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Demonstration of a Novel Alkaline Battery Cathode Material: Periodate Salts

Published online by Cambridge University Press:  26 February 2011

Stuart Licht  and
Xingwen Yu
Stuart Licht
Affiliation:
[email protected], Umass Boston, Chemistry, 100 Morrissey Blvd., Boston, MA, 02125, United States
Xingwen Yu
Affiliation:
[email protected], University of Massachusetts Boston, Department of Chemistry, 100 Morrissey Blvd., Boston, MA, 02125, United States
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Abstract

An unusual solubility domain for KIO4 in KOH solution is observed, which is consistent with a potential use of periodate as a cathode for alkaline batteries. With increasing alkalinity, the solubility of KIO4 first increases, then drops from 2.9 M to < 10−4 M with increase from 6 to 10 M KOH. The unusual rapid transition from high to low solubility with increasing KOH is attributed to the formation of insoluble periodate complex. Accompanying the favorable low solubility in concentrated KOH is a high degree of cathodic electroactivity in accord with two electron storage: IO4− ⊒ IO3−. Low cathode salt solubility minimizes interference with the anode. Zn anode alkaline batteries are studied with KIO4 and NaIO4 cathodes, have a potential of 1.4-1.5 V and discharge to over 95% of the intrinsic 2e− charge capacity. The cathode also exhibits good quasi reversibility (rechargeability) with an alkaline metal hydride anode.

Keywords

energy-storageenergetic materialenvironmentally benign
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 973: Symposium BB – Mobile Energy , 2006 , 0973-BB04-02
Copyright
Copyright © Materials Research Society 2007

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