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Batteries 2016, 2(2), 11; doi:10.3390/batteries2020011

Studies on Incorporation of Mg in Zr-Based AB2 Metal Hydride Alloys

1
Department of Mechanical Engineering, Wayne State University, Detroit, MI 48202, USA
2
Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA
3
BASF/Battery Materials-Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Hua Kun Liu
Received: 21 February 2016 / Revised: 26 March 2016 / Accepted: 6 April 2016 / Published: 14 April 2016
(This article belongs to the Special Issue Nickel Metal Hydride Batteries)
View Full-Text   |   Download PDF [2140 KB, uploaded 23 May 2016]   |  

Abstract

Mg, the A-site atom in C14 (MgZn2), C15 (MgCu2), and C36 (MgNi2) Laves phase alloys, was added to the Zr-based AB2 metal hydride (MH) alloy during induction melting. Due to the high melting temperature of the host alloy (>1500 °C) and high volatility of Mg in the melt, the Mg content of the final ingot is limited to 0.8 at%. A new Mg-rich cubic phase was found in the Mg-containing alloys with a small phase abundance, which contributes to a significant increase in hydrogen storage capacities, the degree of disorder (DOD) in the hydride, the high-rate dischargeability (HRD), and the charge-transfer resistances at both room temperature (RT) and −40 °C. This phase also facilitates the activation process in measurement of electrochemical discharge capacity. Moreover, through a correlation study, the Ni content was found to be detrimental to the storage capacities, while Ti content was found to be more influential in HRD and charge-transfer resistance in this group of AB2 metal hydride (MH) alloys. View Full-Text
Keywords: metal hydride (MH); nickel/metal hydride (Ni/MH) battery; Laves phase alloy; Mg addition; electrochemistry; pressure concentration isotherm metal hydride (MH); nickel/metal hydride (Ni/MH) battery; Laves phase alloy; Mg addition; 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

Chang, S.; Young, K.-H.; Ouchi, T.; Meng, T.; Nei, J.; Wu, X. Studies on Incorporation of Mg in Zr-Based AB2 Metal Hydride Alloys. Batteries 2016, 2, 11.

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