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Journal of Thermal Analysis and Calorimetry

, Volume 132, Issue 2, pp 1055–1064 | Cite as

Investigation of hydrolysis of lithium oxide by thermogravimetry, calorimetry and in situ FTIR spectroscopy

  • Guy Weber
  • Elisabeth Sciora
  • Jordan Guichard
  • Frédéric Bouyer
  • Igor Bezverkhyy
  • J. Marcos Salazar
  • Céline Dirand
  • Frédéric Bernard
  • Hervé Lecoq
  • Rémy Besnard
  • Jean-Pierre Bellat
Article
  • 158 Downloads

Abstract

The mechanism of hydrolysis of lithium oxide (Li2O) was studied by thermogravimetry, calorimetry and in situ infrared spectroscopy under water (H2O) vapor pressure at 298 K. Additional infrared measurements were also performed with heavy water (D2O) to go deeper in the understanding of the mechanism. First, this study showed that the pristine oxide is composed of micrometric particles of lithium oxide core surrounded by a thin protective layer of lithium hydroxide (LiOH). When exposed to a pressure below 5 hPa, the hydrolysis of the particles proceeds mainly through the adsorption of water molecules on the external surface of the lithium hydroxide layer and to a lesser extent to the formation of lithium hydroxide for the smallest particles. By increasing the pressure, the reaction proceeds through the alternative formation of lithium hydroxide monohydrate (LiOH·H2O) and lithium hydroxide. The kinetics of this reaction is controlled by water diffusion through the lithium hydroxide layer. In such a process, the formation of the monohydrate starts when the LiOH layer reaches some critical thickness.

Keywords

Hydrolysis Calorimetry Thermogravimetry FTIR Li2LiOH LiOH·H2

Notes

Acknowledgements

The authors would like to thank all members of ICB (UMR 6303 CNRS-Université de Bourgogne Franche-Comté) for their contribution to this paper: Lucien Saviot for the Raman analysis, Frederic Herbst for the SEM analysis, Nicolas Geoffroy for the XRD analysis.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  • Guy Weber
    • 1
  • Elisabeth Sciora
    • 1
  • Jordan Guichard
    • 1
    • 2
  • Frédéric Bouyer
    • 1
  • Igor Bezverkhyy
    • 1
  • J. Marcos Salazar
    • 1
  • Céline Dirand
    • 1
  • Frédéric Bernard
    • 1
  • Hervé Lecoq
    • 2
  • Rémy Besnard
    • 2
  • Jean-Pierre Bellat
    • 1
  1. 1.Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303, CNRSUniversité de Bourgogne Franche-ComtéDijon CedexFrance
  2. 2.CEA, DAM, ValducIs sur TilleFrance

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