A model of large volumetric capacitance in graphene supercapacitors based on ion clustering

Details A model of large volumetric capacitance in graphene supercapacitors based on ion clustering A model of large volumetric capacitance in graphene supercapacitors based on ion clustering

2011-09-05

arxiv.org/abs/1109.0978v2

Phys. Rev. B 84, 235133 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 5 figures; additional discussion and supporting calculations added

Scientific paper

10.1103/PhysRevB.84.235133

Electric double layer supercapacitors 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 supercapacitors due to its high conductivity and large surface area. In this paper we consider supercapacitor electrodes made from a stack of graphene sheets with randomly-inserted "spacer" molecules. We show that the large volumetric capacitances C > 100 F/cm^3 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.

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