A lithium-ion battery, comprising an electrode assembly and an electrolyte, wherein the electrode assembly comprises a positive electrode plate, a negative electrode plate, and a separator, wherein a positive active material of the positive electrode plate comprises Li x1 Co y1 M 1-y1 O 2-z1 Q z1, wherein 0.5 ≤ x1 ≤ 1.2, 0.8 ≤ y1 < 1.0, 0 ≤ z1 ≤ 0.1, M is selected from one or more of Al, Ti, Zr, Y, and Mg, and Q is selected from one or more of F, Cl, and S; the electrolyte contains an additive A, an additive B, and an additive C, wherein the additive A is selected from one or more of compounds represented by Formula 1-1, Formula 1-2, and Formula 1-3, the additive B is selected from one or more of compounds represented by Formula II-1 and Formula II-2, and the additive C is selected from one or more of compounds represented by Formula III-1; in the Formula 1-1, the Formula 1-2, and the Formula 1-3, R 1, R 2, R 3, and R 4 are each independently selected from a hydrogen atom, a halogen atom, a substituted or unsubstituted C 1 -C 12 alkyl group, a substituted or unsubstituted C 1 -C 12 alkoxy group, a substituted or unsubstituted C 1 -C 12 amine group, a substituted or unsubstituted C 2 -C 12 alkenyl group, a substituted or unsubstituted C 2 -C 12 alkynyl group, a substituted or unsubstituted C 6 -C 26 aryl group, or a substituted or unsubstituted C 2 -C 12 heterocyclic group, wherein a substituent group is selected from one or more of a halogen atom, a nitrile group, a C 1 -C 6 alkyl group, a C 2 -C 6 alkenyl group, and a C 1 -C 6 alkoxy group; x, y, and z are each independently selected from integers 0-8; and m, n, and k are each independently selected from integers 0-2; in the Formula II-1, R 31, R 32, R 33, R 34, R 35, R 36, R 37, R 38, and R 39 are each independently selected from a halogen substituted or unsubstituted C 1 -C 6 alkyl group; and in the Formula II-2, R 41, R 42, R 43, R 44, R 45, R 46, R 47, R 48, and R 49 are each independently selected from a halogen substituted or unsubstituted C 1 -C 6 alkyl group; and in the Formula III-1, R 21 is selected from a halogen substituted C 1 -C 6 alkylene group or a halogen substituted C 2 -C 6 alkenylene group. a positive active material of the positive electrode plate comprises Li x1 Co y1 M 1-y1 O 2-z1 Q z1, wherein 0.5 ≤ x1 ≤ 1.2, 0.8 ≤ y1 < 1.0, 0 ≤ z1 ≤ 0.1, M is selected from one or more of Al, Ti, Zr, Y, and Mg, and Q is selected from one or more of F, Cl, and S; the electrolyte contains an additive A, an additive B, and an additive C, wherein the additive A is selected from one or more of compounds represented by Formula 1-1, Formula 1-2, and Formula 1-3, the additive B is selected from one or more of compounds represented by Formula II-1 and Formula II-2, and the additive C is selected from one or more of compounds represented by Formula III-1; in the Formula 1-1, the Formula 1-2, and the Formula 1-3, R 1, R 2, R 3, and R 4 are each independently selected from a hydrogen atom, a halogen atom, a substituted or unsubstituted C 1 -C 12 alkyl group, a substituted or unsubstituted C 1 -C 12 alkoxy group, a substituted or unsubstituted C 1 -C 12 amine group, a substituted or unsubstituted C 2 -C 12 alkenyl group, a substituted or unsubstituted C 2 -C 12 alkynyl group, a substituted or unsubstituted C 6 -C 26 aryl group, or a substituted or unsubstituted C 2 -C 12 heterocyclic group, wherein a substituent group is selected from one or more of a halogen atom, a nitrile group, a C 1 -C 6 alkyl group, a C 2 -C 6 alkenyl group, and a C 1 -C 6 alkoxy group; x, y, and z are each independently selected from integers 0-8; and m, n, and k are each independently selected from integers 0-2; in the Formula II-1, R 31, R 32, R 33, R 34, R 35, R 36, R 37, R 38, and R 39 are each independently selected from a halogen substituted or unsubstituted C 1 -C 6 alkyl group; and in the Formula II-2, R 41, R 42, R 43, R 44, R 45, R 46, R 47, R 48, and R 49 are each independently selected from a halogen substituted or unsubstituted C 1 -C 6 alkyl group; and in the Formula III-1, R 21 is selected from a halogen substituted C 1 -C 6 alkylene group or a halogen substituted C 2 -C 6 alkenylene group.