期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 118, 期 1, 页码 129-134出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2009.07.016
关键词
A(2)B(7)-type electrode alloy; Substitution of Pr for La; Melt spinning; Microstructure; Cycle stability
资金
- Hi-Tech Research and Development Program of China [2007AA03Z227]
- National Natural Science Foundations of China [50871050, 50701011]
- Natural Science Foundation of Inner Mongolia, China [200711020703]
- High Education Science Research Project of Inner Mongolia, China [NJzy08071]
In order to improve the electrochemical cycle stability of the La-Mg-Ni system A(2)B(7)-type electrode alloys. La in the alloy was partially substituted by Pr and the melt spinning technology was used for preparing La0.75-xPrxMg0.25Ni3.2Co0.2Al0.1 (x = 0, 0.1, 0.2. 0.3, 0.4) electrode alloys The microstructures and electrochemical performances of the as-cast and spun alloys were investigated in detail The results obtained by XRD, SEM and TEM show that the as-cast and spun alloys have a multiphase Structure which consists of two main phases (La, Mg)Ni-3 and LaNi5 as well as a residual phase LaNi2. The Substitution of Pr for La leads to an obvious increase of the (La, Mg)Ni-3 phase and a decrease of the LaNi5 phase in the alloys The results of the electrochemical measurement indicate that the cycle stability of the alloy monotonously rises with increasing Pr content When Pr content rises from 0 to 0.4, the capacity retaining rate after 100 cycles increases from 65.32 to 79.36% for the as-cast alloy, and from 73.97 to 93.08% for as-spun (20 m s(-1)) alloy. The melt spinning significantly improves the cycle stability of the alloys When the spinning rate grows from 0 (as-cast was defined as spinning rate of 0 m s(-1)) to 20 m s(-1), the capacity retaining rate after 100 cycles increases from 65.32 to 73.97% for the (x = 0) alloy, and from 79.36 to 93.08% for the (x = 0.4) alloy (c) 2009 Elsevier B.V. All rights reserved
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