文档介绍：Journal of Power Sources 89Ž. 2000 117–124
aterjpowsour
An electrochemical investigation of mechanical alloying of MgNi-based
hydrogen storage alloys
Jian-Jun Jiang a,b, Michael Gasik b,)
a Faculty of Traffic Science and Engineering, Huazhong UniÕersity of Science and Technology, Wuhan 430074, People’s Republic of China
b Department of Materials Science and Rock Engineering, Helsinki UniÕersity of Technology, Espoo FIN-02015, Finland
Received 9 November 1999; received in revised form 12 February 2000; accepted 21 February 2000
Abstract
The electrochemical properties of amorphous MgNi-based hydrogen storage alloys synthesized by mechanical alloyingŽ. MA were
evaluated. The results show that these amorphous Mg50 Ni 50 alloys exhibit a higher discharge capacity and relatively good rate capacity at
a suitable grinding time while their cycle life is very poor. In order to improve the cycle life, the surface of the amorphous Mg50 Ni 50
alloy was coated with Ti, Al and Zr in Spex 8000 millrmixer and the coating effects were further investigated. Based on experimental
results, two kinds of MgNi-based amorphous alloys are designed by substituting part of Mg in MgNi-based alloys by suitable elements.
These alloys are posed of ponents. Thus, the cycle life of electrodes consisting of these quaternary amorphous alloys is
greatly improved. q 2000 Elsevier Science .