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Bismuth Contribution to the Improvement of the Positive Electrode Performances in Ni/Cd and Ni/MH Batteries

Published online by Cambridge University Press:  18 March 2011

V. Pralong ,
A. Delahaye-Vidal ,
B. Beaudoin  and
J-M. Tarascon
V. Pralong
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, Université de Picardie Jules Verne & CNRS, 33, rue St Leu 80039 Amiens, France
A. Delahaye-Vidal
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, Université de Picardie Jules Verne & CNRS, 33, rue St Leu 80039 Amiens, France
B. Beaudoin
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, Université de Picardie Jules Verne & CNRS, 33, rue St Leu 80039 Amiens, France
J-M. Tarascon
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, Université de Picardie Jules Verne & CNRS, 33, rue St Leu 80039 Amiens, France
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Abstract

In this study we investigated the evolution of nickel hydroxide, which acts at the positive electrode of the Ni/Cd, Ni/MH and Ni/H2 alkaline batteries. We found that the addition of bismuth oxide in the course of the active material preparation prevents the dissolution-re-crystallization processes of the nickel hydroxide that are harmful to the electrode efficiency. From XRD and SEM studies, it is shown that treatment of the bismuth doped-nickel hydroxide by hydrogen in 5 N KOH electrolyte prevents metallic nickel formation. Moreover, it appears to stabilize the α-type nickel hydroxide structure, preventing its transformation into the β-Ni(OH)2 phase. Finally, an implementation of these findings towards the most efficient use of nickel positive electrodes is shown.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 658: Symposium GG – Solid-State Chemistry of Inorganic Materials III , 2000 , GG10.1
Copyright
Copyright © Materials Research Society 2001

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References

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