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1. (WO2018107745) ELECTROLYTE AND LITHIUM SECONDARY BATTERY

Pub. No.:    WO/2018/107745    International Application No.:    PCT/CN2017/093377
Publication Date: Fri Jun 22 01:59:59 CEST 2018 International Filing Date: Wed Jul 19 01:59:59 CEST 2017
IPC: H01M 10/0567
H01M 10/0568
H01M 10/0525
Applicants: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
宁德时代新能源科技股份有限公司
Inventors: ZHOU, Xiaochong
周晓崇
HAN, Changlong
韩昌隆
ZHU, Jianwei
朱建伟
LIU, Jiqiong
刘继琼
HUAN, Feng
郇凤
Title: ELECTROLYTE AND LITHIUM SECONDARY BATTERY
Abstract:
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.