Lithium solvation in bis(trifluoromethanesulfonyl)imide-based ionic liquids.
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.
Lassègues
Jean-Claude
JC
Laboratoire 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
Grondin
Joseph
J
Talaga
David
D
D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D012680:Sensitivity and Specificity; D012997:Solvents / Q000737:chemistry; D013059:Spectrum Analysis, Raman; D013449:Sulfonamides / Q000737:chemistry*
C517865:1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide; D007093:Imidazoles; D052578:Ionic Liquids; D012997:Solvents; D013449:Sulfonamides; D008094:Lithium