Nonaqueous electrolyte, lithium-ion battery, battery module, battery pack, and apparatus

A lithium-ion battery, comprising a nonaqueous electrolyte comprising a nonaqueous solvent, a lithium salt, and an additive, wherein

• the nonaqueous solvent comprises a carbonate solvent and a high oxidation potential solvent, the additive comprises cyclic sulfate;
• the high oxidation potential solvent is selected from one or more of compounds represented by formula I and formula II;
• in formula I, R1 and R2 are independently selected from unsubstituted, partially halogenated, or fully halogenated alkyl groups having 1 to 5 carbon atoms, and at least one of R1 and R2 is a partially halogenated or fully halogenated alkyl group having 1 to 5 carbon atoms;
• and in formula II, R3 is selected from partially halogenated or fully halogenated alkylidene groups having 3 to 6 carbon atoms;
• the cyclic sulfate is selected from one or more of compounds represented by formula III;
• in formula III, R4 is selected from alkylidene groups having 2 to 6 carbon atoms without halogen substitution;
• and
• the halogenated groups in formula I and II comprise a halogen atom selected from one or more of F, Cl, Br, and I;
• wherein based on a total weight of the non-aqueous solvent,
• a weight percentage of the high oxidation potential solvent is 10% to 60%;
• a weight percentage of the cyclic sulfate solvent is 0.1% to 10%;
• and
• a weight percentage of the carbonate solvent is 40% to 90%.