Journal
JOURNAL OF POWER SOURCES
Volume 174, Issue 1, Pages 186-190Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2007.07.078
Keywords
nickel(III) oxyhydroxide; self-discharge; oxygen evolution
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The rate constants for the self-discharge of the cathode material nickel(Ill) oxyhydroxide (NiOOH) in an alkaline medium are determined using a galvanostatic titration technique. By examination of a number of common graphite materials used in battery cathodes it is found that both the type and the amount of graphite present in the electrode influence the self-discharge rate. Two competing self-discharge phenomena exist, namely, reaction of NiOOH with surface active sites on the graphite, as well as the graphite catalyzing oxygen evolution. Their respective contributions to the overall self-discharge are evaluated. (c) 2007 Elsevier B.V. All rights reserved.
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