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DY: Fachverband Dynamik und Statistische Physik
DY 73: Poster: Networks, Chimera, Energy Systems
DY 73.9: Poster
Donnerstag, 15. März 2018, 15:30–18:00, Poster A
Avoiding coion trapping in nanoporous supercapacitors — Konrad Breitsprecher1, •Svyatoslav Kondrat2 und Christian Holm1 — 1Institute for Computational Physics, Stuttgart — 2Institute of Physical Chemistry, Warsaw
Nanoporous supercapacitor have attracted much attention recently 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 molecular dynamics simulation study of a slit-pore capacitor system, [1] we focus on the physics and optimization of charge/discharge cycles. We will see that step-voltage charging is slow because the coions become trapped in narrow pores of supecapacitor electrodes. To avoid such trapping, a slow voltage-sweep charging is considered, which allows to accelerate the overall charging process substantially. However, we will demonstrate that a step-voltage, rather than sweeping, is preferable for fast discharging. Based on these results we will propose an optimal charge/discharge cycle.
[1] The effect of finite pore length on ion structure and charging (https://doi.org/10.1063/1.4986346)