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TRANSMISSION ELECTRON MICROSCOPY STUDIES ON DEGRADATION OF ALLOY ELECTRODE IN NICKEL-METAL HYDRIDE BATTERY

Research Project

Project/Area Number 08455321
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural/Functional materials
Research InstitutionNAGOYA UNIVERSITY

Principal Investigator

KURODA Kotaro  PROFESSOR,NAGOYA UNIVERSITY,DEPT OF MAT.SCI.&ENG., 工学研究科, 教授 (30161798)

Co-Investigator(Kenkyū-buntansha) SAKA Hiroyasu  PROFESSOR,NAGOYA UNIVERSITY,DEPT OF QUANTUM ENG., 工学研究科, 教授 (90023267)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 1997: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1996: ¥4,900,000 (Direct Cost: ¥4,900,000)
Keywordstransmission electron microscopy (TEM) / nickel-metal hydride battery / alloy electrode / hydrogen storage alloy / degradation / cross-sectional TEM / plan-view TEM / analytical electron microscopy (AEM) / focused ion beam (FIB) fabrication / Ni-水素電池
Research Abstract

The hydrogen storage alloys have been applied to secondary batteries. Recently the nickel-metal hydride batteries catch much attention. The hydrogen absorption characterics of LaNi_5 and related compounds have been investigated. It has been suggested, but not proven, that defects such as dislocation, anti-phase boundary and structural disorder are produced by hydrogen reaction.
The influence of hydrogen absorption on the microstructure of Mg-Ni alloys has been investigated by transmission electron microscopy (TEM). Rapidly-quenched Mg-Ni alloys were annealed and then dehydrided. TEM specimens were fabricated by focused ion beam (FIB) technique. Many cracks are evident in the specimen after 5 hydriding-dehydriding cycles.
Deformation structures of LaNi_5 alloy have been observed using TEM in order to clarify the nature of dislocations which affect the degradation of the alloy electrode. LaNI_5 alloy is able to deform at temperatures higher than 850゚C.Many dislocations and subgrains are introduced after deformation. Dislocations in the alloy electrode are thought to be the trapped site of hydrogen, therefore high density of dislocation may affect the degradation of electrode.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] 黒田 光太郎: "集束イオンビームによるピンポイント試料の作製" 第12回分析電子顕微鏡討論会予稿集. 53-58 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 黒田 光太郎: "FIBの原理といくつかの応用例" 日本電子顕微鏡学会第42回シンポジウム論文集. 41-44 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Kuroda: "Application of focused ion beam milling to cross-sectional TEM specimen preparation of industial materials including hetero-interfaces" Thin Solid Films. (in press). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] A.Nohara: "High-temperature deformation of hydrogen-absorbing LaNi_S alloy and identification of dislocations" Proc.the Special Symposium on Advanced Materials. (in press). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Saito: "Microstructural studies of unhydried and dehydried Laves phase in Zr alloy" Proc.the Special Symposium on Advanced Materials. (in press). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Kuroda: "TEM pin-pointed specimen preparation by focused ion beam fabrication" Proc.of 12th Annual Conference on Analytical Electron Microscopy. 53-58 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Kuroda: "Principle of FIB and its application to TEM specimn fabrication" Proc.42nd symposium of Japanese Society of Electron Microscopy. 41-44 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Kuroda, M.Takahashi, T.Kato, H.Saka: "Application of focused ion beam milling to cross-sectional TEM specimen preparation of industial materials including hetero-interfaces" Thin Solid Films. (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] A.Nohara, K.Okada, H.Saka: "High-temperature deformation of hydrogen-absorbing LaNi_5 alloy and identification of dislocations" Proc.the Special Symposium on Advanced Materials. (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Saito, K.Kuroda, H.Saka, K.Itoh, S.Towata: "Microstructural studies of unhydried and dehydried Laves phase in Zn alloy" Proc.the Special Symposium on Advanced Materials. (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Kuroda: "Application pf Focused Ion Beam Milling to Cross-Sectional TEM Specimen Preparation of Industrial Materials Including Heterointerfaces" Thin Solid Films. (in press). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] A.Nohara: "High-Temperature Deformation of Hydrogen-Absorbing LaNi_5 Alloy and Identification of Dislocations" Proc.the Special Symposium on Advanced Materials. (in press). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Saito: "Microstructural Studies of Unhydried and Dehydried Laves Phase in Zr Alloy" Proc.the Special Symposium on Advanced Materials. (in press). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 神田佳貞: "液体急冷したMg-Ni-RE合金の水素吸蔵特性と組織" 日本金属学会講演概要(第120回大会). 289 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 黒田光太郎: "集束イオンビームによるピンポイント試料の作製" 第12回分析電子顕微鏡討論会予稿集. 53-58 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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