用快速凝固气体雾化法制备了低钴系列贮氢合金 MlNi4.3-xCoxMn0.4Al0.3(x=0.75,0.45,0.29,0.1,Ml 为富镧混合稀土) 并测试其电化学性能.气雾化法可显著提高贮氢合金电极的充-放电循环稳定性,x=0.45 时合金的循环寿命与商用铸态合金的寿命相当.最大放电容量随着 Co 含量的增加,先增大后减小,在 x=0.29 时出现极大值(304.4 mAh/g).结合循环寿命和最大放电容量两个性能指标,x=0.45 时的合金具有良好的综合电化学性能.采用 Rietveld 法(多晶衍射图形拟合法)对其精细结构进行分析,合金仍保持母合金 LaNi5 的 CaCu5 型六方晶系结构,合金的晶胞体积对其循环寿命和最大放电容量起决定作用.
Hydrogen storage alloys MlNi4.3-xCoxMn0.4Al0.3(x=0.75,0.45,0.29,0.1,Ml=mixed RE) with low content of Co were prepared by gas atomization(GA) and the electrochemical properties were measured. The results show that the charge-discharge cycle stability of the alloys can be greatly improved by GA method. The crystal stability of the alloy MlNi4.3-xCoxMn0.4Al0.3 with x=0.45 made by GA is equal to that of as-cast alloy with x=0.75. As content of Co increases, the maximum discharge capacity of as-atomized alloys increases firstly and then decreases, and reaches the maximum value 304.4 mAh/g at x=0.29. Summarily, the alloy with x=0.45 exhibits good stability and discharge capacity. The fine structure of the alloys were analyzed by the Rietveld method. It shows that the structure of the alloys is of CaCu5-type, and the cycle stability and discharge capacity of the alloys depend on the crystal cell volume.
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