Structure and Electrochemical Properties of LiFexMn2-xO4 (0 ≤ x ≤ 0.5) Spinel as 5 V Electrode Material for Lithium Batteries

H. Shigemura, H. Sakaebe, H. Kageyama, H. Kobayashi, A. R. West, R. Kanno, S. Morimoto, S. Nasu, M. Tabuchi

研究成果: ジャーナルへの寄稿学術誌査読

117 被引用数 (Scopus)

抄録

An electroactive spinel solid solution, LiFexMn2-xO4 (0 ≤ x ≤ 0.5), was prepared and investigated. X-ray Rietveld refinements showed a small amount of transition metal ions in tetrahedral 8a sites in Fe-substituted samples. The 57Fe Mössbauer spectrum of LiFe0.5Mn1.5O4 at 300 K is composed of two doublets and attributed to trivalent Fe. In the voltage range 3.0 and 5.3 V vs. Li/Li+, two reversible plateaus appeared at 4.9 and 3.9 V during discharge. Combined data of X-ray diffraction, Mn K-edge X-ray absorption near-edge structure (XANES), and 57Fe Mössbauer spectroscopy obtained in situ during charge and discharge demonstrate that the plateau around 4 V on charging is associated with the oxidation of Mn3+ to Mn4+ and the plateau around 5 V with the partial oxidation of Fe3+ to Fe4+.

本文言語英語
ページ(範囲)A730-A736
ジャーナルJournal of the Electrochemical Society
148
7
DOI
出版ステータス出版済み - 7月 2001
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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