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Batteries 2017, 3(4), 29;

Cell Performance Comparison between C14- and C15-Predomiated AB2 Metal Hydride Alloys

Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA
BASF/Battery Materials—Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USA
Institute for Energy Technology, P.O. Box 40, Kjeller NO-2027, Norway
Institute for Energy Technology, University of Science and Technology Beijing, 30 Xueyuan Rd., Haidian Dist., Beijing 100083, China
Department of Chemical Engineering, Norwegian University of Science and Technology, Høgskoleringen 1, Trondheim NO-7491, Norway
Author to whom correspondence should be addressed.
Academic Editor: Hua Kun Liu
Received: 14 July 2017 / Revised: 17 August 2017 / Accepted: 22 August 2017 / Published: 25 September 2017
(This article belongs to the Special Issue Nickel Metal Hydride Batteries 2017)
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The performance of cylindrical cells made from negative electrode active materials of two selected AB2 metal hydride chemistries with different dominating Laves phases (C14 vs. C15) were compared. Cells made from Alloy C15 showed a higher high-rate performance and peak power with a corresponding sacrifice in capacity, low-temperature performance, charge retention, and cycle life when compared with the C14 counterpart (Alloy C14). Annealing of the Alloy C15 eliminated the ZrNi secondary phase and further improved the high-rate and peak power performance. This treatment on Alloy C15 showed the best low-temperature performance, but also contributed to a less-desirable high-temperature voltage stand and an inferior cycle stability. While the main failure mode for Alloy C14 in the sealed cell is the formation of a thick oxide layer that prevents gas recombination during overcharge and consequent venting of the cell, the failure mode for Alloy C15 is dominated by continuous pulverization related to the volumetric changes during hydride formation and hysteresis in the pressure-composition-temperature isotherm. The leached-out Mn from Alloy C15 formed a high density of oxide deposits in the separator, leading to a deterioration in charge retention performance. Large amounts of Zr were found in the positive electrode of the cycled cell containing Alloy C15, but did not appear to harm cell performance. Suggestions for further composition and process optimization for Alloy C15 are also provided. View Full-Text
Keywords: metal hydride; nickel metal hydride batteries; Laves phase alloy; electrochemistry; synergetic effects metal hydride; nickel metal hydride batteries; Laves phase alloy; electrochemistry; synergetic effects

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Young, K.-H.; Koch, J.M.; Wan, C.; Denys, R.V.; Yartys, V.A. Cell Performance Comparison between C14- and C15-Predomiated AB2 Metal Hydride Alloys. Batteries 2017, 3, 29.

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