Phosphorus-containing compound for lithium ion battery, nonaqueous electrolyte, and lithium ion battery

By adding phosphorus-containing compounds with specific structures to the non-aqueous electrolyte of lithium-ion batteries, a stable SEI film is formed, which solves the problems of increased internal resistance and lithium plating caused by ternary cathode materials, and improves the safety and stability of the battery.

CN115498267BActive Publication Date: 2026-04-14ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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Patent Information

Application Number
CN202211309177.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-10-25
Publication Date
2026-04-14
Estimated Expiration
2042-10-25

AI Technical Summary

Technical Problem

Existing lithium-ion batteries using ternary cathode materials with high specific capacity and high reaction potential suffer from increased internal resistance, lithium plating, and explosion risks, affecting the safety and stability of the batteries.

Method used

Adding phosphorus-containing compounds with specific structures to the non-aqueous electrolyte of lithium-ion batteries can form a more robust SEI film, reduce internal resistance, and improve lithium-ion conductivity.

Benefits of technology

It significantly reduces the internal resistance of the battery during fast charging, improves the battery's cycle life and stability, reduces gas generation and volume expansion at high temperatures, and enhances battery safety.

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Abstract

Disclosed are a phosphorus-containing compound, a nonaqueous electrolyte, and a lithium ion battery. In the present application, an additive for a lithium ion battery is provided, the phosphorus-containing compound has a structure shown in formula (I), wherein the R1 and R2 groups are as described in the context of the present application, the phosphorus-containing compound is added in a nonaqueous electrolyte, and the internal resistance of the battery can be significantly reduced, particularly the internal resistance when the battery is fast-charged.
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