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Batteries 2017, 3(3), 28; doi:10.3390/batteries3030028

Fe-Substitution for Ni in Misch Metal-Based Superlattice Hydrogen Absorbing Alloys—Part 2. Ni/MH Battery Performance and Failure Mechanisms

1
BASF/Battery Materials-Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USA
2
Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA
3
Engineering Division, Ni-MH Group, FDK Corporation, 307-2, Koyagi-Machi, Takasaki, Gunma 370-0042, Japan
*
Author to whom correspondence should be addressed.
Received: 19 July 2017 / Revised: 6 September 2017 / Accepted: 6 September 2017 / Published: 18 September 2017
(This article belongs to the Special Issue Nickel Metal Hydride Batteries 2017)
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Abstract

The electrochemical performance and failure mechanisms of Ni/MH batteries made with a series of the Fe-substituted A2B7 superlattice alloys as the negative electrodes were investigated. The incorporation of Fe does not lead to improved cell capacity or cycle life at either room or low temperature, although Fe promotes the formation of a favorable Ce2Ni7 phase. Fe-substitution was found to inhibit leaching of Al from the metal hydride negative electrode and promote leaching of Co, which could potentially extend the cycle life of the positive electrode. The failure mechanisms of the cycled cells with the Fe-substituted superlattice hydrogen absorbing alloys were analyzed by scanning electron microscopy, energy dispersive spectroscopy and inductively coupled plasma analysis. The failure of cells with Fe-free and low Fe-content alloys is mainly attributed to the pulverization of the metal hydride alloy. Meanwhile, severe oxidation/corrosion of the negative electrode is observed for cells with high Fe-content alloys, resulting in increased internal cell resistance, formation of micro-shortages in the separator and eventual cell failure. View Full-Text
Keywords: metal hydride (MH); nickel/metal hydride (Ni/MH) battery; hydrogen absorbing alloy (HAA); superlattice alloy; failure mechanism metal hydride (MH); nickel/metal hydride (Ni/MH) battery; hydrogen absorbing alloy (HAA); superlattice alloy; failure mechanism
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MDPI and ACS Style

Meng, T.; Young, K.-H.; Nei, J.; Koch, J.M.; Yasuoka, S. Fe-Substitution for Ni in Misch Metal-Based Superlattice Hydrogen Absorbing Alloys—Part 2. Ni/MH Battery Performance and Failure Mechanisms. Batteries 2017, 3, 28.

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