Electrolyte and electrochemical device containing electrolyte

An electrochemical device, wherein the electrochemical device comprises an electrolyte, wherein the electrolyte comprises a compound of formula I and a compound represented by formula II;

• wherein
• the compound of formula I comprises a compound represented by formula I-A, and at least one of a compound represented by formula I-B or a compound represented by formula I-C;
• in formula I-A, R11, R12, R13, and R14 are each independently selected from hydrogen, fluorine, and substituted or unsubstituted C1-C3 alkyl, in a case of substitution, a substituent comprises halogen, and the compound represented by formula I-A contains at least one fluorine atom;
• in formula I-B, R15 and R16 are each independently selected from substituted or unsubstituted C1-C5 alkyl, in a case of substitution, a substituent comprises halogen, and the compound represented by formula I-B contains at least one halogen atom;
• in formula I-C, R17 and R18 are each independently selected from substituted or unsubstituted C1-C5 alkyl, in a case of substitution, a substituent comprises halogen, and the compound represented by formula I-C contains at least one halogen atom;
• and
• in formula II, n is an integer from 0 to 4, A2 is selected from any one of
• and R21, R22, R23, and R24 are each independently selected from any one of a covalent single bond, C1-C5 alkylene, C2-C4 alkenylene, or
• wherein R25 is selected from any one of hydrogen, cyano, C1-C3 alkyl, or C1-C3 alkyl substituted with cyano, and R26 and R27 are each independently selected from covalent single bond or C1-C3 alkylene.