Direct observation of Mn and Ni ordering in LiMn1.5Ni0.5O4 using atomic resolution scanning transmission electron microscopy

Ryosuke Okamoto, Kazuhide Hayashi, Satoshi Matsumoto, Naomi Suzuki, Masami Terauchi, Kenji Tsuda

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    LiMn1.5Ni0.5O4 is an excellent candidate as a cathode-active material in high-voltage lithium-ion batteries and studied using atomic resolution scanning transmission electron microscope. High-angle annular dark-field (HAADF) images obtained at [100] orientation demonstrate that Mn and Ni atoms are regularly ordered at octahedral sites in a spinel structure, in a 3:1 ratio between columns with high and low intensities. Simulations of HAADF images revealed that atomic columns including Mn exhibit a larger intensity than that by Ni columns, primarily because of the effect of the Debye- Waller factor.

    Original languageEnglish
    Pages (from-to)280-285
    Number of pages6
    JournalMicroscopy
    Volume67
    Issue number5
    DOIs
    Publication statusPublished - 2018 Oct 1

    Keywords

    • Debye-Waller factor
    • High-angle annular dark-field image
    • LiMnNiO
    • Lithium-ion battery
    • Mn and Ni ordering
    • Scanning transmission electron microscopy

    ASJC Scopus subject areas

    • Structural Biology
    • Instrumentation
    • Radiology Nuclear Medicine and imaging

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