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Investigations on the Aging Effect of Supercapacitors

Published online by Cambridge University Press:  30 August 2011

F. Parigi ,
Y. Gao ,
M. Casares ,
T. Gachovska ,
Y. S. Zhou ,
Y. F. Lu ,
D. Patterson  and
J. L. Hudgins
F. Parigi
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, U.S.A.
Y. Gao
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, U.S.A.
M. Casares
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, U.S.A.
T. Gachovska
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, U.S.A.
Y. S. Zhou
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, U.S.A.
Y. F. Lu
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, U.S.A.
D. Patterson
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, U.S.A.
J. L. Hudgins
Affiliation:
Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, U.S.A.
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Abstract

In this paper, the degradation processes of commercial supercapacitors aged at 2.7 V and 65 °C for 2000 h were studied. The crystallinity, thermal stability, and specific surface areas of the carbon electrodes of the supercapacitors were measured. Significant changes and degradations in the carbon electrodes were observed for the aged supercapacitors. New functional groups were also found on the surface of the electrodes. The degradation of the lattice structures and the reduction in the specific surface area were as well observed for the aged supercapacitors. It was suggested that the aging of supercapacitors significantly changed the electrode surface which affects considerably electrical properties and functionality of supercapacitors. We have also performed experiments which suggest that the aging effect on the electrode is not uniformly distributed through its length.

Keywords

thermogravimetric analysis (TGA)Raman spectroscopysurface reaction
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1333: Symposium M – Nanostructured Materials for Energy Storage , 2011 , mrss11-1333-m09-29
Copyright
Copyright © Materials Research Society 2011

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References

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