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Sn-Substituted LaNi5 Alloys For Metal Hydride Electrodes

Published online by Cambridge University Press:  15 February 2011

Margot L. Wasz ,
Ricardo B. Schwarz ,
Supramaniam Srinivasan  and
M. P. Sridhar Kumar
Margot L. Wasz
Affiliation:
Los Alamos National Laboratory, Center for Materials Science, Los Alamos, NM 87545
Ricardo B. Schwarz
Affiliation:
Los Alamos National Laboratory, Center for Materials Science, Los Alamos, NM 87545
Supramaniam Srinivasan
Affiliation:
Los Alamos National Laboratory, Center for Materials Science, Los Alamos, NM 87545
M. P. Sridhar Kumar
Affiliation:
Texas A&M University, Center for Electrochemical Systems and Hydrogen Research, College Station, TX 77843-3402
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Abstract

Our research examines the efficacy of tin additions to LaNi5 in improving the hydrogen storage capacity of the material during charging/discharging. Alloys were prepared using high energy ball milling (mechanical alloying), a technique superior to arc casting for alloying elements with a wide disparity in melting points. Characterization by x-ray diffraction and Rietveld analysis shows that tin preferentially occupies the Ni(3g) sites in the LaNi5 structure, and the unit cell volume increases linearly with tin content to the maximum tin solubility of 7.33 atomic percent (LaNi4.56Sn0.44). We found that powders prepared by mechanical alloying and not exposed to air require no activation to induce hydrogen absorption. The hydrogen storage capacity in the gas and electrochemical phase was measured as a function of tin content. We found that with increasing tin, the plateau pressure decreases logarithmically, whereas the hydrogen storage capacity decreases linearly.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 393: Symposium W – Materials for Electrochemical Energy Storage and Conversion , 1995 , 237
Copyright
Copyright © Materials Research Society 1995

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References

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