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A universal equivalent circuit for carbon-based supercapacitors

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journal contribution
posted on 05.11.2014, 14:56 by Stephen Fletcher, Victoria J. Black, Iain Kirkpatrick
A universal equivalent circuit is proposed for carbon-based supercapacitors. The circuit, which actually applies to all porous electrodes having non-branching pores, consists of a single vertical ladder network in series with an RC parallel network. This elegant arrangement explains the three most important shortcomings of present-day supercapacitors, namely open circuit voltage decay, capacitance loss at high frequency, and voltammetric distortion at high scan rate. It also explains the shape of the complex plane impedance plots of commercial devices and reveals why the equivalent series capacitance increases with temperature. Finally, the construction of a solid-state supercapacitor simulator is described. This device is based on a truncated version of the universal equivalent circuit, and it allows experimenters to explore the responses of different supercapacitor designs without having to modify real supercapacitors.

Funding

This work was sponsored by the EPSRC (UK) Grant Number EP/I02123X/1 (Battery/Supercapacitor Hybrids for Transport Energy Storage).

History

School

  • Science

Department

  • Chemistry

Published in

Journal of Solid State Electrochemistry

Volume

18

Issue

5

Pages

1377 - 1387

Citation

FLETCHER, S., BLACK, V.J. and KIRKPATRICK, I., 2014. A universal equivalent circuit for carbon-based supercapacitors. Journal of Solid State Electrochemistry, 18 (5), pp. 1377 - 1387.

Publisher

Springer

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 3.0 Unported (CC BY 3.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/

Publication date

2014

Notes

This article is distributed under the terms of the Creative Commons Attribution 3.0 License (http://www.creativecommons.org/licenses/by/3.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed

ISSN

1432-8488

Language

en