Patent ID: 10862167

Abstract:
The present application provides a high-temperature lithium-ion battery electrolyte, including a lithium salt, an organic solvent, and a water removal additive. A structural formula of the water removal additive is shown as a formula (1): where R1 is a —NCH—(CH2)n—CN group, and 0<n≤20; R2 is a —R11—CO—NR12R13 group, R11 is a —(CH2)m— group, 0≤m<19, each of R12 and R13 is one independently selected from H and —(CH2)x—CH3 groups, 0≤x≤19-m, and both m and x are integers; and R3 is any one selected from H, F, Cl, and Br. The high-temperature lithium-ion battery electrolyte can effectively eliminate trace water in a battery system, restrain HF generation, protect an electrochemical system in a battery, and significantly improve high-temperature storage performance and high-temperature cycling performance of a lithium-ion battery. The present invention further provides a production method for the electrolyte and a high-temperature lithium-ion battery that includes the electrolyte.