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Electrochemical Properties of LaNi5–xGex Alloys in Ni-MH Batteries

Witham, C. and Hightower, A. and Fultz, B. and Ratnakumar, B. V. and Bowman, R. C., Jr. (1997) Electrochemical Properties of LaNi5–xGex Alloys in Ni-MH Batteries. Journal of the Electrochemical Society, 144 (11). pp. 3758-3764. ISSN 0013-4651. http://resolver.caltech.edu/CaltechAUTHORS:WITjes97

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Abstract

Electrochemical studies were performed on LaNi5–xGex metal hydride alloys with 0 <= x <= 0.5. We carried out single-electrode studies to understand the effects of the Ge substituent on the hydrogen absorption characteristics, the electrochemical capacity, and the electrochemical kinetics of hydrogen absorption and desorption. The electrochemical characteristics of the Ge-substituted alloys are compared to those of the Sn-substituted alloys reported earlier. LaNi5–xGex alloys show compositional trends similar to LaNi5–xSnx alloys, but unlike the Sn-substituted alloys, Ge-substituted alloys continue to exhibit facile kinetics for hydrogen absorption/desorption at high solute concentrations. Cycle lives of LaNi5–xGex electrodes were measured in 300 mAh laboratory test cells and were found to be superior to the Sn-substituted LaNi5 and comparable to a Mm(Ni,Co,Mn,Al)5 alloy. The optimum Ge content for LaNi5–xGex metal hydride alloys in alkaline rechargeable cells is in the range 0.4 <= x <= 0.5.


Item Type:Article
Additional Information:©1997 The Electrochemical Society, Inc. Manuscript submitted March 31, 1997; revised manuscript received June 10, 1997. This work was carried out at the Jet Propulsion Laboratory under contract with the National Aeronautics and Space Administration and at the California Institute of Technology under funding by the U.S. Department of Energy under Grant DE-FG03-94ER14493. California Institute of Technology assisted in meeting the publication costs of this article.
Subject Keywords:electrochemical devices; lanthanum compounds; nickel compounds; germanium compounds; electrochemical electrodes
Record Number:CaltechAUTHORS:WITjes97
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:WITjes97
Alternative URL:http://dx.doi.org/10.1149/1.1838087
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2994
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:10 May 2006
Last Modified:26 Dec 2012 08:52

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