Annealing effects on structural and electrochemical properties of (LaPrNdZr)0.83Mg0.17(NiCoAlMn)3.3 alloy

被引：0
|
作者：
Li, F. [1 ]
Young, K. [1 ]
Ouchi, T. [1 ]
Fetcenko, M.A. [1 ]
机构：
[1] Energy Conversion Devices Inc., Ovonic Battery Company, 2968 Waterview Drive, Rochester Hills, MI 48309, United States
来源：
Journal of Alloys and Compounds | 2009年 / 471卷 / 1-2期
关键词：
Rare-earth magnesium nickel based alloys (La0.205Pr0.392Nd0.392Zr0.012)0.83Mg0.17Ni2.97Co0.1Al0.2Mn0.03 were studied with various annealing conditions. The phase structures of the alloys before and after electrochemical cycling were examined by x-ray diffraction and Rietveld analysis. The alloys mainly consisted of two or more phases from the group of Ce2Ni7-; CaCu5-; Ce5Co19-; or CeNi3-type phases. Phase abundance drastically changed with different annealing temperatures. As the annealing temperature increased; hydrogen storage capacity first increased and then decreased as indicated by the pressure-concentration isotherms. The electrochemical test showed a similar trend; resulting in a maximum discharge capacity which started at 339 mAh/g (1173 K); increased to 345 mAh/g (1198 K) and then decreased to 312 mAh/g (1273 K). The addition of Pr and Nd created a new AB3 phase with a CeNi3 structure after annealing; which contributed to better high rate dischargeability due to both a lower transferring resistance at the surface/electrolyte interface and a higher bulk diffusion coefficient. © 2008 Elsevier B.V. All rights reserved;
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页码：371 / 377
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