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. 20    No. 4    April 2010

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Structures and electrochemical performances of La0.75−xZrxMg0.25Ni3.2Co0.2Al0.1 (x=0−0.2) electrode alloys prepared by mel
ZHANG Yang-huan(张羊换)1, 2, ZHAO Dong-liang(赵栋梁)1, SHI Yan-chun(师颜春)1, 2,
QI Yan(祁 焱)1, GUO Shi-hai(郭世海)1, WANG Xin-lin(王新林

1. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;
2. School of Material, Inner Mongolia University of Science and Technology, Baotou 014010, China

Abstract:The La-Mg-Ni system A2B7-type electrode alloys with nominal composition La0.75−xZrxMg0.25Ni3.2Co0.2Al0.1 (x=0, 0.05, 0.1, 0.15, 0.2) were prepared by casting and melt-spinning. The influences of melt spinning on the electrochemical performances as well as the structures of the alloys were investigated. The results obtained by XRD, SEM and TEM show that the as-cast and spun alloys have a multiphase structure, consisting of two main phases (La, Mg)Ni3 and LaNi5 as well as a residual phase LaNi2. The melt spinning leads to an obvious increase of the LaNi5 phase and a decrease of the (La, Mg)Ni3 phase in the alloys. The results of the electrochemical measurement indicate that the discharge capacity of the alloys (x≤0.1) first increases and then decreases with the increase of spinning rate, whereas for x>0.1, the discharge capacity of the alloys monotonously falls. The melt spinning slightly impairs the activation capability of the alloys, but it significantly enhances the cycle stability of the alloys.

 

Key words: A2B7-type electrode alloy; La-Mg-Ni alloy; Ni-MH battery; melt-spinning; electrochemical performance

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

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

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