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|1. (WO2018107745) ELECTROLYTE AND LITHIUM SECONDARY BATTERY|
|Applicants:||CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
|Title:||ELECTROLYTE AND LITHIUM SECONDARY BATTERY|
Provided are an electrolyte and a lithium secondary battery. The electrolyte comprises an organic solvent, a lithium salt dissolved in the organic solvent, and an additive. The lithium salt comprises a lithium salt of a nitrogen-containing aromatic heterocycle derivative. The additive comprises a fluorocyclic carbonate and a fluorophosphate salt and/or a cyclic phosphazene compound. The electrolyte of the present invention has a higher storage stability, can significantly improve cycling performance of a lithium secondary battery at normal and high temperatures, and can improve storage performance of the lithium secondary battery at a high temperature. Moreover, the lithium secondary battery has a lower internal resistance.