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Dissolution-Recrystallization Processes of Nickel Hydroxide, The Active Material of the Ni/CD and Ni/H2 Cells

Published online by Cambridge University Press:  16 February 2011

A. Delahaye-Vidal
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, URA CNRS 1211, 33 rue Saint-Leu, F-80039 Amiens Cedex, France
N. Sac-Epee
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, URA CNRS 1211, 33 rue Saint-Leu, F-80039 Amiens Cedex, France
F. Portemer
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, URA CNRS 1211, 33 rue Saint-Leu, F-80039 Amiens Cedex, France
B. Beaudoin
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, URA CNRS 1211, 33 rue Saint-Leu, F-80039 Amiens Cedex, France
M. Figlarz
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, URA CNRS 1211, 33 rue Saint-Leu, F-80039 Amiens Cedex, France
T. Jamin
Affiliation:
Centre National d'Etudes Spatiales (CNES), 18 Avenue Edouard Belin, F-31055 Toulouse Cedex, France
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Abstract

Several examples of dissolution-recrystallization processes at the nickel hydroxide electrode are reviewed. Some of them are very well known and have been studied for a few yearsin the case of Ni/Cd cells. The cycling of the ∝-type nickel hydroxide leads to the ∝→β transformation through dissolution of the a phase in the electrolyte (KOH) and recrystallization of the β phase from the solution. Further cycling of the resulting βex ∝phase causes an ageing effect which occursvia the solution (Oswald ripening). More recently, a strong ripening phenomenon has been observed by studying the behavior of nickel hydroxides cycling in Ni/H2 cells. By simulating the ageing of charged and discharged materials under hydrogen pressure inKOH media, it has been shown that in the absence of voltage, hydrogen cannot be responsible for the strong ripening effect. Synergetic effects between hydrogen and voltage have to be considered.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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References

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