TY - JOUR
T1 - Ionic conductivity and diffusion in lithium tetrafluoroborate-doped 1-methyl-3-pentylimidazolium tetrafluoroborate ionic liquid
AU - Wu, Tzi Yi
AU - Hao, Lin
AU - Kuo, Chung Wen
AU - Lin, Yuan Chung
AU - Su, Shyh Gang
AU - Kuo, Ping Lin
AU - Sun, I. Wen
PY - 2012/3
Y1 - 2012/3
N2 - Ion transport processes in mixtures of 1-methyl-3-pentylimidazolium tetrafluoroborate ([MPI][BF 4]) and lithium tetrafluoroborate (LiBF 4) 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][BF 4] and LiBF 4-doped [MPI][BF 4] 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 LiBF 4 in LiBF 4-doped [MPI][BF 4]. The correlation between ionic conductivity and viscosity is based on the classical Walden rule, the α values of neat [MPI][BF 4] and LiBF 4-doped [MPI][BF 4] calculated from the slopes of the Walden plots are compared to those calculated from the ratio of activation energies for viscosity and molar conductivity (E a,Λ/E a,η). The comparison of activation energies of the reciprocal of viscosity, the ionic conductivity, and individual ion diffusion against the LiBF 4 concentration is also studied.
AB - Ion transport processes in mixtures of 1-methyl-3-pentylimidazolium tetrafluoroborate ([MPI][BF 4]) and lithium tetrafluoroborate (LiBF 4) 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][BF 4] and LiBF 4-doped [MPI][BF 4] 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 LiBF 4 in LiBF 4-doped [MPI][BF 4]. The correlation between ionic conductivity and viscosity is based on the classical Walden rule, the α values of neat [MPI][BF 4] and LiBF 4-doped [MPI][BF 4] calculated from the slopes of the Walden plots are compared to those calculated from the ratio of activation energies for viscosity and molar conductivity (E a,Λ/E a,η). The comparison of activation energies of the reciprocal of viscosity, the ionic conductivity, and individual ion diffusion against the LiBF 4 concentration is also studied.
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M3 - Article
AN - SCOPUS:84863244752
SN - 1452-3981
VL - 7
SP - 2047
EP - 2064
JO - International Journal of Electrochemical Science
JF - International Journal of Electrochemical Science
IS - 3
ER -