An electrolyte, including a compound of formula I and lithium difluorophosphate, where X is selected from a substituted or unsubstituted C1-10 alkyl group, a substituted or unsubstituted C2-10 alkenyl group, a substituted or unsubstituted C1-5 alkyl sulfonyl group, and a substituted or unsubstituted C2-5 acyl group. In the case of substitution, a substituent is selected from a cyano group and halogen. This application further relates to an electrochemical apparatus and an electronic apparatus that include the electrolyte.