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Batteries 2016, 2(3), 25; doi:10.3390/batteries2030025

The Importance of Rare-Earth Additions in Zr-Based AB2 Metal Hydride Alloys

1
Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA
2
BASF/Battery Materials-Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USA
3
Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Andreas Jossen
Received: 28 April 2016 / Revised: 20 June 2016 / Accepted: 4 July 2016 / Published: 11 July 2016
(This article belongs to the Special Issue Nickel Metal Hydride Batteries)
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Abstract

Effects of substitutions of rare earth (RE) elements (Y, La, Ce, and Nd) to the Zr-based AB2 multi-phase metal hydride (MH) alloys on the structure, gaseous phase hydrogen storage (H-storage), and electrochemical properties were studied and compared. Solubilities of the RE atoms in the main Laves phases (C14 and C15) are very low, and therefore the main contributions of the RE additives are through the formation of the RENi phase and change in TiNi phase abundance. Both the RENi and TiNi phases are found to facilitate the bulk diffusion of hydrogen but impede the surface reaction. The former is very effective in improving the activation behaviors. −40 °C performances of the Ce-doped alloys are slightly better than the Nd-doped alloys but not as good as those of the La-doped alloys, which gained the improvement through a different mechanism. While the improvement in ultra-low-temperature performance of the Ce-containing alloys can be associated with a larger amount of metallic Ni-clusters embedded in the surface oxide, the improvement in the La-containing alloys originates from the clean alloy/oxide interface as shown in an earlier transmission electron microscopy study. Overall, the substitution of 1 at% Ce to partially replace Zr gives the best electrochemical performances (capacity, rate, and activation) and is recommended for all the AB2 MH alloys for electrochemical applications. View Full-Text
Keywords: metal hydride (MH); nickel/metal hydride (Ni/MH) battery; Laves phase alloy; rare earth (RE) element; electrochemistry; pressure concentration isotherm metal hydride (MH); nickel/metal hydride (Ni/MH) battery; Laves phase alloy; rare earth (RE) element; electrochemistry; pressure concentration isotherm
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Young, K.-H.; Ouchi, T.; Nei, J.; Moghe, D. The Importance of Rare-Earth Additions in Zr-Based AB2 Metal Hydride Alloys. Batteries 2016, 2, 25.

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