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Published on: September 13, 2021
Direct observation of Mn and Ni ordering in LiMn1.5Ni0.5O4 using atomic resolution scanning transmission electron
Ryosuke Okamoto1, Kazuhide Hayashi1, Satoshi Matsumoto2
1Battery Research Laboratories, Sumitomo Metal Mining Co., Ltd, 17-3 Isoura-cho, Niihama, Ehime, Japan.
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.
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