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Updated: Feb 12, 2026

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
A symmetrical ionic liquid/Li salt system for rapid ion transport and stable lithium electrochemistry
Danah Al-Masri1, Ruhamah Yunis, Anthony F Hollenkamp
1Deakin University, Melbourne, Institute for Frontier Materials, Victoria 3125, Australia. jenny.pringle@deakin.edu.au.
Abstract:
Contrary to the accepted wisdom that avoids cation symmetry for the sake of optimum electrolyte properties, we reveal outstanding behaviour for the diethylpyrrolidinium cation ([C2epyr]), in combination with the bis(fluorosulfonyl)imide (FSI) anion and Li[FSI]. The equimolar [C2epyr][Li][FSI]2 is a liquid with high conductivity, high Li transference number and >90% lithium metal cycling efficiency. The high level of performance for these electrolytes invites consideration of a new class of electrolytes for lithium batteries.
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