An electrolyte, characterized by comprising an additive A, an additive B, and an additive C, wherein the additive A is selected from a group consisting of multi-cyano six-membered N-heterocyclic compounds represented by Formula I-1, Formula I-2 and Formula I-3, and combinations thereof: wherein R 1, R 2, R 3 and R 4 are each independently selected from a group consisting of hydrogen, halogen, substituted or unsubstituted C 1 -C 12 alkyl, substituted or unsubstituted C 1 -C 12 alkoxy, substituted or unsubstituted C 1 -C 12 amine group, substituted or unsubstituted C 2 -C 12 alkenyl, substituted or unsubstituted C 2 -C 12 alkynyl, substituted or unsubstituted C 6 -C 26 aryl, and substituted or unsubstituted C 4 -C 12 heterocyclic group; the substituent for the above groups, if present, is independently selected from a group consisting of halogen, cyano, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 1 -C 6 alkoxy, and combinations thereof; x, y and z are each an integer independently selected from 0-8; and m, n and k are each an integer independently selected from 0-2; and wherein the additive B is at least one sulfonate compound selected from a group consisting of a sultone compound, a disulfonate compound, and combinations thereof, wherein the sultone compound is selected from a group consisting of compounds represented by Formula II-1, and combinations thereof, wherein R 21 is selected from substituted or unsubstituted C 1 -C 6 alkylene, and substituted or unsubstituted C 2 -C 6 alkenylene, wherein the substituent for the above groups, if present, is halogen, C 1 -C 3 alkyl, or C 2 -C 4 alkenyl; and wherein the disulfonate compound is selected from a group consisting of compounds represented by Formula II-2, and combinations thereof, wherein R 22, R 23, R 24 and R 25 are each independently selected from hydrogen, halogen, substituted or unsubstituted C 1 -C 10 alkyl, and substituted or unsubstituted C 2 -C 10 alkenyl, wherein the substituent for the above groups, if present, is halogen, C 1 -C 3 alkyl, or C 2 -C 4 alkenyl, wherein the additive C is at least one unsaturated bond-containing cyclic carbonate compound, and the additive C is from 0.1% to 10% by weight of the electrolyte. wherein R 1, R 2, R 3 and R 4 are each independently selected from a group consisting of hydrogen, halogen, substituted or unsubstituted C 1 -C 12 alkyl, substituted or unsubstituted C 1 -C 12 alkoxy, substituted or unsubstituted C 1 -C 12 amine group, substituted or unsubstituted C 2 -C 12 alkenyl, substituted or unsubstituted C 2 -C 12 alkynyl, substituted or unsubstituted C 6 -C 26 aryl, and substituted or unsubstituted C 4 -C 12 heterocyclic group; the substituent for the above groups, if present, is independently selected from a group consisting of halogen, cyano, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 1 -C 6 alkoxy, and combinations thereof; x, y and z are each an integer independently selected from 0-8; and m, n and k are each an integer independently selected from 0-2; and wherein the additive B is at least one sulfonate compound selected from a group consisting of a sultone compound, a disulfonate compound, and combinations thereof, wherein the sultone compound is selected from a group consisting of compounds represented by Formula II-1, and combinations thereof, wherein R 21 is selected from substituted or unsubstituted C 1 -C 6 alkylene, and substituted or unsubstituted C 2 -C 6 alkenylene, wherein the substituent for the above groups, if present, is halogen, C 1 -C 3 alkyl, or C 2 -C 4 alkenyl; and wherein the disulfonate compound is selected from a group consisting of compounds represented by Formula II-2, and combinations thereof, wherein R 22, R 23, R 24 and R 25 are each independently selected from hydrogen, halogen, substituted or unsubstituted C 1 -C 10 alkyl, and substituted or unsubstituted C 2 -C 10 alkenyl, wherein the substituent for the above groups, if present, is halogen, C 1 -C 3 alkyl, or C 2 -C 4 alkenyl, wherein the additive C is at least one unsaturated bond-containing cyclic carbonate compound, and the additive C is from 0.1% to 10% by weight of the electrolyte.