2008
DOI: 10.1021/jp806124w
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Spectroscopic Identification of the Lithium Ion Transporting Species in LiTFSI-Doped Ionic Liquids

Abstract: The solvation of the lithium ion in LiTFSI-doped ionic liquids based on alkyl-substituted imidazolium cations and bis(trifluoromethanesulfonyl)imide anions (TFSI-) was investigated by infrared and Raman spectroscopies. The spectral changes occurring for some TFSI- vibrations sensitive to the lithium coordination were analyzed with the help of DFT calculations. In addition, the vibrations of the lithium ion in its solvating cage were found to produce a broad IR absorption band centered at 374 cm(-1). For low to… Show more

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Cited by 298 publications
(453 citation statements)
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“…Both monodentate (one oxygen of TFSI bound to a Li + ) and bidendate (two oxygens of TFSI bound to a Li + ) coordinations were observed with a preference for the monodentate configuration in contrast to the conclusions of infrared and Raman studies of alkyl-substituted imidazolium-TFSIbased IL doped with LiTFSI [94]. Both monodentate and bidentate Li + /TFSI − configurations were observed in MD simulations of liquid AN-LiTFSI [56].…”
Section: Modeling Of Ionic Liquid Electrolytesmentioning
confidence: 89%
“…Both monodentate (one oxygen of TFSI bound to a Li + ) and bidendate (two oxygens of TFSI bound to a Li + ) coordinations were observed with a preference for the monodentate configuration in contrast to the conclusions of infrared and Raman studies of alkyl-substituted imidazolium-TFSIbased IL doped with LiTFSI [94]. Both monodentate and bidentate Li + /TFSI − configurations were observed in MD simulations of liquid AN-LiTFSI [56].…”
Section: Modeling Of Ionic Liquid Electrolytesmentioning
confidence: 89%
“…All Raman spectra were analyzed in the range 620-780 cm -1 and normalized to the 640 cm -1 band (from 625 to 685 cm -1 ), which is characteristic only for MTM57. The deconvolution analysis concentrated on the TFSI mode due to contraction / expansion of the TFSI -which provides a very strong 47 . Additionally, a minor band at approximately 739 cm -1 , originating from MTM57, was included in the deconvolution.…”
Section: Characterization Of Structural Electrolyte Based On Epoxy Resinmentioning
confidence: 99%
“…In the absence of LiTFSI, macroscopically homogeneous samples were only obtained at high epoxy resin contents (>70 -complexes ( Figure 6). 47 The molar fraction of Li cations interacting with the resin (Figure 7) was indirectly determined using the spectroscopic data ( Table 3). The percentage of "free" TFSI anions for the structural electrolytes was 2-6 times higher than for the reference sample (EMIM-TFSI+LiTFSI).…”
Section: Effect Of the Litfsi Concentration On The Morphology And Promentioning
confidence: 99%
“…The TFSI anion, though weakly coordinating, is able to solvate lithium. [11] So the observed IL-driven ionic conductivity increase for the LiZnSO 4 F-IL samples is most likely due to a Li-bearing ionic liquid layer grafted onto the surface of the LiZnSO 4 F particles (Figure 2 a). Such a surface effect does not come as a total surprise as there is past and recent evidence showing the feasibility 1) of apparently enhancing bulk conductivity by creating fast ion-conduction surfaces through controlled adjustment of stoichiometry [12] or 2) of using hybrid ionic-liquid-tethered nanoparticle materials doped with LiTFSI as electrolytes for Li batteries.…”
mentioning
confidence: 96%