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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 1    February 2006

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Cycling stability of La-Mg-Ni-Co type hydride
electrode with Al
SUN Xian-zhong(孙现众), PAN Hong-ge(潘洪革), GAO Ming-xia(高明霞),
LI Rui(李 锐), LIN Yan(林 燕), MA Shuai(马 帅)

Department of Materials Science and Engineering, Zhejiang University,
Hangzhou 310027, China

Abstract: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.

 

Key words: Ni/MH batteries; Li-Mg-Ni-Co based alloy; hydrogen storage alloys; cycling stability; Al substitution

ISSN 1672-7029
CN 43-1423/U

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