Lithium ion battery electrolyte and application thereof

By adding specific additives to the lithium-ion battery electrolyte to enhance interface stability and solubility, the problem of slow reaction rate of lithium-ion batteries at low temperatures is solved, and both high-temperature performance and battery impedance are achieved.

CN118659031BActive Publication Date: 2025-10-10ENVISION RUITAI DYNAMICS TECH (SHANGHAI) CO LTD +1
2 Cites 0 Cited by

Patent Information

Application Number
CN202410913667.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-07-08
Publication Date
2025-10-10
Estimated Expiration
2044-07-08

AI Technical Summary

Technical Problem

The reaction rate of traditional lithium-ion battery electrolytes slows down at low temperatures, resulting in limited performance. When pursuing improvements in low-temperature performance, high-temperature performance often cannot be taken into account, limiting the scope of application.

Method used

An electrolyte combination containing a non-aqueous solvent, a lithium salt and a specific additive is used. The solubility of the second additive is enhanced by the first additive, and its unsaturated bond is used to capture F- to form a CF covalent bond, thereby improving the stability of the positive electrode interface, reducing the gas production from the decomposition of the non-aqueous solvent, protecting the transition metal ions in the positive electrode, and enhancing the quality of the positive electrode-electrolyte interface and the negative electrode-electrolyte interface.

Benefits of technology

Effectively improve the low-temperature performance of lithium-ion batteries, while taking into account high-temperature performance and gas production performance, reducing battery impedance and improving overall battery performance.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The application provides a lithium ion battery electrolyte and application thereof, and the electrolyte comprises: a nonaqueous solvent; a lithium salt; and an additive, wherein the additive comprises a first additive and a second additive; the first additive is selected from compounds represented by any one of formulas (I) to (III); and the second additive comprises lithium difluorophosphate dioxalate; wherein R1 to R7 are substituents with 1 to 3 carbon atoms, 0 to 4 unsaturation degrees and 0 to 3 heteroatom numbers; R8 is a cyclic substituent with 0 to 4 unsaturation degrees and 0 to 5 heteroatom numbers; when the unsaturation degree of R8 is 0, R9 is a vinyl group, a propenyl group, a butenyl group, a 1,3-butadienyl group, an ethynyl group or a propynyl group; when the unsaturation degree of R8 is 1 to 4, the R9 substituent is absent; the heteroatom is selected from at least one of nitrogen, sulfur, phosphorus, chlorine, fluorine and oxygen; and n is 0 to 2. The lithium ion battery electrolyte and application thereof simultaneously consider the low-temperature performance, high-temperature performance and gas production performance of the lithium ion battery.
Need to check novelty before this filing date? Find Prior Art