ELECTROLYTE AND LITHIUM METAL BATTERY COMPRISING SAID ELECTROLYTE, BATTERY MODULE, BATTERY PACK, AND APPARATUS

This application provides an electrolytic solution and a lithium metal battery containing the electrolytic solution. The electrolytic solution includes a lithium salt, an organic solvent, and an additive. The additive includes a sultam compound represented by Structural Formula I. R is selected from substituted or unsubstituted C to C hydrocarbyls, where a substituent is selected from a phenyl, C to C alkyls, or C to C alkenyls. X is a sulfur atom or a phosphorus atom. R and R each are independently selected from an oxygen atom, a fluorine atom, a chlorine atom, a bromine atom, and substituted or unsubstituted C1 to C10 hydrocarbyls. Both R and R are not oxygen atoms concurrently. The sultam compound used as an additive in the electrolytic solution according to this application contains a sulfonyl group, and can form an electrolyte interface film on surfaces of both the positive electrode and the negative electrode, where the film is formed from substances such as sulfate, sulfonate lithium salt, and polysulfonimide. The electrolyte interface film formed in this way is of high ion conductivity, helps to reduce the resistance of the battery, and suppresses excessive side reactions between the positive and negative electrodes and the electrolytic solution, thereby improving cycle performance of the battery.