Acta Phys. -Chim. Sin. ›› 1998, Vol. 14 ›› Issue (02): 154-157.doi: 10.3866/PKU.WHXB19980211

• ARTICLE • Previous Articles     Next Articles

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

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