Benefits of rapid solidification processing of modified LaNi{sub 5} alloys by high pressure gas atomization for battery applications

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A high pressure gas atomization approach to rapid solidification has been employed to investigate simplified processing of Sn modified LaNi{sub 5} powders that can be used for advanced Ni/metal hydride (Ni/MH) batteries. The current industrial practice involves casting large ingots followed by annealing and grinding and utilizes a complex and costly alloy design. This investigation is an attempt to produce powders for battery cathode fabrication that can be used in an as-atomized condition without annealing or grinding. Both Ar and He atomization gas were tried to investigate rapid solidification effects. Sn alloy additions were tested to promote subambient pressure absorption/desorption ... continued below

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6 p.

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Anderson, I.E.; Pecharsky, V.K.; Ting, J.; Witham, C. & Bowman, R.C. December 31, 1997.

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  • Ames Laboratory
    Publisher Info: Ames Lab., IA (United States)
    Place of Publication: Iowa

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Description

A high pressure gas atomization approach to rapid solidification has been employed to investigate simplified processing of Sn modified LaNi{sub 5} powders that can be used for advanced Ni/metal hydride (Ni/MH) batteries. The current industrial practice involves casting large ingots followed by annealing and grinding and utilizes a complex and costly alloy design. This investigation is an attempt to produce powders for battery cathode fabrication that can be used in an as-atomized condition without annealing or grinding. Both Ar and He atomization gas were tried to investigate rapid solidification effects. Sn alloy additions were tested to promote subambient pressure absorption/desorption of hydrogen at ambient temperature. The resulting fine, spherical powders were subject to microstructural analysis, hydrogen gas cycling, and annealing experiments to evaluate suitability for Ni/MH battery applications. The results demonstrate that a brief anneal is required to homogenize the as-solidified microstructure of both Ar and He atomized powders and to achieve a suitable hydrogen absorption behavior. The Sn addition also appears to suppress cracking during hydrogen gas phase cycling in particles smaller than about 25 {micro}m. These results suggest that direct powder processing of a LaNi{sub 5{minus}x}Sn{sub x} alloy has potential application in rechargeable Ni/MH batteries.

Physical Description

6 p.

Notes

OSTI as DE99002538

Source

  • 1997 fall meeting of the Materials Research Society, Boston, MA (United States), 1-5 Dec 1997

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  • Other: DE99002538
  • Report No.: IS-M--882
  • Report No.: CONF-971201--
  • Grant Number: W-7405-ENG-82
  • DOI: 10.2172/348929 | External Link
  • Office of Scientific & Technical Information Report Number: 348929
  • Archival Resource Key: ark:/67531/metadc685371

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  • December 31, 1997

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 6, 2015, 8:52 p.m.

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Anderson, I.E.; Pecharsky, V.K.; Ting, J.; Witham, C. & Bowman, R.C. Benefits of rapid solidification processing of modified LaNi{sub 5} alloys by high pressure gas atomization for battery applications, report, December 31, 1997; Iowa. (digital.library.unt.edu/ark:/67531/metadc685371/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.