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为了改善Zr基AB2-型贮氢合金的电极性能,本文选择稀土基AB5型贮氢合金作为表面改性剂,将Zr0.9Ti0.1(Mn0.35Ni0.50V0.15)2(简称AB2)合金与稀土基AB5型合金(简称AB5)进行混合和球磨处理,制备了AB2-AB5新型复合贮氢合金。研究了球磨对AB2合金及其与AB5合金的混合合金电极性能和微观结构的影响。XRD和SEM分析表明,对AB2-10mass%AB5混合合金球磨10min后,AB2和AB5合金仍保持原来的晶体结构,但是生成了许多新鲜表面的同时,一些AB5粒子被粘附在AB2粒子表面。与AB2合金相比,AB2-AB5复合合金的活化周期从14周减少到7周,最大放电容量从330mAh·g-1增加到347mAh·g-1,其倍率放电性能也得到改善。球磨及AB2与AB5合金混合的共同作用显著改善了AB2合金的电极性能。这是因为AB5合金不仅本身贮氢,而且对AB2合金氢化物的生成和分解有催化作用。
In order to improve the electrode properties of Zr-based AB2-type hydrogen storage alloy, rare earth-based AB5 hydrogen storage alloy was chosen as the surface modifier. The Zr0.9Ti0.1 (Mn0.35Ni0.50V0.15) 2 (AB2) alloy AB2-AB5 composite hydrogen storage alloy was prepared by mixing and ball milling with rare-earth AB5 type alloy (AB5 for short). The effects of ball milling on the properties and microstructure of AB2 alloy and its alloy with AB5 alloy were studied. XRD and SEM analysis showed that the AB2 and AB5 alloys retained the original crystal structure after ball milling with AB2-10mass% AB5 alloy for 10min, but many fresh surfaces were formed and some AB5 particles adhered to the surface of AB2 particles. Compared with AB2 alloy, AB2-AB5 alloy activation cycle reduced from 14 weeks to 7 weeks, the maximum discharge capacity increased from 330mAh · g-1 to 347mAh · g-1, the rate discharge performance also improved. Ball milling and the combination of AB2 and AB5 alloys significantly improve the electrode properties of the AB2 alloy. This is because AB5 alloy not only stores hydrogen itself, but also catalyzes the formation and decomposition of AB2 alloy hydride.