Lithium ion battery

By adding fluoroorganic substances with the structure of Formula I to the electrolyte of the lithium-ion battery and combining the degree of graphite ordering of graphite, the problem of the electrolyte not withstand high voltage is solved, and the low cycle impedance and excellent cycle capacity retention of the battery are achieved.

CN119695245AActive Publication Date: 2025-03-25CALB GROUP CO LTD
10 Cites 0 Cited by

Patent Information

Application Number
CN202411891691.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2025-03-25
Estimated Expiration
2044-12-20

AI Technical Summary

Technical Problem

The electrolyte of existing lithium-ion batteries is not withstand high voltage, resulting in poor circulation performance, increased polarization, reduced constant current capacity, and lithium evolution may occur.

Method used

The fluorogenic organic substance with the structure of formula I was added to the electrolyte solution, and combined with the degree of graphite ordering of graphite in the negative electrode sheet, it satisfies the relationship between the specific mass content and ordering degree: 0.018≤a×b≤0.165 to optimize the battery performance.

Benefits of technology

Through this method, the cyclic impedance growth rate of the lithium-ion battery is reduced, and the cyclic capacity retention rate is excellent, which improves the high voltage tolerance and cyclic performance of the battery.

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

Abstract

The invention provides a lithium ion battery. The lithium ion battery comprises a battery cell and an electrolyte, the battery cell comprises a positive plate and a negative plate; the positive plate comprises a positive active material, and the positive active material comprises a lithium nickel manganese oxide material; the lithium nickel manganese oxide material has a general formula of LiNi < x > Mn < 2-x > O < 4, 0 lt >, xlt; 1; the electrolyte comprises fluoro ester with a structure shown in a formula I; the mass content of the fluorinated organic matter with the structure shown in the formula I in the electrolyte is a; the negative plate comprises a negative active material, the negative active material comprises graphite, and the graphite ordering degree of the graphite is b; a and b meet the relational expression that a * b is greater than or equal to 0.018 and less than or equal to 0.165. According to the battery, fluoroester with the mass content of a and the structure shown in the formula I is added into the electrolyte, and under the condition that the fluoroester and the graphite ordering degree b of the negative electrode active material graphite in the negative electrode sheet meet the relational expression that a * b is larger than or equal to 0.018 and smaller than or equal to 0.165, the battery has the low DCR growth rate and the excellent cycle capacity retention rate.
Need to check novelty before this filing date? Find Prior Art