Nonaqueous Electrolyte, And Lithium Secondary Battery Including The Same

Abstract: The present invention provides a nonaqueous electrolyte comprising: a lithium salt; an organic solvent; a compound, as a first additive, represented by chemical formula 1; and a compound, as a second additive, represented by chemical formula 2 or chemical formula 3. In chemical formula 1, R1 is any one selected from the group consisting of a C1-5 alkyl group capable of being substituted with fluorine, a C2-5 alkenyl group capable of being substituted with fluorine, a C2-5 alkynyl group capable of being substituted with fluorine, SO2R' and COR', R' is any one selected from the group consisting of a C1-5 alkyl group capable of being substituted with fluorine, a C2-5 alkenyl group capable of being substituted with fluorine and a C2-5 alkynyl group capable of being substituted with fluorine, and R2 and R3 are each independently any one selected from the group consisting of H, a C1-5 alkyl group and a C1-5 alkoxy group. In chemical formula 2, R is a C1-3 alkylene group capable of being substituted with fluorine, and R4 to R6 are each independently any one selected from the group consisting of H, a C1-3 alkyl group and a nitrile group. In chemical formula 3, R7 is a C1-8 alkylene group capable of being substituted with fluorine, and R8 is any one selected from the group consisting of H, a C1-10 alkyl group and a C3-8 cycloalkyl group.

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