Simulations of nanoporous supercapacitor operation

Name: Simulations of nanoporous supercapacitor operation
Published: 2016-01-01T00:00:00Z
License: https://ora.ox.ac.uk/terms_of_use

Documentation:: These data were created for the paper: "Capacitance-Power-Hysteresis Trilemma in Nanoporous Supercapacitors" by AA Lee, D Vella, A Goriely and S Kondrat, Phys Rev X 6 (2016). The data set contains the results of the Monte-Carlo simulations used to generate the plots in the above paper.

Related item:: Capacitance-Power-Hysteresis Trilemma in Nanoporous Supercapacitors
Description:: Capacitance-Power-Hysteresis Trilemma in Nanoporous Supercapacitors. Nanoporous supercapacitors are an important player in the field of energy storage that fill the gap between dielectric capacitors and batteries. The key challenge in the development of supercapacitors is the perceived trade-off between capacitance and power delivery. Current efforts to boost the capacitance of nanoporous supercapacitors focus on reducing the pore size so that they can only accommodate a single layer of ions. However, this tight packing compromises the charging dynamics and hence power density. We show via an analytical theory and Monte Carlo simulations that charging is sensitively dependent on the affinity of ions to the pores, and that high capacitances can be obtained for ionophobic pores of widths significantly larger than the ion diameter. Our theory also predicts that charging can be hysteretic with a significant energy loss per cycle for intermediate ionophilicities. We use these observations to explore the parameter regimes in which a capacitance-power-hysteresis trilemma may be avoided.

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