AB_5型球形合金粉的表面处理研究  

Study of Surface Treatment for Gas-atomized AB_5 Alloy Powder

作　　者：宏存茂[1] 杨敬武[1] 杨勇 宏亮 

机构地区：[1]北京大学化学系,北京100871

出　　处：《物理化学学报》1998年第2期154-157,共4页Acta Physico-Chimica Sinica

基　　金：国家863基金

摘　　要：由雾化（Gas－atomization）技术制备的AB5型球形合金粉，作为镍氢电池负极材料具有很多优点：粉粒呈球状便于在多孔基片内装填；耐压耐磨性好；抗碱能力强且不易解胶．但它的电化学初活性差，难于活化．有碍电池中的应用．采用适宜的氧化剂（铜盐水溶液）处理，使球粒表面形成一个富铜、富镍亚层，显著地改善了合金粉的电化学活性．经处理的MlNi3.8CO0.5Mn0.3Al0.4球形合金粉，仅3次充放电循环其放电量便可达到240mA·h·g-1；而未经处理的同一合金粉即便经6次充放电循环其放电量也只有103mA·h·g-1．The AB_5 alloy powders prepared by gas-atomization have many advantages: sphericalparticles convenient for packing. high press and wear resistance, enhanced corrosion and dispersion resistance. But lack of electrochemical activity is a barrier for use in Ni-MH battery. Anactivation method have been carried out in our laboratory. The gas-atomized powder was treatedby an oxidizer (a solution of copper salt) to form a Cu and Ni-rich layer on the surface of theparticles. The activity of the gas-atomized powder was greatly improved. For the treated powderMINi3.8Co0.5Mn0.3Al0.4, it was found that the discharge capacity after 3 cycles of charge-dischargereached an ideal value 240mA.h.g- 1, but only 103 mA.h.g- 1 for the non-treated powder.

关 键 词：表面处理 镍氢电池 球形 合金粉 AB5型 负极材料 

分 类 号：TM911.4[电气工程—电力电子与电力传动]