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Issue
Korean Journal of Chemical Engineering,
Vol.26, No.3, 770-774, 2009
Physical and electrochemical properties of lithium-doped 1-butyl-3-methylimidazolium salts
Kim KS
Two well known room temperature ionic liquids (RTILs), 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF4]) and 1-butyl-3-methylimidazolium iodide ([BMIm][I]), were synthesized. Their physical properties such as reflective indices, densities, viscosities, heat capacities, and heats of dilution were measured. The overall properties of [BMIm][BF4] obtained after two-step reactions were superior to those of the IL with a halide anion. The incorporation of lithium ions using lithium tetrafluoroborate (LiBF4) in each IL was carried out and ionic conductivities as a function of temperature and Li ion concentration were investigated. The isothermal conductivity graph showed a parabolic curve shape suggesting that the maximum values exist at a specific concentration condition while they continuously increased as the temperature increased. The conductivities reached as high as 10^(-3) S·cm-1.
Keywords: Physical Properties; Electrochemical Properties; Ionic Liquid; Li-doped Ionic Liquids
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