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Direct Atomic-Resolution Observation of Two Phases in the Li1.2Mn0.567Ni0.166Co0.067O2 Cathode Material for Lithium-Ion Batteries

Authors

  • Dr. Haijun Yu,

    1. Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Umezono 1-1-1, Tsukuba, 305-8568 (Japan)
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    • These authors contributed equally to this work.

  • Dr. Ryo Ishikawa,

    1. Institute of Engineering Innovation, The University of Tokyo, Tokyo, 113-8654 (Japan)
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    • These authors contributed equally to this work.

  • Dr. Yeong-Gi So,

    1. Institute of Engineering Innovation, The University of Tokyo, Tokyo, 113-8654 (Japan)
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  • Dr. Naoya Shibata,

    1. Institute of Engineering Innovation, The University of Tokyo, Tokyo, 113-8654 (Japan)
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  • Prof. Tetsuichi Kudo,

    1. Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Umezono 1-1-1, Tsukuba, 305-8568 (Japan)
    2. Department of Applied Chemistry, The University of Tokyo, Tokyo, 113-8656 (Japan)
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  • Prof. Haoshen Zhou,

    Corresponding author
    1. Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Umezono 1-1-1, Tsukuba, 305-8568 (Japan)
    2. Department of Chemical System Engineering, The University of Tokyo, Tokyo, 113-8656 (Japan)
    • Haoshen Zhou, Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Umezono 1-1-1, Tsukuba, 305-8568 (Japan)

      Yuichi Ikuhara, Institute of Engineering Innovation, The University of Tokyo, Tokyo, 113-8654 (Japan)

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  • Prof. Yuichi Ikuhara

    Corresponding author
    1. Institute of Engineering Innovation, The University of Tokyo, Tokyo, 113-8654 (Japan)
    • Haoshen Zhou, Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Umezono 1-1-1, Tsukuba, 305-8568 (Japan)

      Yuichi Ikuhara, Institute of Engineering Innovation, The University of Tokyo, Tokyo, 113-8654 (Japan)

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  • This work was partially supported financially by the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program).

Abstract

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About phase: The coexistence of rhombohedral LiTMO2 (TM=Ni, Co, or Mn) and monoclinic Li2MnO3-like structures inside Li1.2Mn0.567Ni0.166Co0.067O2 is revealed directly at atomic resolution. The hetero-interface along the [001]rh/[103]mon zone axis direction is demonstrated, indicating the two-phase nature of these lithium-rich cathode materials (green Li, blue Mn, red O, cyan TM).

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