Lithium-ion battery and apparatus

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 Lix1Coy1M1-y1O2-z1Qz1, wherein 0.5≤x1≤1.2, 0.8≤y1<1.0, 0≤z1≤0.1, M is one or more selected from the group consisting of Al, Ti, Zr, Y, and Mg, and Q is one or more selected from the group consisting of F, Cl, and S;
• the electrolyte contains an additive A, an additive B, and an additive C, wherein the additive A is one or more selected from the group consisting of compounds represented by Formula I-1, Formula I-2, and Formula I-3, the additive B is one or more selected from the group consisting of compounds represented by Formula II-1 and Formula II-2, and the additive C is one or more selected from the group consisting of compounds represented by Formula III-1;
• in the Formula I-1, the Formula I-2, and the Formula I-3, R1, R2, R3, and R4 are each independently selected from a hydrogen atom, a halogen atom, a substituted or unsubstituted C1-C12 alkyl group, a substituted or unsubstituted C1-C12 alkoxy group, a substituted or unsubstituted C1-C12 amine group, a substituted or unsubstituted C2-C12 alkenyl group, a substituted or unsubstituted C2-C12 alkynyl group, a substituted or unsubstituted C6-C26 aryl group, or a substituted or unsubstituted C2-C12 heterocyclic group, wherein a substituent group is one or more selected from the group consisting of a halogen atom, a nitrile group, a C1-C6 alkyl group, a C2-C6 alkenyl group, and a C1-C6 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, R31, R32, R33, R34, R35, R36, R37, R38, and R39 are each independently selected from a halogen substituted or unsubstituted C1-C6 alkyl group;
• and in the Formula II-2, R41, R42, R43, R44, R45, R46, R47, R48, and R49 are each independently selected from a halogen substituted or unsubstituted C1-C6 alkyl group;
• and
• in the Formula III-1, R21 is selected from a halogen substituted C1-C6 alkylene group or a halogen substituted C2-C6 alkenylene group, and
• mass percent of the additive A in the electrolyte is 0.1%-10%;
• mass percent of the additive B in the electrolyte is 0.1%-10%;
• and
• mass percent of the additive C in the electrolyte is 0.1%-30%.