Electrochemical Studies on LaNi5–xSnx Metal Hydride Alloys

Creators: Ratnakumar, B. V.; Witham, C.; Bowman, R. C., Jr.; Hightower, A.; Fultz, B.

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Abstract

Electrochemical studies were performed on LaNi5–xSnx with 0 <= x <= 0.5. We measured the effect of the Sn substituent on the kinetics of charge-transfer and diffusion during hydrogen absorption and desorption, and the cyclic lifetimes of LaNi5–-xSnx electrodes in 250 mAh laboratory test cells. We report beneficial effects of making small substitutions of Sn for Ni in LaNi5 on the performance of the metal hydride alloy anode in terms of cyclic lifetime, capacity, and kinetics. The optimal concentration of Sn in LaNi5–xSnx alloys for negative electrodes in alkaline rechargeable secondary cells was found to lie in the range 0.25 <= x <= 0.3.

Additional Information

© 1996 The Electrochemical Society, Inc. Manuscript submitted Oct. 18, 1995; revised manuscript received April 18, 1996. This work was carried out at the Jet Propulsion Laboratory under contract with the National Aeronautics and Space Administration (NASA) and at the California Institute of Technology under funding by the Department of Energy (DOE) Grant No. DE-FG03-94ER14493. We thank NASA for providing the facilities for the electrochemical studies and DOE for support for all the authors and the Sievert's apparatus at Caltech. We thank L. A. Wade of JPL for providing samples of several alloys and Professor T. B. Flanagan of the University of Vermont, for supplying detailed results of their isotherm measurements. California Insitute of Technology assisted in meeting the publication costs of this article.

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