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

A nonaqueous electrolyte, comprising a nonaqueous solvent and a lithium salt, wherein

• the nonaqueous solvent comprises a carbonate solvent and a high oxidation potential solvent, wherein 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;
• in formula II, R3 is selected from partially halogenated or fully halogenated alkylidene groups having 1 to 6 carbon atoms;
• and
• based on a total weight of the nonaqueous solvent, a weight percentage of the high oxidation potential solvent is 10% to 60%, and further, 20% to 40%, wherein
• a halogen atom is selected from one or more of F, Cl, Br, and I, and further, the halogen atom is F.