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Supercapacitors and Batteries

Published online by Cambridge University Press:  15 February 2011

J.B. Goodenough ,
Hee Y. Lee  and
V. Manivannan
J.B. Goodenough
Affiliation:
Texas Materials Institute, ETC 9.102University of Texas at Austin, Austin, TX 78712-1063
Hee Y. Lee
Affiliation:
Texas Materials Institute, ETC 9.102University of Texas at Austin, Austin, TX 78712-1063
V. Manivannan
Affiliation:
Texas Materials Institute, ETC 9.102University of Texas at Austin, Austin, TX 78712-1063
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Abstract

Comparisons are made between the material requirements for supercapacitor electrodes and the cathode of a lithium-ion battery. The performances of the battery cathodes Li1+xFe2(SO4)2(PO4) and Li1+5 VMoO6 are compared to those for supercapacitor electrodes operating with 5.3 M H2SO4, Nafion 117, or 2 M KCl aqueous solution at pH 6.7. The use of a KCl aqueous electrolyte at mild pH allows stabilization of amorphous, hydrated electrode materials such as a-MnO2nH2O that are not stable in 5.3 M H2SO4 or with Nafion 117. However, the larger K+ ion appears to reduce by a factor of three the theoretical capacity attainable with H+ ions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 655
Copyright
Copyright © Materials Research Society 1999

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References

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