Study of local disorder in LiMn(Cr,Ni)O2 compounds by extended X-ray absorption fine structure measurements

L. Maugeri, A. Iadecola, L. Simonelli, G. Chen, H. Wadati, T. Mizokawa, N. L. Saini*

*この研究の対応する著者

研究成果: Article査読

1 被引用数 (Scopus)

抄録

We have studied local structure of LiMnO2, LiMn 0.65Cr0.35O2 and LiMn0.5Ni 0.5O2 compounds by Mn K-edge extended X-ray absorption fine structure measurements. The local structure of LiMnO2 is found to be consistent with Jahn-Teller distorted MnO6 octahedra characterized by two different Mn-O bond distances. The Jahn-Teller distortions are suppressed in the Cr and Ni substituted compounds, resulting a single Mn-O distance. However, the Cr atoms tend to occupy a site at a longer distance from Mn in the host lattice (Mn-Cr distance is longer than Mn-Mn distance), unlike the Ni atoms which prefer a site closer to the Mn atoms (Mn-Ni distance is shorter than Mn-Mn distance). Incidentally, Mn-O and Mn-Mn bonds are substantially stiffer in the Cr and Ni substituted compounds. In addition, the static atomic disorder is confined around Cr atoms in the LiMn 0.65Cr0.35O2, that is different from the case of LiMn0.5Ni0.5O2 in which larger static disorder appears in the proximity of the Mn atoms. The results suggest that the differences in the local structure of different compounds should be the likely reason for their differing battery characteristics.

本文言語English
ページ(範囲)202-207
ページ数6
ジャーナルJournal of Power Sources
242
DOI
出版ステータスPublished - 2013
外部発表はい

ASJC Scopus subject areas

  • 再生可能エネルギー、持続可能性、環境
  • エネルギー工学および電力技術
  • 物理化学および理論化学
  • 電子工学および電気工学

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