Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 10    No. 5    October 2000

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Low-Co rare-earth-based hydrogen storage alloy①
LI Quan-an(李全安), SANG Ge(桑 革), LI Jian-wen(李建文),
CHEN Yun-gui(陈云贵), TU Ming-jing(涂铭旌), LI Ning(李 宁)

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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