中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 10 No. 5 October 2000 |
（Department of Metal Materials, Sichuan University, Chengdu 610065, P.R.China)
Abstract:On the basis of typical high-Co MI(Lanthanum-rich mischmetal)-based hydrogen storage alloy, a series oflow-Co or Co-free alloys have been prepared by means of partial or full replacement of Co by a combination of other elements. The microstructures,p-c-T(pressure-concentration-temperature) characteristics and electrochemical propertiesunder different charge-discharge conditions of the alloys have been investigated. Compared with the high-Co alloy, thelow-Co or Co-free alloys have the lower hydrogen equilibrium pressure and discharge capacity, but have the nearly samehigh-rate and high temperature discharge capability, and better charge-discharge cycling stability. The reason is revealedby SEM, XPS and XRD results.）
Abstract:On the basis of typical high-Co MI(Lanthanum-rich mischmetal)-based hydrogen storage alloy, a series oflow-Co or Co-free alloys have been prepared by means of partial or full replacement of Co by a combination of other elements. The microstructures,p-c-T(pressure-concentration-temperature) characteristics and electrochemical propertiesunder different charge-discharge conditions of the alloys have been investigated. Compared with the high-Co alloy, thelow-Co or Co-free alloys have the lower hydrogen equilibrium pressure and discharge capacity, but have the nearly samehigh-rate and high temperature discharge capability, and better charge-discharge cycling stability. The reason is revealedby SEM, XPS and XRD results.
Key words: low-Co hydrogen storage alloy; metal hydride electrode; rare-earth alloy; electrochemical property; Ni—MH battery
