Non-aqueous electrolyte containing fluorine-substituted succinic anhydride and succinic anhydride derivatives, and alkali metal secondary battery comprising thereof

The invention relates to non-aqueous electrolyte containing fluorine-substituted succinic anhydride and succinic anhydride derivatives, and an alkali metal secondary battery comprising the non-aqueous electrolyte. The non-aqueous electrolyte comprises: electrolyte of alkali metal salt, a non-aqueous solvent, and an additive containing fluorine-substituted succinic anhydride or fluorine-substituted succinic anhydride derivatives, wherein the additive is any one or a combination of more than two selected from fluorine-substituted succinic anhydride and fluorine-substituted succinic anhydride derivatives. According to the invention, the secondary battery manufactured with the non-aqueous electrolyte has good charging and discharging efficiencies, good electrochemical stability, good thermal stability, and overcharge protection property. The flexibility of the application is high, and the application scope is wide.