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Two-phase reaction mechanism during chemical lithium insertion into α-MoO3

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Abstract

The phase transition during chemical lithium insertion into α-MoO3 was investigated by chemical analysis, X-ray diffraction (XRD) and electrochemical characterisation. The samples have been prepared by reaction of various amounts of water-free lithium iodide with fine-particulate orthorhombic molybdenum trioxide in n-hexane (non-aqueous media), which yielded materials with different Li/Mo ratio. XRD investigations of these materials proved that the crystal structure of the layered α-MoO3 has been changed after the chemical lithiation. The phase transition ranged from 0.25 < x < 0.5 in Li x MoO3 upon chemical lithium insertion into α-MoO3. The XRD lines of lithium inserted phase Li x MoO3 grew at the expense of the XRD lines of the pristine α-MoO3 as lithium ions were chemically inserted until the disappearance of lines related to α-MoO3. The electrochemical performance of the lithiated samples is improved in comparison with the starting material (non-lithiated α-MoO3).

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Acknowledgements

This work was partially supported by the Austrian Science Funds through the special research programme “Electroactive Materials” and by the Egyptian Ministry of High Education and Scientific Research. We thank Merck KgA (Darmstadt, Germany) for the donation of electrolyte samples used in this study.

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Authors and Affiliations

  1. Institute for Chemical Technology of Inorganic Materials, Graz University of Technology, Stremayrgasse16, 8010, Graz, Austria

    A. M. Hashem, M. Winter, J. H. Albering & J. O. Besenhard

  2. National Research Center, Behoes Street, Cairo, Egypt

    A. M. Hashem & M. H. Askar

Authors
  1. A. M. Hashem
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  2. M. H. Askar
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  3. M. Winter
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  4. J. H. Albering
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  5. J. O. Besenhard
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Correspondence to A. M. Hashem.

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Hashem, A.M., Askar, M.H., Winter, M. et al. Two-phase reaction mechanism during chemical lithium insertion into α-MoO3 . Ionics 13, 3–8 (2007). https://doi.org/10.1007/s11581-007-0065-3

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  • DOI: https://doi.org/10.1007/s11581-007-0065-3

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