Phase structure and electrochemical properties of Ml1−xMgxNi2.78Co0.50Mn0.11Al0.11 hydrogen storage alloys
Phase structure and electrochemical properties of Ml1−xMgxNi2.78Co0.50Mn0.11Al0.11 hydrogen storage alloys
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DOI：
10.1007/s10800-006-9241-9
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发表时间：
2007-01
影响因子：
2.9
通讯作者：
Z. Zhang;S. M. Han;W. Guan;Y. Li;Y. W. Liu;Q. Tong;T. Jing
中科院分区：
文献类型：
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作者：
Z. Zhang;S. M. Han;W. Guan;Y. Li;Y. W. Liu;Q. Tong;T. Jing
研究了Mg含量对Ml 1 −xMgxNi2.78Co0.50Mn0.11Al0.11（x= 0.05，0.10，0.20，0.30）贮氢合金相结构和电化学性能的影响。X射线衍射结果表明，所有合金均由主相（La，Mg）Ni 3和第二相LaNi 5组成。随着x的增加，（La，Mg）Ni 3相的相对含量逐渐增加，合金电极的最大容量和低温放电性能先增大后减小。当x = 0.20时，合金电极在293 K和233 K的放电容量分别达到363 mAh g-1和216 mAh g-1。合金电极的高倍率放电性能随x的增加而提高。当放电电流密度为1200 mA g-1时，随着x从0.05增加到0.30，合金电极的高倍率放电性能从22.0%增加到50.4%。电极的循环稳定性随着镁含量的增加而逐渐降低。
The effect of magnesium content on the phase structure and electrochemical properties of Ml1−xMgxNi2.78Co0.50Mn0.11Al0.11(x= 0.05, 0.10, 0.20, 0.30) hydrogen storage alloys was investigated. The results of X-ray diffraction reveal that all the alloys consist of the major phase (La, Mg)Ni3and the secondary phase LaNi5. With increase inx, the relative content of the (La, Mg)Ni3phase increases gradually, and the maximum capacity and low temperature dischargeability of the alloy electrodes first increase and then decrease. Whenxis 0.20, the discharge capacity of the alloy electrode reaches 363 mAh g−1at 293 K and 216 mAh g−1at 233 K, respectively. The high rate dischargeability of the alloy electrodes increases with increase inx. When the discharge current density is 1200 mA g−1, the high rate dischargeability of the alloy electrodes increases from 22.0% to 50.4% withxincreasing from 0.05 to 0.30. The cycling stability of the electrodes decreases gradually with increase in magnesium content.