新規LiScO<sub>2</sub>系リチウムイオン導電体の合成,結晶構造解析,イオン導電特性  [in Japanese] Synthesis, Crystal Structure and the Ionic Conductivity of New Lithium Ion Conductors, <i>M</i>-doped LiScO<sub>2</sub> (<i>M</i> = Zr, Nb, Ta)  [in Japanese]

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Author(s)

    • 趙 国偉 ZHAO Guowei
    • 東京工業大学総合理工学研究科物質電子化学専攻 Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
    • MUHAMMAD Iqbal MUHAMMAD Iqbal
    • 東京工業大学総合理工学研究科物質電子化学専攻 Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
    • 鈴木 耕太 [他] SUZUKI Kota
    • 東京工業大学総合理工学研究科物質電子化学専攻 Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
    • 平山 雅章 HIRAYAMA Masaaki
    • 東京工業大学総合理工学研究科物質電子化学専攻 Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
    • 菅野 了次 KANNO Ryoji
    • 東京工業大学総合理工学研究科物質電子化学専攻 Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology

Abstract

New lithium ion conductors of <i>M</i>-doped LiScO<sub>2</sub> (<i>M</i> = Zr, Nb, and Ta) were synthesized by a solid-state reaction method. Peak shifts of the X-ray diffraction patterns revealed the formation of solid solutions with aliovalent cation doping. In addition, increase in the ionic conductivity by the <i>M</i> doping is indicated. The highest total conductivity of 7.94 × 10<sup>−6</sup> S cm<sup>−1</sup> at 623 K with an activation energy of 88 ± 5 kJ mol<sup>−1</sup> was observed for the Zr<sup>4+</sup> doped sample in the systems. The Zr<sup>4+</sup> doped system showed the largest solid solution limit in Li<sub>1−</sub><i><sub>x</sub></i>Sc<sub>1−</sub><i><sub>x</sub></i>Zr<i><sub>x</sub></i>O<sub>2</sub> (<i>x</i> ≈ 0.1) and continuous increase of the conductivity with increasing <i>x</i>. Structural analysis by Rietveld refinement indicated that the lattice expansion and lithium-ion vacancy formation by the Zr doping in the structure, which could contribute to the increase in the ionic conductivity.

Journal

  • Journal of the Japan Society of Powder and Powder Metallurgy

    Journal of the Japan Society of Powder and Powder Metallurgy 62(11), 543-547, 2015

    Japan Society of Powder and Powder Metallurgy

Codes

  • NII Article ID (NAID)
    130005111964
  • NII NACSIS-CAT ID (NCID)
    AN00222724
  • Text Lang
    JPN
  • ISSN
    0532-8799
  • NDL Article ID
    026948111
  • NDL Call No.
    Z17-274
  • Data Source
    NDL  J-STAGE 
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