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Effect of deep discharge on the electrochemical behavior of cobalt oxides and oxyhydroxides used as conductive additives in Ni-MH cells
Language
en
Article de revue
This item was published in
Journal of Power Sources. 2009, vol. 193, n° 2, p. 864-870
Elsevier
English Abstract
When used as conductive additive at the positive electrode of Ni-MH batteries, the Na<sub>0.6</sub>CoO<sub>2</sub> phase is converted, during the first charge, by oxidation, in a γ-hydrated cobalt oxyhydroxide, which ...Read more >
When used as conductive additive at the positive electrode of Ni-MH batteries, the Na<sub>0.6</sub>CoO<sub>2</sub> phase is converted, during the first charge, by oxidation, in a γ-hydrated cobalt oxyhydroxide, which exhibits promising performances. The behavior of these phases was studied in specific deep discharge or low potential storage conditions, through electrochemical short-circuit experiments. The evolution of the electrodes during the cycling was followed by X-ray diffraction and SEM analysis. These novel additives appear to be more efficient in these extreme conditions than the CoO or Co(OH)<sub>2</sub> additives, commonly used in industrial devices.Read less <
Italian Keywords
Alkaline batteries
Cobalt oxide
Sodium cobaltite
Deep discharge
Origin
Hal imported