Low-Co rare-earth-based hydrogen storage alloy

来源期刊：中国有色金属学报(英文版)2000年第5期

论文作者：李全安 桑革 李建文 陈云贵 涂铭旌 李宁

文章页码：660 - 665

Key words：low-Co hydrogen storage alloy; metal hydride electrode; rare-earth alloy; electrochemical property; Ni—MH battery

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.