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用快速凝固气体雾化法制备了低钴系列贮氢合金MlNi4 .3 -xCoxMn0 .4 Al0 .3 (x =0 75 ,0 45 ,0 2 9,0 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 2 9时出现极大值 (30 4 4mAh/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
Low cobalt series hydrogen storage alloy MlNi4.3-xCoxMn0.4Al0.3 (x = 0 75, 0 45, 0 2 9,0 1, Ml is a lanthanum rich mixed rare earth) was prepared by rapid solidification gas atomization method and tested Its electrochemical properties. The gas atomization method can significantly improve the charge-discharge cycle stability of the hydrogen storage alloy electrode, and the cycle life of the alloy at x = 0 45 is comparable to that of commercial as-cast alloys. The maximum discharge capacity first increases and then decreases with the increase of Co content, and the maximum value (30 4 4mAh / g) appears at x = 0 2 9. Combining the two performance indexes of cycle life and maximum discharge capacity, the alloy with x = 0 45 has good electrochemical performance. The Rietveld method (polycrystalline diffraction pattern fitting method) to analyze its fine structure, the alloy still retains the mother alloy LaNi5 CaCu5 hexagonal structure, the unit cell volume of its cycle life and maximum discharge capacity play a decisive role