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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
Lithium solvation in bis(trifluoromethanesulfonyl)imide-based ionic liquids
Jean-Claude Lassègues1, Joseph Grondin, David Talaga
1Laboratoire de Physico-Chimie Moléculaire, UMR 5803, CNRS, Université Bordeaux I, 351 Cours de la Libération, 33405, Talence Cedex, France. jc.lassegues@lpcm.u-bordeaux1.fr
Abstract:
The lithium solvation in (1 -x)(EMI-TFSI), xLiTFSI ionic liquids where EMI(+) is the 1-ethyl-3-methylimidazolium cation and TFSI(-) the bis(trifluoromethanesulfonyl)imide anion, is shown by Raman spectroscopy to involve essentially [Li(TFSI)(2)](-) anionic clusters for 0 < x < 0.4, but addition of stoichiometric amounts of solvents S such as oligoethers changes the lithium solvation into [Li(S)(m)](+) cationic clusters; the lithium transference number in TFSI-based ionic liquid electrolytes for lithium batteries should thus be strongly improved.
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