The present invention provides a non-
aqueous electrolyte comprising a
lithium salt, an
organic solvent, and a compound of the following
Chemical Formula 1 as an additive, r1 is any one selected from the group consisting of F, R, an
alkyl group having 1 to 10 carbon atoms, which may be substituted with one or more
fluorine atoms, an alkenyl group having 2 to 10 carbon atoms, which may be substituted with one or more
fluorine atoms, an alkynyl group having 2 to 10 carbon atoms, which may be substituted with one or more
fluorine atoms, OR'and OCOR '; and R'is any one selected from the group consisting of an
alkyl group having 1 to 10 carbon atoms, which may be substituted with one or more fluorine atoms, an alkenyl group having 2 to 10 carbon atoms, which may be substituted with one or more fluorine atoms, and an alkynyl group having 2 to 10 carbon atoms, which may be substituted with one or more fluorine atoms, where in
Chemical Formula 1 and R1, R1 represents an
alkyl group having 1 to 10 carbon atoms, which may be substituted with one or more fluorine atoms, and R2 represents an alkyl group having 1 to 10 carbon atoms, which may be substituted with one or more fluorine atoms. R has a structure represented by the following
Chemical Formula 2, and in Chemical Formula 2, Rx and Ry are each independently H or F. [Chemical Formula 1] and [Chemical Formula 2].