Author:
Goodenough J.B.,Lee Hee Y.,Manivannan V.
Abstract
ABSTRACTComparisons 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.
Publisher
Springer Science and Business Media LLC
Reference10 articles.
1. 10. Lee Hee Y. , Manivannan V. , and Goodenough J.B. , unpublished
2. 9. Goodenough J.B. and Manivannan V. , Kagaku Denki , The Electrochemical Society of Japan (in press)
3. The crystal structure of ThTi2O6 (brannerite)
4. Keggin‐Type Heteropolyacids as Electrode Materials for Electrochemical Supercapacitors
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