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2006 Fiscal Year Final Research Report Summary

Synthesis of Metal-Substituted Manganese Dioxides by Soft-Chemistry Method and Application to Active Electrode Materials in secondary cells

Research Project

Project/Area Number 15350117
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Inorganic industrial materials
Research InstitutionIwate University

Principal Investigator

KUMAGAI Naoaki  Iwate University, Graduation School of Engineering, Professor, 工学研究科, 教授 (30003875)

Co-Investigator(Kenkyū-buntansha) NISHIDATE Kazume  Iwate University, Graduation School of Engineering, Associate Professor, 工学研究科, 助教授 (90250638)
KOMABA Shinichi  Iwate University, Graduation School of Engineering, Assistant Professor, 工学研究科, 助手 (20302052)
Project Period (FY) 2003 – 2006
KeywordsSoft-Chemistry synthesis / metal-substituted Manganese Dioxide / Hollandite-type Manganese Oxide / Layered Manganese Oxide / Lithium-ion Battery / Lithium Intercalation
Research Abstract

The present research has aimed to synthesis several metal-substituted manganese dioxides by soft-chemistry routes, such as aqueous solution, hydrothermal, emulsion drying, and spray-drying methods. The chemical compositions and crystal structures of the prepared manganese dioxides were examined, and furthermore the electrochemical characteristics of the prepared manganese oxides were investigated as new cathode materials for secondary lithium batteries. The main results were as follows.
1.New hollandite-type Co-doped α-K_<0.12>(Mn_<1-x>Co_x)O_2 (x=0〜0.12) and orthorhombic LiMn_<1-x>M_x,O_2 (O<x≦0.14 in M=Co,O<x0.1.5 in M=Fe) have been synthesized by aqueous solution and hydrothermal methods, respectively. The crystal structure, surface fine structure, structural variation with lithium intercalation, and lithium diffusion behavior in the crystal lattice were examined.
2.The layered Li excess Li_<1+x>Ni_<0.5>Mn_<0.5>O_2 and its Ti-substituted LiNi_<0.5>Mn_<0.5-x>Ti_xO_2 (x=0〜0.3) have been synthesized by an emulsion-drying method. The structural analysis of the prepared layered materials was carried out by X-ray diffraction, newtron diffraction and X-ray absorption spectroscopic methods. These prepared materials showed a high discharge capacity of 170〜180 mAh/g oxide during 50 cyclings.
3.The layered Li_<1-x>(Ni_<1/3>Co_<1/3>Mn_<1/3>)_xO_2(0≦x≦0.17) has been prepared by a spray-drying method, and the electrochemical characteristics and structural stability have been investigated. The crystal lattice parameter decreased with increasing the amount of Li excess (x-value), and at x=0.17 the highest discharge capacity of 179 mAh/g was obtained during 50 cyclings, due to the enhanced structural stability

  • Research Products

    (12 results)

All 2006 2005

All Journal Article (12 results)

  • [Journal Article] Synthesis of Li [(Ni_<0.5>Mn_<0.5>)_<1-x>Li_x]O_2 by Entulsion Drying Method and Impact of Excess Li on Structural and Electrochemical Properties2006

    • Author(s)
      Seung-Taek Myungほか8
    • Journal Title

      Chemistry of Materials 18

      Pages: 1658-1666

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Hydrothermal phase formation of orthorhombic LiMnO_2 and its derivatives as lithium intercalation compounds2006

    • Author(s)
      Seung-Taek Myungほか3
    • Journal Title

      Solid State Ionics 177

      Pages: 733-739

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Improved electrochemical properties of Li_<1+x>(Ni_<0.3>Co_<0.4>Mn_<0.3>)_<2-δ> (x=0, 0.03 and 0.06) with lithium excess composition prepared by a spray drying method2006

    • Author(s)
      Jung-Min Kimほか2
    • Journal Title

      Electrochimica Acta 52

      Pages: 1483-1490

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Improved Electrochemical Properties and Structural Stability of Overlithiated Li_<1+x>(Ni_<1/3>Co_<1/3>Mn_<1/3>)_<1-x>O_2 Prepared by Spray-Drying Method2006

    • Author(s)
      Jung-Min Kimほか2
    • Journal Title

      Electrochemical and Solid-State Letters 9

      Pages: A494-A498

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Characterization and Lithium Insertion Characteristics of Hollandite-type K_y (Mn_<1-x>M_x)O_2 for Rechargeable Lithium Battery Electrddes2006

    • Author(s)
      N.Kumagaiほか3
    • Journal Title

      Journal of New Materials for Electrochemical Systems 9

      Pages: 175-180

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Synthesis of Li[(Ni_<0.5>Mn_<0.5>)_<1-X>Lix]O_2 by Emulsion Drying Method and Impact of Excess Li on Structural and Electrochemical Properties2006

    • Author(s)
      Seung-Taek Myung, Shinichi Komaba, Koutarou Kurihara, Kiyoharu Hosoya, Naoaki Kumagai, Yang-Kook Sun, Izumi Nakai, Masao Yonemura, Takashi Kamiyama
    • Journal Title

      Chemistry of Materials 18

      Pages: 1658-1666

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Hydrothermal phase formation of orthorhombic LiMnO_2 and its derivatives as lithium intercalation compounds2006

    • Author(s)
      Seung-Taek Myung, Shinichi Komaba, Koutarou Kurihara, Naoaki Kumagai
    • Journal Title

      Solid State Ionics 177

      Pages: 733-739

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Improved electrochemical properties of Li_<1+X>(Ni_<0.3>Co_<0.4>Mn_<0.3>)_<2-δ>(x=0,0.03 and 0.06) with lithium excess composition prepared by a spray drying method2006

    • Author(s)
      Jung-Min Kim, Naoaki Kumagai, Shinichi Komaba
    • Journal Title

      Electrochimica Acta 52

      Pages: 1483-1490

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Improved Electrochemical Properties and Structural Stability of Overlithiated Li_<1+X>(Ni_<1/3>Co_<1/3>Mn_<1/3>)_<1-X>O_2 Prepared by Spray-Drying Method2006

    • Author(s)
      Jung-Min Kim, Naoaki Kumagai, Hoon-Taek Chung, Shinichi Komaba
    • Journal Title

      Electrochemical and Solid-State Letters 9

      Pages: A494-A498

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Characterization and Lithium Insertion Characteristics of Hollandite-type K_y(Mn_<1-X>Mx)O_2 for Rechargeable Lithium Battery Electrodes2006

    • Author(s)
      Naoaki Kumagai, Teruhito Sasaki, Satoru Oshitari, S.Komaba
    • Journal Title

      Journal of New Materials for Electrochemical Systems 9

      Pages: 175-180

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Hydrothermal systhesis of layered Li [Ni_<1/3>Co_<1/3>Mn_<1/3>]O_2 as positive electrode material for lithium secondary battery2005

    • Author(s)
      Seung-Taek Myungほか4
    • Journal Title

      Electrochimica Acta 50

      Pages: 4800-4806

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Hydrothermal systhesis of layered Li[Ni_<1/3>Co_<1/3>Mn_<1/3>]O_2 as positive electrode material for lithium secondary battery2005

    • Author(s)
      Seung-Taek Myung, Myung-Hun Lee, Shinichi Komaba, Naoaki Kumagai, Yang-Kook Sun
    • Journal Title

      Electrochimica Acta 50

      Pages: 4800-4806

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2008-05-27  

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