作　　者： ; ; ; ;

机构地区： 华南师范大学

出　　处： 《稀有金属材料与工程》 2007年第7期1287-1290,共4页

摘　　要： 用不同量的V2O5对双辊快淬法制AB5型合金La0.65Ce0.28Pr0.02Nd0.05Ni3.8Co0.7Mn0.3Al0.2进行球磨修饰,得到V2O5修饰量分别为0%,3%,6%,10%(质量分数)的4个试样。对试样进行激光粒度分析、X射线衍射物相组成分析、扫描电子显微镜微观形貌观察,用恒电流充放电研究了试样作为镍氢电池负极时的性能,用循环伏安法研究了氧化还原氢动力学性能。结果表明,V2O5修饰使合金颗粒细化,但是主相合金依然保持了单一的六方晶系的CaCu5型结构。修饰V2O5使合金的实际放电容量得到提高,最高达到332.6mAh/g,合金电极表面的氢氧化还原过程动力学性能得到改善,修饰V2O5对电极反应有催化作用,同时合金的倍率放电性能得到明显改善。 AB5-type rare-earth-based hydrogen storage alloy La0.65Ce0.28Pr0.02Nd0.05Ni3.8Co0.7Mn0.3Al0.2 was prepared by twin-roller rapid quenching process and modified with V2O5. Four samples were obtained with V2O5 contents of 0%, 3%, 6%, 10% in mass fraction, respectively. Their performances were studied with granularity distribution, X-Ray powder diffraction （XRD）, scanning electron microscopy （SEM）, charging and discharging and cyclic voltammetry. With the modification of V2O5, the particle size of AB5 alloy became smaller, but its typical single-phase hexagonal CaCu5-type structure kept unchanged. The discharge capacity increased, the kinetics properties of hydrogen process is improved and the ratio discharge capability was markedly improved.

关 键 词： 贮氢合金 容量 电化学性能 动力学性能

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]