Lithium-ion battery and apparatus

A lithium-ion battery, comprising an electrode assembly and an electrolytic solution, wherein the electrode assembly comprises a positive electrode sheet, a negative electrode sheet, and a separation film;

• wherein,
• a positive active material in the positive electrode sheet comprises Lix1Coy1M1-y1O2-z1Qz1, 1≤x1≤1.2, 0.8≤y1<1.0, 0<z1≤0.1, M is selected from the group consisting of Al, Ti, Zr, Mg, and any combinations thereof, and Q is F;
• a negative active material in the negative electrode sheet comprises SiOx2, 0<x2≤2;
• the electrolytic solution contains a lithium electrolyte salt, an additive A, and an additive B, the additive A is one or more selected from the group consisting of compounds represented by Formula I-2, and the additive B is fluoroethylene carbonate (FEC);
• in the Formula I-2:
• R1, R2, R3, and R4 each are independently selected from the group consisting of a hydrogen atom, and a substituted or unsubstituted C1-C12 alkyl group, wherein a substituent group is selected from the group consisting of a halogen atom, a cyano group, and a C1-C6 alkoxy group;
• x and y each are selected from integers 0-2;
• m and n each are selected from integers 0-2;
• at least one of x and y is 0, and at least one of m and n is 2, wherein when x=0, m=1 or 2;
• when y=0, n=1 or 2;
• wherein based on total mass of the electrolytic solution, a mass percentage of the additive A is 0.1%-10%;
• and
• based on total mass of the electrolytic solution, a mass percentage of the additive B is 0.1%-30%.