Electrolyte solution for sodium-ion battery, secondary battery, battery module, battery pack, and electrical apparatus

Abstract

The present application provides an electrolyte solution for a sodium-ion battery, comprising a sodium salt of formula NaBOaFxRy−z, a fluoroalkyl ether, and other ethers except for the fluoroalkyl ether, wherein a, x, y, and z are as defined in the specification. The electrolyte solution according to the present application has good stability, particularly oxidation resistance and good solvability of sodium ions, thus broadening an electrochemical window of a corresponding sodium-ion battery, enhancing coulombic efficiency, and improving cycling performance and safety performance. The present application further provides a secondary battery, a battery module, a battery pack, and an electrical apparatus using the electrolyte solution for a sodium-ion battery.

Dependencies are inferred from the claim text.