Electrolyte for preventing lithium ion battery from being overcharged and lithium ion battery

By adding tetrathio-rich evaporation ester substances that are easily soluble in ester solvents to the electrolyte of the lithium-ion battery, as an overcharge protection additive, the solvent decomposition and thermal runaway problems of lithium-ion batteries during overcharging are solved. It has achieved stable operation and safety improvements below 4.5V.

CN119153784AInactive Publication Date: 2024-12-17WUHU ETC BATTERY LTD
View PDF 4 Cites 0 Cited by

Patent Information

Application Number
CN202411174156.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-08-26
Publication Date
2024-12-17
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Lithium-ion batteries are prone to decomposition of solvents, thermal runaway, and even explosions when overcharged. The existing overcharge protection additives are not solubility in the electrolyte, which cannot effectively prevent the battery from overcharging.

Method used

Adding tetrathio-rich elecyl ester substances that are easily soluble in ester solvents to the electrolyte solution has electron-absorbing ester groups, which improves redox potential and solubility. As an overcharge protection additive, it can consume excess electrons when the battery is overcharged , stabilizes the voltage and forms a secondary protection when the voltage rises further to prevent the electrolyte from decomposing.

Benefits of technology

Effectively prevent lithium-ion batteries from operating normally below 4.5V, avoiding the electrolyte decomposition at high voltage, improving the battery's overcharge safety and extending the battery's stable running time.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN119153784A_ABST
    Figure CN119153784A_ABST
Patent Text Reader

Abstract

The invention discloses an electrolyte for preventing overcharge of a lithium ion battery and the lithium ion battery. The electrolyte is prepared from the following raw materials: an ester solvent, a lithium salt and a tetrathio-fulvalene ester additive which is easily dissolved in the ester solvent, the tetrathio-fulvalene ester additive which is easily dissolved in the ester solvent is added into the electrolyte, can consume redundant electrons to stabilize the voltage when the battery is overcharged, can consume electrons again to stabilize the constant voltage when the voltage is further increased to form secondary protection, and can protect the normal operation of the battery at 4.5 V or below, so that the service life of the battery is prolonged, and the service life of the battery is prolonged. And thermal runaway caused by decomposition of the electrolyte under high voltage is avoided.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Lithium ion battery and electrolyte solution thereof

    CN103337658A

  • Flow battery positive electrode electrolyte based on tetrathiafulvalene dicarboxylic acid ethyl ester and preparation method of flow battery positive electrode electrolyte

    CN112271314A

  • Electrochemical device and electronic device comprising the same

    CN114583177A

  • Lithium secondary battery

    US20220052381A1