Importance of reorientational dynamics for the charge transport in ionic liquids
2018
Most
ionic liquidscontain at least one rather
complex ionspecies exhibiting a dipolar moment. In the present work, we provide a thorough evaluation of broadband dielectric spectra of various
ionic liquidstaking into account the often neglected reorientational dynamics of these ions. We provide evidence that this dynamics leads to a clear signature in the spectra. The obtained reorientational relaxation times are well consistent with earlier inelastic light scattering and high-frequency dielectric investigations. We find a close coupling of the detected ion-rotation dynamics to the ionic charge transport. This coupling does not seem to be mediated by the viscosity but probably is of more direct nature, pointing to a
revolving-doormechanism as also considered for plastic-crystalline ionic conductors. Our results show that the reorientational motion of the dipolar ions plays a significant and so far overlooked role for the ionic charge transport in
ionic liquids.
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