Role of intermetallics in hydrogen storage materials

M. Okada, T. Kuriiwa, A. Kamegawa, H. Takamura

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

Many intermetallics such as AB5, AB2, A2B show the excellent hydrogen absorbing properties. Specially, LaNi5 compound has been extensively studied for the negative electrode of Ni-MH batteries. In today's use for the negative electrode of Ni-MH batteries, alloys must be single phase. But it is well known that it is difficult to make non-stoichiometric LaNi5 alloys as single phase because of its limited solid-solution range. The present study describes the rapid quenching effects on the solid-solution range of La(Ni, M)x (x = 3-5) alloys prepared by melt spinning in discussing their hydrogen absorption properties. It is found that the single phase with CaCu5 crystal structure extends to LaNi4.65 compositional alloys. For fuel cell automobile, the alloys with high content of hydrogen must be developed. Strong candidates for this will be Vanadium based BCC alloys, which would be hard to be activated. Since it is well known that the Laves phases undergo easy activation treatment, it may be possible that the BCC phases will be easily activated if the alloys contain such Laves phases. The present study also found that Zr addition is effective on forming Laves phase as grain boundary phases in BCC phases in V-Ti-Zr-Ni alloys, and on improving the hydrogen absorbing properties. The study will be also extended to future hydrogen absorbing alloys with high capacity.

Original languageEnglish
Pages (from-to)305-312
Number of pages8
JournalMaterials Science and Engineering A
Volume329-331
DOIs
Publication statusPublished - 2002 Jun

Keywords

  • BCC alloys
  • C14 laves phase
  • High capacity of hydrogen
  • Hydrogen storage alloy
  • LaNi melt-spun ribbons
  • Limitation of solid solution of CaCu
  • Multi-phase alloy
  • V-based alloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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