Effect of Cu Power as an Additive Material on the Properties of Zr-Based Pasted Alloy Electrodes for Ni/MN Batteries

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In order to investigate the effect of Cu powder as a conducting material on electrochemical performance, Zr-Ti-Cr-V-Mn-Ni alloy electrodes were prepared by pasting and carbon black powder was replaced by Cu powder. Electrode characteristics such as discharge potential, rate capability, and low-temperature discharge improved with the addition of Cu powder. The exchange current density increased and the reaction resistance decreased with increasing amounts of Cu powder. It is believed that the catalytic activity of the electrochemical hydriding reaction on the alloy was significantly improved by the substitution of Cu powder. Based on energy dispersive spectrometry analysis, the Cu concentration on the alloy surface dramatically increased after 350 cycles. This result indicates that a thin Cu layer forms on the alloy surface during cycling via a dissolution-precipitation mechanism. It is suggested that the thin copper layer on the alloy surface improves the electronic conductivity of the electrode and facilitates the hydriding reaction. (C) 2000 The Electrochemical Society. S0013-4651(00)01-123-X. All rights reserved.
Publisher
Electrochemical Society, Inc.
Issue Date
2000
Language
English
Article Type
Article
Keywords

METAL HYDRIDE ELECTRODES; BINDING MATERIALS; BEHAVIOR

Citation

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.147, no.7, pp.2494 - 2497

ISSN
0013-4651
URI
http://hdl.handle.net/10203/68635
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