Correlation between composition and electrochemical properties of metal hydride electrodes

This paper is concerned with an overview of the properties of metal hydride electrodes used for battery applications. The emphasis is on the properties of AB sub 5 electrodes but others are treated as well. The review begins with a brief discussion of the pertinent chemistry of hydrogen in metals, t...

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Bibliographic Details
Published in:Journal of alloys and compounds 1998-10, Vol.293-295, p.569-582
Main Authors: Reilly, J J, Adzic, G D, Johnson, J R, Vogt, T, Mukerjee, S, McBreen, J
Format: Article
Language:English
Online Access:Get full text
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Summary:This paper is concerned with an overview of the properties of metal hydride electrodes used for battery applications. The emphasis is on the properties of AB sub 5 electrodes but others are treated as well. The review begins with a brief discussion of the pertinent chemistry of hydrogen in metals, the properties of intermetallic hydrides and their relation to electrochemical behavior. Systematic guidelines which permit the modification of such properties for electrochemical applications are discussed. The electrochemical behaviors of certain specific AB sub 5 alloy electrodes are covered in detail, emphasizing the effects of composition changes with respect to both the A and the B components. The consequences of electrode expansion and contraction with respect to hydride formation and decomposition are discussed quantitatively. Novel alloy compositions and phases are noted and evaluated. The attractive properties of cobalt-free, non-stoichiometric AB sub 5-x electrodes are noted. Materials discussed include LaNi sub 5 and derivatives as well as derivatives of MmNi sub 5 .
ISSN:0925-8388