Experimental study reveals reduced ionic conductivity and self-diffusion with increasing salt concentration in lithium-doped ionic liquids, indicating slower ion transport at higher doping levels.
Ion transport processes in mixtures of 1-methyl-3-pentylimidazolium tetrafluoroborate ([MPI][BF4]) and lithium tetrafluoroborate (LiBF4) are characterized using conductivity and pulsed field gradient NMR measurements at various temperatures. The viscosity, ionic conductivity, molar conductivity, and self diffusion coefficient in neat [MPI][BF4] and LiBF4-doped [MPI][BF4] change with temperature following the Vogel-Tamman-Fulcher equation, and the density shows a linear decrease. The ionic conductivity and the self-diffusion coefficient of each ionic specie decrease with increasing concentration of LiBF4 in LiBF4-doped [MPI][BF4]. The correlation between ionic conductivity and viscosity is based on the classical Walden rule, the α□ values of neat [MPI][BF4] and LiBF4-doped [MPI][BF4] calculated from the slopes of the Walden plots are compared to those calculated from the ratio of activation energies for viscosity and molar conductivity (Ea,Λ/Ea,η). The comparison of activation energies of the reciprocal of viscosity, the ionic conductivity, and individual ion diffusion against the LiBF4 concentration is also studied.
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Wu et al. (2012) studied this question.
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