Al-Masri D , Yunis R , Hollenkamp AF , and Pringle JM
Chemical Communications (Cambridge, England) [Chem Commun (Camb)] 2018 Apr 05; Vol. 54 (29), pp. 3660-3663.
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.