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A symmetrical ionic liquid/Li salt system for rapid ion transport and stable lithium electrochemistry
journal contributionposted on 2018-04-05, 00:00 authored by Danah Al-MasriDanah Al-Masri, Ruhamah Yunis, Anthony F Hollenkamp, Jenny PringleJenny Pringle
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.