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Cycling stability of La-Mg-Ni-Co type hydride electrode with Al 被引量：2

Cycling stability of La-Mg-Ni-Co type hydride electrode with Al
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摘要 The mechanism of the improvement of the cycling stability of the La-Mg-Ni-Co based hydrogen storage alloy electrode was systematically investigated. The results show that the cell volume expansion upon hydrogenation is obviously decreased after the partial substitution of Al for Ni. Therefore a decrease in the pulverization of the alloy particles is obtained, which leads to the decrease of the contact area of the fresh alloy surface with alkaline electrolyte and the increase of the charge/discharge efficiency. Moreover, the occurrence of Al in the alloy can create a dense Al oxide film on the surface of the alloy during charge/discharge cycling. This dense oxide film can prevent further oxidation of the active components in the alloy, which is believed to be the most important factor responsible for the improvement of the cycling stability of the La-Mg-Ni-Mn-Co-Al type alloy electrodes. The mechanism of the improvement of the cycling stability of the La-Mg-Ni-Co based hydrogen storage alloy electrode was systematically investigated. The results show that the cell volume expansion upon hydrogenation is obviously decreased after the partial substitution of AI for Ni. Therefore a decrease in the pulverization of the alloy particles is obtained, which leads to the decrease of the contact area of the fresh alloy surface with alkaline electrolyte and the increase of the charge/discharge efficiency. Moreover, the occurrence of Al in the alloy can create a dense Al oxide film on the surface of the alloy during charge/discharge cycling. This dense oxide film can prevent further oxidation of the active components in the alloy, which is believed to be the roust important factor responsible for the improvement of the cycling stability of the La-Mg-Ni-Mn-Co-Al type alloy electrodes.
作者 孙现众 潘洪革 高明霞 李锐 林燕 马帅
机构地区 Department of Materials Science and Engineering
出处 《中国有色金属学会会刊：英文版》 EI CSCD 2006年第1期8-12,共5页 Transactions of Nonferrous Metals Society of China
基金 Project (50131040) supported by the National Natural Science Foundation of China
关键词 La-Mg-Ni-Co 氢化物电极 铝 循环稳定性 储氢合金 NI/MH电池 Ni/MH batteries Li-Mg-Ni-Co based alloy hydrogen storage alloys, cycling stability Al substitution
分类号 TG111 [金属学及工艺—物理冶金]
  • 相关文献

参考文献18

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共引文献6

同被引文献30

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引证文献2

二级引证文献8

中国有色金属学会会刊：英文版
2006年 第1期

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