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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 69: Focus: Fundamentals of molecular liquids, ionic liquids and mixtures II
CPP 69.7: Hauptvortrag
Mittwoch, 18. März 2020, 17:00–17:30, ZEU 222
Charging Dynamics and Structure of Ionic Liquids in Nanoporous Supercapacitors — •Christian Holm1, Konrad Breitsprecher1, and Svyatoslav Kondrat2 — 1Universität Stuttgart, Institut für Computerphysik, Allmandring 3, 70569 Stuttgart — 2Department of Complex Systems, Institute of Physical Chemistry, PAS, Kasprzaka 44/52, 01-224 Warsaw, Poland
Ionic liquid based nanoporous supercapacitors have recently attracted much attention as energy storage devices with remarkable cyclability and high power and energy densities. However, their use in high-frequency applications might be limited by a relatively slow charging process. In this talk we will first discuss the fluid structure within a slit-pore capacitor system [1] and report on the physics and optimization of charge/discharge cycles [2,3]. We will see that step-voltage charging is slow because the coions become trapped in narrow pores of the supercapacitor electrodes. To avoid such trapping, a slow voltage-sweep charging is considered, which allows to accelerate the overall charging process substantially. We furthermore examine in detail the discharging process, as well. At the end we will report on the effect of nonlinear charging functions.
[1] K. Breitsprecher, M. Abele, S. Kondrat and C. Holm, J. Chem. Phys., 147, 104708 (2017).
[2] K. Breitsprecher, C. Holm, S. Kondrat, ACS nano 12 (10), 9733-9741 (2018) .
[3] K. Breitsprecher, M. Janssen, S. Kondrat, C. Holm, in preparation.