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 comprises at least one compound selected from the compounds represented by Formula I and comprises at least one compound selected from the compounds represented by 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 —CF2CH2CH2CH2CH2—, —CF2CH2CH2CH2CF2—, —CH2CH2CH2CHFCH2—, —CH2CHFCH2CHFCH2—, —CH2CHFCH2CHFCHF—, —CH2CH2CH2CH2CHF—, —CH2CH2CH2CH(CF3)CH2—, —CF2CH2CH2CH2CH2CH2—, —CH2CH2CH2CH2CHFCH2—, —CH2CHFCH2CH2CHFCH2—, —CF2CH2CH2CH2CH2CF2—, —CH2CH2CH(CH3)CH2CHFCH2—, and —CH2CH2CH(CF3)CH2CHFCH2;
• and
• based on a total weight of the nonaqueous solvent, a weight percentage of the high oxidation potential solvent is 10% to 60%, a weight percentage of the carbonate solvent is at least 40%,
• based on a total weight of the high oxidation potential solvent, a weight percentage of the compound represented by Formula I is from 60% to 70%, and a weight percentage of the compound represented by Formula II is from 30% to 40%, wherein
• a halogen atom of the halogenated or fully halogenated alkyl groups is selected from one or more of F, Cl, Br, and I.