Study of the electro-oxidation of CoO and Co(OH)2 at 90 °C in alkaline medium
Langue
en
Article de revue
Ce document a été publié dans
Journal of Power Sources. 2008, vol. 179, n° 2, p. 837-847
Elsevier
Résumé en anglais
Cobalt is usually post-added as CoO or Co(OH)2 to nickel hydroxide at the positive electrode (nickel oxide electrode) of alkaline batteries, to form a conductive network. In the present work, we focus on the transformation ...Lire la suite >
Cobalt is usually post-added as CoO or Co(OH)2 to nickel hydroxide at the positive electrode (nickel oxide electrode) of alkaline batteries, to form a conductive network. In the present work, we focus on the transformation of CoO and Co(OH)2 phases when oxidized at 90 °C. The Co3O4 phase is the majority product of such a reaction, with CoOOH as a secondary product. It is shown that the Co3O4 phase results from the reaction of the CoOOH phase, formed by electrochemical oxidation of Co(OH)2, with Co2+ species in the electrolyte, which is made possible by temperature. This process requires a global migration of the cobalt phases towards the current collector.< Réduire
Mots clés en anglais
Alkaline batteries
Cobalt oxide
Electro-oxidation
Origine
Importé de halUnités de recherche