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Ionics

, Volume 4, Issue 3–4, pp 220–226 | Cite as

Electrochemical properties of lithium iron oxides prepared by low temperature synthesis

  • L. Bordet-Le Guenne
  • P. Deniard
  • A. Lecerf
  • P. Biensan
  • C. Siret
  • L. Fournès
  • R. Brec
Article

Abstract

Two lithium iron oxides r-Li0.8H0.2FeO2 (ramsdellite-type) and o-Li0.7H0.3FeO2 (orthorhombic structure) have been synthesised by an ion exchange reaction between respectively α-FeOOH and γ-FeOOH, and C2H5OLi at 170 °C and 140 °C. The reaction products were characterised through elemental analyses, infrared spectroscopy, density measurements and X-ray diffraction. The refinement of the powder XRD patterns of r-Li0.8H0.2FeO2 and o-Li0.7H0.3FeO2 has been performed by the Rietveld method and the results show that the products are isostructural to their precursors.

Electrochemical measurements of Li1−xHxFeO2/Li have been made in lithium cells in the 1.5 – 5 V range. Their elemental analyses and the study of X-ray diffraction results and Mössbauer spectroscopy measurements show the instability of Fe4+ in the electrochemically produced species in the electrochemical cell, and therefore the difficulty of cycling on the couple FeIV/FeIII.

Keywords

Lithium FeO2 Iron Oxide Infrared Spectroscopy Electrochemical Property 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© IfI - Institute for Ionics 1998

Authors and Affiliations

  • L. Bordet-Le Guenne
    • 1
  • P. Deniard
    • 1
  • A. Lecerf
    • 2
  • P. Biensan
    • 3
  • C. Siret
    • 3
  • L. Fournès
    • 4
  • R. Brec
    • 1
  1. 1.I.M.N., Laboratoire de Chimie des SolidesNantes cedex 3France
  2. 2.I.N.S.A., Laboratoire de Chimie des SolidesRennes cedexFrance
  3. 3.SAFTMarcoussisFrance
  4. 4.I.C.M.C.B.PESSAC cedexFrance

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