Model of large volumetric capacitance in graphene supercapacitors based on ion clustering

Brian Skinner, M. M. Fogler, B. I. Shklovskii

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Electric double-layer supercapacitors (SCs) are promising devices for high-power energy storage based on the reversible absorption of ions into porous conducting electrodes. Graphene is a particularly good candidate for the electrode material in SCs due to its high conductivity and large surface area. In this paper, we consider SC electrodes made from a stack of graphene sheets with randomly inserted spacer molecules. We show that the large volumetric capacitances C100F/cm3 observed experimentally can be understood as a result of collective intercalation of ions into the graphene stack and the accompanying nonlinear screening by graphene electrons that renormalizes the charge of the ion clusters.

Original languageEnglish (US)
Article number235133
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number23
DOIs
StatePublished - Dec 21 2011

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