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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