BPCPPDYSOE21 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 16: Charged Soft Matter - organized by Joachim Dzubiella (Albert Ludwigs University Freiburg, Freiburg)
CPP 16.1: Hauptvortrag
Mittwoch, 24. März 2021, 09:00–09:40, CPPa
Charging Dynamics and Structure of Ionic Liquids in Nanoporous Supercapacitors — •Christian Holm1, Konrad Breitsprecher1, and Svyatoslav Kondrat2,3 — 1University of Stuttgart, Institute for Computational Physics, Stuttgart, Germany — 2Department of Complex Systems, Polish Academy of Sciences, Warsaw, Poland — 3MPI for Intelligent Systems, Stuttgart, Germany
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 et al., Nature Communications 11, 6085 (2020)