Electrochemical study of zinc-substituted nickel hydroxide

Cécile Tessier (1, 2) , Christiane Faure (2) , Liliane Guerlou-Demourgues (2) , Cathy Denage (2) , Georges Nabias (3) , Claude Delmas (2)

1 SAFT [Bordeaux]
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
3 ENSCM - Ecole Nationale Supérieure de Chimie de Montpellier

The electrochemical behavior of α- and β(II)-type zinc-substituted nickel hydroxides is studied during a galvanostatic cycling in a KOH electrolyte. It is shown that these materials exhibit very stable capacities during long-term cycling. When using an 8 M KOH electrolyte, the β(III)/β(II) system is stabilized, after the initial formation of γ-type phases during the first charges. The higher the amount of zinc in the starting material, the faster this stabilization occurs. The substitution of zinc for nickel is also shown to delay the formation of the γ-phase upon charge, when various KOH electrolytes, with increasing concentrations, are successively used. A model is proposed to explain these results; it is based on several processes, occurring simultaneously either via the solution or through solid-state reactions, with a partial loss of zinc. © 2002 The Electrochemical Society. All rights reserved.

Mots clés: Nickel compounds; Zinc compounds; Electrochemical electrodes

Domaines: Matériaux

Cécile Tessier, Christiane Faure, Liliane Guerlou-Demourgues, Cathy Denage, Georges Nabias, et al.. Electrochemical study of zinc-substituted nickel hydroxide. Journal of The Electrochemical Society, 2002, 149 (9), pp.A1136-A1145. ⟨10.1149/1.1495496⟩. ⟨hal-00817914⟩