Study of the electro-oxidation of CoO and Co(OH)2 at 90 °C in alkaline medium
Language
en
Article de revue
This item was published in
Journal of Power Sources. 2008, vol. 179, n° 2, p. 837-847
Elsevier
English Abstract
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 ...Read more >
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.Read less <
English Keywords
Alkaline batteries
Cobalt oxide
Electro-oxidation
Origin
Hal imported