Electrochemical properties of hydrothermally obtained LiCo1-xFexO2 as a positive electrode material for rechargeable lithium batteries

Hironori Kobayashi, Hikari Shigemura, Mitsuharu Tabuchi, Hikari Sakaebe, Kazuaki Ado, Hiroyuki Kageyama, Atsushi Hirano, Ryoji Kanno, Masayuki Wakita, Shotaro Morimoto, Saburo Nasu

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82 Citations (Scopus)


Changes in the crystal structure and transition metal valency in LiFexCo1-xO2 (0 ≤ x ≤ 0.25) positive electrodes during the charge-discharge of Li/LiFexCo1-xO2 cells were examined using ex situ X-ray diffraction measurements, Fe and Co K-X-ray absorption near edge spectroscopy (XANES) and 57Fe Mossbauer spectroscopy. An iron-doped host material with rhombohedral symmetry was obtained up to 25% Fe per formula unit in LiCoO2 by hydrothermal reaction below 300°C from a mixture of Co3+-Fe3+ co-precipitate (iron-doped CoOOH) and LiOH. No symmetry changes were observed during electrochemical charge-discharge tests up to the tenth cycle. The structures of Li-extracted and reinserted samples were determined by a model similar to LiCoO2 prepared at low temperature in which Li ions are located at the interstitial 6c and octahedral 3a sites. 57Fe Mossbauer and Fe and Co K-XANES spectra at 293 K indicated the presence of tetravalent Fe ions upon oxidation up to 4.3 V.

Original languageEnglish
Pages (from-to)960-969
Number of pages10
JournalJournal of the Electrochemical Society
Issue number3
Publication statusPublished - Mar 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry


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