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2009 | 115 | 1 | 247-250
Article title

The Electronic and Electrochemical Properties of the LaNi_5-Based Alloys

Content
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Languages of publication
EN
Abstracts
EN
Mechanical alloying was used to synthesize LaNi_5-type hydrogen storage materials. X-ray diffraction analysis showed that, after 30 h milling, the starting mixture of the elements was decomposed into an amorphous phase. Following the annealing in high purity argon at 700°C for 0.5 h, X-ray diffraction confirmed the formation of the CaCu_5-type structures. The nanocrystalline materials were used as negative electrodes for a Ni-MH_x battery. A partial substitution o Ni by Al or Mn in LaNi_{5-x}M_x alloy leads to an increase in discharge capacity. On the other hand, the alloying elements such as Al, Mn and Co greatly improved the cycle life of LaNi_5 material. For example, in the nanocrystalline LaNi_{3.75}Mn_{0.75}Al_{0.25}Co_{0.25} powder, discharge capacities of up to 258 mA h g^{-1} (at 40 mA g^{-1} discharge current) were measured. The band structure ab initio calculations showed that 3g sites are preferred by Al, Co, and Mn atoms in the unit cell.
Keywords
EN
Year
Volume
115
Issue
1
Pages
247-250
Physical description
Dates
published
2009-01
References
  • 1. T. Sakai, M. Matsuoka, C. Iwakura, in: Handbook on the Physics and Chemistry of Rare Earth, Vol. 21, Ed. K.A. Gschneider, Jr., L. Eyring, Elsevier Sci. B.V., Amsterdam 1995, Ch. 142, p. 135
  • 2. M. Jurczyk, M. Nowak, in: Nanostructured Materials in Electrochemistry, Ed. Eftekhari Ali, Wiley, Weinheim 2008
  • 3. L. Smardz, M. Jurczyk, K. Smardz, M. Nowak, M. Makowiecka, I. Okonska, Renewable Energy 33, 201 (2008)
  • 4. Y. Nakamura, H. Nakamura, S. Fujitani, I. Yonezu, J. Alloys Comp. 210, 299 (1994)
  • 5. J.J.G. Willems, K.H.J. Buschow, J. Less-Common Met. 129, 13 (1987)
  • 6. L. Zaluski, A. Zaluska, J.O. Ström-Olsen, J. Alloys Comp. 253-254, 70 (1997)
  • 7. K. Köpernik, H. Eschrig, Phys. Rev. B 59, 1743 (1999)
  • 8. I. Opahle, K. Köpernik, H. Eschrig, Phys. Rev. B 60, 14035 (1999)
  • 9. K. Köpernik, B. Velicky, R. Hayn, H. Eschrig, Phys. Rev. B 55, 5717 (1997)
  • 10. P. Blöchl, O. Jepsen, O.K. Andersen, Phys. Rev. B 49, 16223 (1994)
  • 11. J.P. Perdew, Y. Wang, Phys. Rev. B 45, 13244 (1992)
  • 12. J.-M. Joubert, R. Érny, M. Latroche, A. Percheron-Guégan, K. Yvon, J. Appl. Crystallogr. 31, 327 (1998)
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv115n1068kz
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