DOUIN, Myriam; GUERLOU-DEMOURGUES, Liliane; GOUBAULT, Lionel; BERNARD, Patrick; DELMAS, Claude

doi:10.1016/j.jpowsour.2009.03.031

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DOUIN, Myriam
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

GUERLOU-DEMOURGUES, Liliane
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

GOUBAULT, Lionel
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Journal of Power Sources. 2009, vol. 193, n° 2, p. 864-870

Elsevier

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When used as conductive additive at the positive electrode of Ni-MH batteries, the Na0.6CoO2 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)2 additives, commonly used in industrial devices.< Réduire

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Alkaline batteries

Cobalt oxide

Sodium cobaltite

Deep discharge

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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

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