Study on the reduction behavior of CoOOH during the storage of nickel/metal-hydride battery

The storage of nickel/metal-hydride (Ni-MH) battery with co-precipitated cobalt hydroxide and post-added cobalt compound as the additives for pasted Ni(OH) 2 electrode is studied in this paper by using galvanostatic charge–discharge, cyclic voltammetry and X-ray diffraction (XRD). It is shown that (...

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Bibliographic Details
Published in:Materials chemistry and physics 2006-12, Vol.100 (2), p.486-489
Main Authors: Li, Xiaofeng, Xia, Tongchi, Dong, Huichao, Wei, Yanwei
Format: Article
Language:English
Subjects:
CoOOH
Nickel/metal-hydride battery
Reduction
Storage
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Summary:The storage of nickel/metal-hydride (Ni-MH) battery with co-precipitated cobalt hydroxide and post-added cobalt compound as the additives for pasted Ni(OH) 2 electrode is studied in this paper by using galvanostatic charge–discharge, cyclic voltammetry and X-ray diffraction (XRD). It is shown that (I) capacity loss occurs only on the battery with post-added cobalt compound during the storage; (II) CoOOH derived from co-precipitated cobalt hydroxide has a better stability than the one from post-added cobalt compound and an irreversible reduction of the latter is observed; and (III) an inactive Co + 3O(OH) is obtained from Ni(OH) 2 electrode with post-added cobalt compound after the storage and should be responsible for the property deterioration of Ni-MH battery. Thus, it is important to increase the stability of CoOOH derived from post-added cobalt compound when Ni-MH battery suffers a long-term storage.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2006.01.031