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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Capacity degradation of Laves phase-related body-centered-cubic solid solution metal hydride alloys in battery
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Capacity degradation of Laves phase-related body-centered-cubic solid solution metal hydride alloys in battery

机译：电池中熔融相相中相关的身体中心立方固溶金属氢化合物的能力降解

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摘要

The nickel/metal hydride (Ni/MH) is a good example of using metal hydride alloy which is cable of reversely storing the hydrogen energy in an electrochemical environment. The failure mode of two Laves phase-related body-centered-cubic metal hydride alloys doped with Y, and Ce separately in sealed Ni/MH batteries is studied by scanning electron microscopy with x-ray energy dispersive spectroscopy and x-ray diffraction analysis. These two alloys come from a series of studies targeting toward using Ni/MH battery as a low-cost and high-durability alternative to rival Li-ion battery in the electric vehicle application. This group of alloys demonstrates a discharge capacity up to 400 mAh g(-1) under a C/4 discharge rate. The main failure mode of these two alloys is found to be selective dissolution of C14 phase which contributes to a fast increase in internal resistance. Due to the deprival of Cr from the first solidified BCC phase, the next solidified C14 phase does not have enough Cr to protect it from the KOH corrosion. Rapid quench fabrication method and addition of other corrosion-resistant non-BCC former, such as Cu, Pd, and Hf, in the alloy composition are suggested. (C) 2019 Elsevier B.V. All rights reserved.
机译：镍/金属氢化物（Ni / MH）是使用金属氢化物合金的一个很好的例子，其是在电化学环境中反向储存氢能的电缆。在密封的镍/氢电池分别掺杂有Y，和Ce 2 Laves相相关的体心立方金属氢化物合金的失效模式是通过扫描电子显微镜用X射线能量色散谱和X射线衍射分析法研究。这两种合金来自一系列研究，该研究旨在使用Ni / MH电池作为电动车辆应用中的竞争对手锂离子电池的低成本和高耐久性的替代品。该组合合金在C / 4放电率下显示出高达400mAhg（-1）的放电容量。发现这两个合金的主要故障模式是C14相的选择性溶解，其有助于内阻的快速增加。由于来自第一凝固的BCC阶段的Cr的脱落，下一个固化的C14相没有足够的Cr来保护其免受KOH腐蚀。建议提出了在合金组合物中的快速淬火制造方法和添加其他耐腐蚀非BCC以前的耐腐蚀性非BCC成形剂，例如Cu，Pd和Hf。 （c）2019 Elsevier B.v.保留所有权利。

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