物理化学学报 >> 1998, Vol. 14 >> Issue (02): 154-157.doi: 10.3866/PKU.WHXB19980211

研究论文 上一篇    下一篇

AB5型球形合金粉的表面处理研究

宏存茂, 杨敬武, 杨勇, 宏亮   

  1. 北京大学化学系，北京 100871
  • 收稿日期:1997-05-04 修回日期:1997-09-29 发布日期:1998-02-15
  • 通讯作者: 宏存茂

Study of Surface Treatment for Gas-atomized AB5 Alloy Powder

Hong Cun-Mao, Yang Jing-Wu, Yang Yong, Hong Liang   

  1. Department of Chemistry,Peking University,Beijing 100871
  • Received:1997-05-04 Revised:1997-09-29 Published:1998-02-15
  • Contact: Hong Cun-Mao

PDF

2573

赞

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．

关键词: 表面处理, 金属-氢化物电极

Abstract:

The AB_5 alloy powders prepared by gas-atomization have many advantages: spherical particles 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. An activation method have been carried out in our laboratory. The gas-atomized powder was treated by an oxidizer (a solution of copper salt) to form a Cu and Ni-rich layer on the surface of the particles. The activity of the gas-atomized powder was greatly improved. For the treated powder MINi3.8Co0.5Mn0.3Al0.4, it was found that the discharge capacity after 3 cycles of charge-discharge reached an ideal value 240mA.h.g- 1, but only 103 mA•h•g- 1 for the non-treated powder.

Key words: Surface treatment, Metal hydride electrode