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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 >Degradation mechanisms of high-energy bipolar nickel metal hydride battery with AB_5 and A_2B_7 alloys
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Degradation mechanisms of high-energy bipolar nickel metal hydride battery with AB_5 and A_2B_7 alloys

机译：AB_5和A_2B_7合金对高能双极镍氢电池的降解机理

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摘要

The failure modes of nickel/metal hydride batteries made from conventional AB_5 and La-only Mg-con-taining A_2B_7 metal hydride alloys were studied at the end of 70% state-of-charge cycle life testing (reaching below 3.1 Ah capacity in a 5.5 Ah design cell) by the combination of inductively coupled plasma, scanning electron microscope. X-ray energy dispersive spectroscopy and composition mapping, and X-ray diffraction analysis. The capacity degradation of cell with AB_5 alloy was found to have been caused by the combination of metal hydride alloy oxidation and non-reversible γ-NiOOH phase formation, which was promoted by the incorporation of Al leached out from the oxidation product of the Al-containing negative electrode. In the cell with Al-free A_2B_7 alloy, the end of cycle life was the result of pulverization in the main A_2B_7 phase.
机译：在70％的荷电状态循环寿命测试结束时（在电池中达到低于3.1 Ah的容量），研究了由常规AB_5和仅含La的含Mg的A_2B_7金属氢化物合金制成的镍/金属氢化物电池的失效模式5.5 Ah设计单元）由电感耦合等离子体，扫描电子显微镜组成。 X射线能量色散光谱和成分图以及X射线衍射分析。发现金属氢化物合金的氧化和不可逆的γ-NiOOH相形成的结合导致了AB_5合金电池的容量降低，这是由于掺入从Al-5的氧化产物中滤出的Al所促进的。包含负极。在不含Al的A_2B_7合金电池中，循环寿命的结束是在A_2B_7主相中进行粉碎的结果。

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