Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

In this paper, the electrical conductivities of ionic liquid 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([BMIM][TFSI]) in mixed organic solvents of propylene carbonate (PC) + -butyrolactone (GBL) and ethylene carbonate (EC) + dimethyl carbonate (DMC) were measured. The effects of mixed organic solvents with different ratios (1:0, 2:1, 1:1, 1:2, 0:1) on the electrical conductivity of ionic liquid were investigated. The organic solvents EC and DMC have synergistic effect for the electrical conductivity of [BMIM][TFSI]-EC/DMC, and the optimal ratio of EC to DMC is 1:1, however, the organic solvents have no synergistic effect in [BMIM][TFSI]-PC/GBL. The concentration dependence of the electrical conductivity of the solution can be well fitted by empirical Casteel-Amis equation. The effects of temperature on electrical conductivity can be described by Vogel-Tamman-Fulcher (VTF) equation and Arrhenius equation. The IL concentration dependence of activation energy Ea and pre-exponential factor A in Arrhenius equation was also investigated, and fitted by empirical equations. Based on VTF equation and Arrhenius equation, a quasi-Arrhenius equation was proposed to describe the effects