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 

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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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