Electrochemical Properties of LaNi5–xGex Alloys in Ni-MH Batteries
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.
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.Attached Files
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Additional details
- Eprint ID
- 2994
- Resolver ID
- CaltechAUTHORS:WITjes97
- NASA/JPL/Caltech
- DE-FG03-94ER14493
- Department of Energy (DOE)
- Created
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2006-05-10Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field