Lithium ion battery electrolyte, lithium ion battery and application

• Main Authors: ZHANG RUIMIN, LI LIFEI, SUN YINGYING, OUYANG ZHIPENG, ZHOU LONGJIE
• Format: Patent
• Language: Chinese; English
• Published: 24.05.2024
• 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, a lithium ion battery and application. The lithium ion battery electrolyte comprises a lithium salt, a first additive, a second additive and a solvent, the first additive is one or more of compounds as shown in formulas A-C, R1 is imgabs0 #, R2 is independently selected from-H or-F, and R6 is selected from unsaturated alkenyl; the second additive is prepared from one or more of fluoroethylene carbonate, ethylene sulfate and 1, 3-propane sultone. Isocyanate and alkenyl functional groups contained in the additive can generate a synergistic effect with FEC, and a flexible and stable SEI film is formed on the surface of a silicon-based negative electrode, so that the thermal stability of a silicon negative electrode lithium ion battery is improved, the gas production problem is reduced, and the cycle life and the safety performance of the battery are prolonged. 本发明提供了一种锂离子电池电解液、锂离子电池及应用，锂离子电池电解液包括锂盐、第一添加剂、第二添加剂和溶剂；所述第一添加剂为式A～式C所示化合物中的一种或几种：R1为#imgabs0#R2、R