纳米晶AB_3型稀土镁基贮氢合金研究

Study on nanocrystalline rare earth Mg-based system hydrogen storage alloys with AB3-type

用双辊快淬法制备的AB3型稀土镁基贮氢合金,经X射线衍射和SEM分析表明,该贮氢合金具有纳米晶结构,由LaNi3相和LaNi5相组成.PCT测试曲线显示,贮氢合金具有合适的吸放氢平台.该贮氢合金具有比容量高、循环性能稳定的优异电性能,72 mA/g放电比容量达到369 mA.h/g,460次循环后720mA/g容量衰减仅为19.4%.

A sort of rare earth Mg-based system hydrogen storage alloys with AB3-type was prepared by double-roller rapid quenching method. The alloys were nanocrystalline structures composed of LaNi3 phase and LaNis phase by X-ray diffraction and SEM analyses, and the suitable absorption/desorption plateau was revealed by the measurement of PCT curve. Electrochemical studies indicated that the alloys exhibited good electrochemical properties such as high capacity and stable cycle life,and the discharge capacity was 369mA · h/g at 0. 2C（72mA/g） ,after 460 cycles,the capacity decay was only 19.4% at 2C（720mA/g）.