Ionic liquid with excellent thermal stability for lithium battery and preparation method of ionic liquid

Through the reaction of neopentyl glycol, oxychloride and imidazole compounds, cationic polyimidazole ionic liquid with high thermal stability and high crosslinking is prepared, which solves the problem of decomposition of traditional ionic liquids at high temperatures and improves the thermal stability and safety of lithium batteries.

CN119798538AInactive Publication Date: 2025-04-11SHANDONG HUACHENG HIGH TECH ADHESIVE
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Patent Information

Application Number
CN202510018814.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-07
Publication Date
2025-04-11
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Traditional ionic liquids are prone to decomposition at high temperatures, resulting in a decrease in thermal stability, which affects the performance and safety of lithium-ion batteries.

Method used

Intermediate 1 is obtained by reaction of neopentyl glycol and phosphorus trichloride, and then reacting with 1-(1H-imidazole-1-yl)propan-2-ol to obtain intermediate 2, then reacting with 3-bromo-1-propylene to form imidazole cations, followed by polymerization and crosslinking, and finally reacting with ammonium hexafluorophosphate to obtain a cationic polyimidazole ionic liquid with high thermal stability and high crosslinking.

Benefits of technology

This ionic liquid is not easy to decompose at high temperatures, improving the thermal stability and safety of lithium batteries, avoiding the risks of short circuit and thermal runaway from the lithium battery, and at the same time achieving rapid charging and discharging of lithium batteries.

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Abstract

The invention relates to the field of lithium batteries, in particular to an ionic liquid with excellent thermal stability for a lithium battery and a preparation method of the ionic liquid, and aims to solve the problem that the performance and the safety of the lithium ion battery are influenced due to the fact that the thermal stability of the traditional ionic liquid is reduced because the traditional ionic liquid is easy to decompose at a high temperature. The ionic liquid is composed of a large number of imidazole cations and hexafluorophosphoric acid anions, rapid charging and discharging of a lithium battery are achieved, the ionic liquid is of a high-crosslinking-degree polymer structure, after a benzene ring and a large number of phosphorus elements are introduced into the ionic liquid, the thermal stability of the ionic liquid can be improved, the ionic liquid is not prone to decomposition at high temperature, and the service life of the ionic liquid is prolonged. The high-temperature cycling stability of the lithium battery is further ensured, so that the risks of short circuit and thermal runaway of the lithium battery are avoided, the safety of the lithium battery is improved, the service life of the lithium battery is prolonged, and the preparation method is simple in operation, easy in raw material obtaining, low in cost and suitable for large-scale industrial production.
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