Issue 4, 1999

Oxidation mechanism of cobalt hydroxide to cobalt oxyhydroxide

Abstract

Although cobalt hydroxide is currently added to Ni(OH) 2 paste to prepare nickel composite electrodes used in Ni-based rechargeable alkaline batteries, its redox chemistry in alkaline media is still poorly documented. The Co(OH) 2 →CoOOH oxidation reaction in KOH media was investigated, and found to be dependent upon the experimental conditions, namely, temperature, oxidizing agent and reaction time. In addition, this reaction was shown, as determined by means of X-ray diffraction, electronic microscopy and atomic absorption measurements, to occur through a two step mechanism process involving first a dissolution process followed by a solid state reaction. This dissolution step enables preparation, by adjusting the cycling conditions, of cobalt oxyhydroxide with well defined morphology and texture, thereby providing an opportunity to optimize its efficiency as an additive in nickel electrodes.

Article information

Article type
Paper

J. Mater. Chem., 1999,9, 955-960

Oxidation mechanism of cobalt hydroxide to cobalt oxyhydroxide

V. Pralong, A. Delahaye-Vidal, B. Beaudoin, B. Gérand and J-M. Tarascon, J. Mater. Chem., 1999, 9, 955 DOI: 10.1039/A807689H

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Spotlight

Advertisements