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Lithium solvation and diffusion in the 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ionic liquid

✍ Scribed by Sandrine Duluard; Joseph Grondin; Jean-Luc Bruneel; Isabelle Pianet; Axelle Grélard; Guy Campet; Marie-Hélène Delville; Jean-Claude Lassègues

Publisher: John Wiley and Sons
Year: 2008
Tongue: English
Weight: 227 KB
Volume: 39
Category: Article
ISSN: 0377-0486
DOI: 10.1002/jrs.1896

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✦ Synopsis

Abstract

The Raman spectra of (1 − x)(BMITFSI), __x__LiTFSI ionic liquids, where 1‐butyl‐3‐methylimidazolium cation (BMI^+^) and bis(trifluoromethane‐sulfonyl)imide anion (TFSI^−^) are analyzed for LiTFSI mole fractions x < 0.4. As expected from previous studies on similar TFSI‐based systems, most lithium ions are shown to be coordinated within [Li(TFSI)~2~]^−^ anionic clusters. The variation of the self‐diffusion coefficients of the ^1^H, ^19^F, and ^7^Li nuclei, measured by pulsed‐gradient spin‐echo NMR (PGSE‐NMR) as a function of x, can be rationalized in terms of the weighted contribution of BMI^+^ cations, TFSI^−^ ‘free’ anions, and [Li(TFSI)~2~]^−^ anionic clusters. This implies a negative transference number for lithium. Copyright © 2008 John Wiley & Sons, Ltd.

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