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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 62: Charged Soft Matter, Polyelectrolytes and Ionic Liquids III
CPP 62.8: Vortrag
Donnerstag, 15. März 2018, 11:30–11:45, C 243
Nonlinear Conduction in Ionic Liquids – Insights from Molecular Dynamics Simulations — •Diddo Diddens1 and Andreas Heuer1,2 — 1Helmholtz-Institut Münster, Ionics in Energy Storage (IEK-12), Forschungszentrum Jülich GmbH, Corrensstraße 46, 48149 Münster, Germany — 2Institut für physikalische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 28/30, 48149 Münster, Germany
Ionic liquids (ILs) are promising electrolyte materials for batteries or supercapacitors due to their intrinsically high density of charge carriers and their wide electrochemical stability window. With respect to electrolyte optimization, the ionic conductivity is another important key parameter. In experiments, this quantity is typically measured at rather weak electric fields, at which the conductivity itself is independent of the strength of the applied field. However, nonlinear conduction effects – typically leading to an increase of the ionic conductivity – may come into play at high electric fields [1], which in battery cells usually emerge near electrodes.
In this contribution, we employ nonequilibrium molecular dynamics simulations of ILs in order to characterize the nonlinear conduction mechanism at the molecular level. Special emphasis is put on the interplay of field-induced structural rearrangements and the emergence of nonlinear effects in the conductivity.
[1] L. N. Patro, O. Burghaus, B. Roling, Phys. Rev. Lett., 2016, 116(18), 185901