| Effect of cobalt content on electrochemical performance of La-Mg-Ni system （Ce2Ni7-type） electrode alloys |
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| 引用本文： | Lü Fanxiu.Effect of cobalt content on electrochemical performance of La-Mg-Ni system （Ce2Ni7-type） electrode alloys[J].中国稀土学报(英文版),2008,26(2):284-290. |
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| 作者姓名： | Lü Fanxiu |
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| 作者单位： | WANG Xinlin（Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081,China） ;
DONG Xiaoping （School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China） ;
ZHANG Yanghuan （Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081,China;School of Materials, Inner Mongolia University of Science and Technology, Baotou 014010, China） ;
GUO Shihai （Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081,China） ;
Lü Fanxiu（School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China） ; |
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| 基金项目： | 国家自然科学基金
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内蒙古自然科学基金
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内蒙古科技计划 |
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| 摘 要： | In order to improve the cyclic stability of La-Mg-Ni system （Ce2Ni7-type） alloy electrode, small amount of Co was added in La0.75Mg0.25Ni3.5 alloy. The effect of Co on electrochemical performance and microstructure of the alloys were investigated in detail. XRD results showed that the alloys had multiphase structure composed of （La, Mg）2Ni7, LaNi5 and small amount of LaNi2 phases. The discharge capacity of the alloys first increased and then decreased with increasing Co content. At a discharge current density of 900 mA/g, the HRD of the alloy electrodes increased from 81.3% （x=0） to 89.2 % （x=0.2）, and then reduced to 87.8 % （x=0.6）. After 60 charge/discharge cycles, the capacity retention rate of the alloys enhanced from 52.67% to 61.32%, and the capacity decay rate of the alloys decreased from 2.60 to 2.05 mAh/g per cycle with increasing Co content. The obtained results by XPS and XRD showed that the fundamental reasons for the capacity decay of the La-Mg-Ni system （Ce2Ni7-type） alloy electrodes were corrosion and oxidation as well as passivation of Mg and Lain alkaline solution.
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| 关 键 词： | 钴元素 含量检测 La-Mg-Ni合金 电化学 |
| 收稿时间： | 29 October 2007 |
Effect of cobalt content on electrochemical performance of La-Mg-Ni system (Ce2Ni7-type) electrode alloys |
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| Xinlin WANG, Xiaoping DONG, Yanghuan ZHANG, Shihai GUO,Fanxiu Lü.Effect of cobalt content on electrochemical performance of La-Mg-Ni system (Ce2Ni7-type) electrode alloys[J].Journal of Rare Earths,2008,26(2):284-290. |
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| Authors: | Xinlin WANG Xiaoping DONG Yanghuan ZHANG Shihai GUO Fanxiu Lü |
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| Affiliation: | [1]Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081,China [2]School of Materials Science and Engineering, University of Science and Technology Beijing, Beifing 100083, China [3]School of Materials, Inner Mongolia University of Science and Technology, Baotou 01401 0, China |
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| Abstract: | In order to improve the cyclic stability of La-Mg-Ni system (Ce2Ni7-type) alloy electrode, small amount of Co was added in La0.75Mg0.25Ni3.5 alloy. The effect of Co on electrochemical performance and microstructure of the alloys were investigated in detail. XRD results showed that the alloys had multiphase structure composed of (La, Mg)2Ni7, LaNi5 and small amount of LaNi2 phases. The discharge capacity of the alloys first increased and then decreased with increasing Co content. At a discharge current density of 900 mA/g, the HRD of the alloy electrodes increased from 81.3% (x=0) to 89.2 % (x=0.2), and then reduced to 87.8 % (x=0.6). After 60 charge/discharge cycles, the capacity retention rate of the alloys enhanced from 52.67% to 61.32%, and the capacity decay rate of the alloys decreased from 2.60 to 2.05 mAh/g per cycle with increasing Co content. The obtained results by XPS and XRD showed that the fundamental reasons for the capacity decay of the La-Mg-Ni system (Ce2Ni7-type) alloy electrodes were corrosion and oxidation as well as passivation of Mg and La in alkaline solution. |
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| Keywords: | Co content Ce2Ni7-type La-Mg-Ni system alloy electrochemical performance rare earths system electrochemical performance content cobalt Effect alloys corrosion oxidation passivation alkaline solution fundamental reasons decay rate cycles discharge capacity retention current density increased increasing results |
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