【摘要】 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。更多还原

【Abstract】 For improving the electrode characteristics of the Zr-based AB 2 -type alloy,a new kind of composite h ydrogen storage alloy was successfully prep ared by ball-milling Zr 0.9 Ti 0.1 (Ni 0.50 Mn 0.35 V 0.15 ) 2 (represented as AB 2 )with a rare earth-based AB 5 -type alloy(represented as AB 5 )which worked as a surface modifier.E ffects of ball-milling on the electrode characteristics and microstructure of Zr 0.9 Ti 0.1 (Ni 0.50 Mn 0.35 V 0.15 ) 2 alloy and mixtures of AB 2 with AB 5 alloy were investigated.After milling th e mixed AB 2 and AB 5 powders(9∶1in mass ratio)for 10min,XRD and SEM analysis showed that AB 2 and AB 5 maintained their original crystall ine states,respectively,some AB 5 particles were adhered onto the surface of AB 2 ,and some fresh surfaces were formed.It was found that the activation cycles of AB 2 -AB 5 composite alloy was shortened from 14to 7and the maximum discharge capacity was increased from330mAh ·g -1 to 347mAh ·g -1 as compared with AB 2 alloy.The discharge rate capability of AB 2 alloy was also improved by ball milling AB 2 with AB 5 alloy process.The combined effect of ball-milling and mixing with AB 5 alloy is superior to that of sole treatment .It was believed that AB 5 alloy works not only as a regular hydr ogen storage alloy,but also as a surface modifier to catalyze the hydriding /dehydrid ing process of AB 2 alloy.更多还原