NON-AQUEOUS ELECTROLYTE CONTAINING NON-AQUEOUS ELECTROLYTE ADDITIVE, AND LITHIUM SECONDARY BATTERY INCLUDING SAME

The present invention provides a non-aqueous electrolyte including an additive for a non-aqueous electrolyte represented by Formula 1 below: wherein in Formula 1 above, R and R may each independently be any one selected from the group consisting of H; F; a nitrile group; a thiocyanate group; an isothiocyanate group; an isocyanate group; an alkoxycarbonyl group having 1 to 10 carbon atoms; an alkylcarbonyl group having 1 to 10 carbon atoms; a sulfonyl group substituted with an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkynyl group having 2 to 10 carbon atoms; an oxysulfonyl group substituted with an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkynyl group having 2 to 10 carbon atoms; CF; OCF;COOCF; and SOCF (except when R and R are H at the same time), and R to R may each independently be any one selected from the group consisting of H, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, a cycloalkenyl group having 3 to 12 carbon atoms, and an aryl group having 6 to 20 carbon atoms