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Updated: May 9, 2026

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
Ionic liquids of superior thermal stability.
Cody G Cassity1, Arsalan Mirjafari, Niloufar Mobarrez
1Department of Chemistry, University of South Alabama, Mobile, Alabama 36688, USA.
Tetraarylphosphonium-based ionic liquids show better long-term thermal stability than common imidazolium, quaternary ammonium, or tetraalkylphosphonium salts. This finding is crucial for high-temperature applications.
Area of Science:
- Materials Science
- Physical Chemistry
Background:
- Ionic liquids (ILs) are salts that are liquid at low temperatures.
- Their properties depend on cation and anion choice.
- Thermal stability is critical for many IL applications.
Purpose of the Study:
- To compare the long-term thermal stability of tetraarylphosphonium-based ILs with other common ILs.
- To identify ILs with enhanced thermal performance for demanding applications.
Main Methods:
- Head-to-head comparative study of different ionic liquid types.
- Long-term thermal stability testing under controlled conditions.
Main Results:
- Tetraarylphosphonium-based ILs demonstrated superior long-term thermal stability.
- Outperformed ILs based on imidazolium, quaternary ammonium, and tetraalkylphosphonium cations.
Conclusions:
- Tetraarylphosphonium cations confer enhanced thermal stability to ionic liquids.
- These ILs are promising for high-temperature applications where stability is paramount.
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