Effect of AB₅ alloy on electrochemical properties of Mm_0.80Mg_0.20Ni_2.56Co_0.50Mn_0.14Al_0.12 hydrogen storage alloy

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• 作者：HongXia Huang^a ; ^{hhx_hunan@yahoo.com.cn} ; KeLong Huang^b
• 关键词：Hydrogen storage alloy ; AB3-type alloy ; AB5-type alloy ; Electrochemical properties
• 刊名：Powder Technology
• 出版年：2012
• 期刊代码：144_00325910
• 类别：et
• 出版时间：May, 2012
• 卷：221
• 期：Complete
• 页码：365-370
• 文件大小：1589 K

摘要

The La-Mg-Ni based composites Mm_0.80 Mg_0.20Ni_2.56Co_0.50Mn_0.14Al_0.12- m>xm> wt.%AB₅ (m>xm> = 0, 10, 20, 30) alloys were successfully synthesized by ball milling method. The structure and electrochemical characteristics of composites have been investigated systematically. The XRD spectroscopy shows that all these composites are mainly composed of La₂Ni₇ phase and LaNi₅ phase. The electrochemical studies suggest that the maximum discharge capacity (m>Cm>_max) of alloy electrodes decreases slightly from 361.8 mAh/g (m>xm> = 0) to 337.9 mAh/g (m>xm> = 10), 353.9 mAh/g (m>xm> = 20) and 352.8 mAh/g (m>xm> = 30), while the cycle durability of the composite electrodes is significantly improved. Moreover, the electrochemical kinetic measurements indicate that the m>xm> = 20 composite alloy electrode presents the best overall electrochemical properties.