纳米晶稀土贮氢合金高倍率放电性能的研究

Study on high rate discharge properties of nanocrystalline rare earth hydrogen storage alloys

对快淬法制备的纳米晶贮氢合金的高倍率放电性能进行了研究.结果表明,该贮氢合金7C放电比容量不低于260 mA.h/g,高倍率放电率不低于90%,循环寿命大于600次;10C放电比容量不低于230 mA.h/g,高倍率放电率不低于80%,循环寿命大于500次.X射线衍射分析和金相分析结果表明,该贮氢合金呈均匀的单一CaCu5型相结构,晶粒尺寸小于50nm,为柱状晶结构.

The properties of high rate discharge on nanocrystalline rare earth hydrogen storage alloys prepared with a rapid quenching method was studied in this paper. The results were showed that the discharge specific capacity of this alloys at 7C was more than 260mA · h/g,the high rate discharge was 90% above, and cyclic life was exceeded 600 cycles. But the discharge specific capacity of those at 10C was more than 230mA · h/g,the high rate discharge was 80% above,and cyclic life exceeded 500 cycles. After structure and crystalline phase analysing, there was the homogeneous CaCu5-type phase columnar crystalline structure of the alloys, and crystalline particles were smaller than 50 nm.