Lithium ion battery electrolyte and lithium ion battery

• Main Authors: HU QIYANG, LI XINHAI, PENG WENJIE, WANG ZHIXING, YAN GUOCHUN, GUO HUAJUN, WANG SIWU, WANG JIEXI
• Format: Patent
• Language: Chinese; English
• Published: 26.05.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a lithium ion battery electrolyte and a lithium ion battery. The electrolyte comprises an organic solvent, an additive and an electrolyte lithium salt, wherein the additive is composed of a first additive and a second additive; the first additive is one or more of ethylene sulfate, 4-methyl ethylene sulfate, 4-ethyl ethylene sulfate, 4-butyl ethylene sulfate, propylene sulfate, 4-methyl propylene sulfate and 4,5-dimethyl propylene sulfate. The second additive is one or more of tetrafluoroethyl trifluoroethyl ether, tetrafluoroethyl tetrafluoropropyl ether, tetrafluoroethyl hexafluorobutyl ether and tetrafluoroethyl octafluoropentyl ether. The invention further provides a lithium ion battery, the first additive and the second additive are applied to the lithium ion battery, the capacity retention rate and the capacity recovery rate of the lithium ion battery during high-temperature storage can be improved, and the thickness increase of the lithium ion battery canbe effectively inhibited.