Gas atomization of Cu-modified AB5 metal hydride alloys

K. Young, T. Ouchi, A. Banik, J. Koch, M. A. Fetcenko, L. A. Bendersky, K. Wang, M. Vaudin

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Abstract

Gas atomization together with a hydrogen annealing process has been proposed as a method to achieve improved low-temperature performance of AB 5 alloy electrodes in Ni/MH batteries and restore the original cycle life which was sacrificed by the incorporation of copper in the alloy formula. While the gas atomization process reduces the lattice constant aspect ratio c/a of the Cu-containing alloys, the addition of a hydrogen annealing step recovers this property, although it is still inferior to the conventionally prepared annealed Cu-free alloy. This observation correlates very well with the cycle life performance. In addition to extending the cycle life of the Cu-containing metal hydride electrode, processing by gas atomization with additional hydrogen annealing improves high-rate, low-temperature, and charge retention performances for both Cu-free and Cu-containing AB5 alloys. The degradation mechanisms of alloys made by different processes through cycling are also discussed.

Original languageEnglish (US)
Pages (from-to)4896-4904
Number of pages9
JournalJournal of Alloys and Compounds
Volume509
Issue number14
DOIs
StatePublished - Apr 7 2011

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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