A comparative study of ionic conductivity, translational diffusion, molecular motion, and physicochemical properties in lithium bis(trifluoromethanesulfonyl)imide-doped 1-methyl-3-pentyl- and 1,2-dimethyl-3-pentyl-substituted imidazolium-based ionic liquids

Yi Jan Lin, Lin Hao, Yuan Chung Lin, Chung Wen Kuo, Pin Rong Chen, Tzi Yi Wu, I. Wen Sun

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7 Citations (Scopus)

Abstract

The ionic conductivity, translational diffusion, molecular motion, and physicochemical properties of ionic liquids (ILs) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI)-doped ILs with two different imidazolium cations (1-methyl-3-pentylimidazolium [MPI]+ and 1,2-dimethyl-3-pentyl-imidazolium [DMPI]+) are characterized. Self-diffusion coefficients D for the anion and the cation are measured by pulsed field gradient spin echo NMR (PGSE-NMR), the measured ion diffusion coefficients, viscosities, and ionic conductivity follow the Vogel-Tammann-Fulcher (VTF) equation for the temperature dependencies, and the best-fit parameters are determined. LiTFSI-doped [MPI][TFSI] shows a NOE signal between Li+ and MPI+ and a broad Li peak was observed in HOESY spectra, whereas there is no NOE signal in LiTFSI-doped [DMPI][TFSI], demonstrating that one additional methyl group at the C-2 position in the DMPI+ may prevent Li+ to be closed to DMPI+ via steric hindrance.

Original languageEnglish
Pages (from-to)8097-8114
Number of pages18
JournalInternational Journal of Electrochemical Science
Volume8
Issue number6
Publication statusPublished - 2013 Jun 1

All Science Journal Classification (ASJC) codes

  • Electrochemistry

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