10 carbon atoms and an alkenyl group which can be substituted with fluorine and has 2 to 10 carbon atoms.

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