Lithium extraction and insertion behavior of nanocrystalline Li2TiO3-LiFeO2 solid solution with cubic rock salt structure

Hikari Shigemura, Mitsuharu Tabuchi, Hikari Sakaebe, Hironori Kobayashi, Hiroyuki Kageyama

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40 Citations (Scopus)

Abstract

Nanocrystalline Li2TiO3-LiFeO2 solid solution with rock salt structure (space group Fm3m) has been synthesized by a hydrothermal method. It showed lithium extraction at 4 V vs. Li/Li+ and insertion at three potential regions of 4, 3, and below 2.5 V with total capacity of about 200 mAh g-1. The spectral changes in in situ 57Fe Mössbauer spectra during the charge and discharge process demonstrated that the redox reactions of Fe3+/Fe4+ and Fe2+/Fe3+ in partial Fe ions are concerned with the capacities at 4 and below 2.5 V, respectively. In situ Ti-K X-ray absorption fine structure (XAFS) study suggested that Ti ions remained tetravalent in valence through the cycle and that, however, two environments around Ti appeared. The charge redistribution would occur during the charge and discharge process.

Original languageEnglish
Pages (from-to)A638-A644
JournalJournal of the Electrochemical Society
Volume150
Issue number5
DOIs
Publication statusPublished - May 2003
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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