Electrolyte and high nickel ncm lithium ion battery

By using an electrolyte with a specific composition in high-nickel NCM lithium-ion batteries, stable CEI and SEI films are formed, solving the problem of poor battery interface compatibility at high temperatures, improving the high-temperature cycle performance and storage performance of the batteries, and reducing production costs.

CN112635833BActive Publication Date: 2026-07-24GREE ALTAIRNANO NEW ENERGY INC
View PDF 2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GREE ALTAIRNANO NEW ENERGY INC
Filing Date
2020-12-22
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

High-nickel NCM lithium-ion batteries exhibit poor high-temperature resistance under high-temperature conditions, mainly due to the poor interfacial compatibility between the cathode material and the electrolyte, which leads to accelerated side reactions and affects the battery's cycle performance and lifespan.

Method used

An electrolyte containing LiPF6, organic solvent, additive A, film-forming additive and lithium salt additive is used to form a stable CEI film on the positive electrode surface through Si-N, Si-O and C=N bonds, and an SEI film is formed on the negative electrode, thereby reducing the HF and water content in the electrolyte and improving the interface stability.

Benefits of technology

It improves the battery's cycle performance and high-temperature storage performance, extends the battery's lifespan, and reduces production costs.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN112635833B_ABST
    Figure CN112635833B_ABST
Patent Text Reader

Abstract

The application provides an electrolyte and a high-nickel NCM lithium ion battery. The electrolyte comprises LiPF6, an organic solvent and an additive, the additive comprises an A additive, a film-forming additive and a lithium salt additive, the A additive has a compound with a structure shown in formula I, R1 to R7 are each independently selected from any one of a halogen atom, a substituted or non-substituted alkyl group with 1-6 carbon atoms, a substituted or non-substituted phenyl group, a vinyl group, an amino group and a hydrocarbyl amino group, and the hydrocarbyl amino group is formed by substituting 1 or 2 hydrogen atoms of the amino group with a hydrocarbyl group with 1-4 carbon atoms. The A additive is added in the non-aqueous electrolyte, the content of corrosive HF and water in the electrolyte of the battery can be effectively reduced, and the service life of the battery is prolonged. In addition, through the synergistic effect of the A additive, the film-forming additive and the lithium salt additive, the cycle performance and the electrical properties such as high-temperature storage of the battery are improved. The above raw materials are cheap and easy to obtain, and the production cost is low.
Need to check novelty before this filing date? Find Prior Art