A Bicontinuous Nanostructure Induced in Lithiated Iron Fluoride Electrodes of Lithium-ion Batteries Investigated by Small-Angle X-ray Scattering

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  • HORI Hironobu
    Institute for Materials Chemistry and Engineering, Kyushu University
  • ISHIKAWA Chikako
    Transdisciplinary Research and Education Center for Green Technologies, Kyushu University
  • INOISHI Atsushi
    Institute for Materials Chemistry and Engineering, Kyushu University
  • SAKAEBE Hikari
    Institute for Materials Chemistry and Engineering, Kyushu University Research Institute of Electrochemical Energy, Department of Energy and Environment, National Institute of Advanced Industrial Science and Technology (AIST)
  • OKADA Shigeto
    Institute for Materials Chemistry and Engineering, Kyushu University

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Description

<p>In a conversion-type electrode material of lithium-ion batteries, a phase separation phenomenon is induced by charge-discharge reaction. In this study, the spatial periodicity of phase-separated nanostructures induced in the discharged ferrous fluoride (FeF2) electrodes were investigated using the small-angle X-ray scattering (SAXS) method. The SAXS results of discharged FeF2 resembled the scattering results of the bicontinuous structures via spinodal decomposition. Thus, the SAXS results showed that the discharged FeF2 electrodes were modulated nanostructures with a spatial periodicity. SAXS measurements also showed that the size of the discharged FeF2 nanostructures was dependent on the cycle number. These SAXS finding on the morphological evolution of the nanoscale structure of conversion electrodes should be useful to reveal the mechanism of conversion reactions.</p>

Journal

  • Electrochemistry

    Electrochemistry 90 (7), 077007-077007, 2022-07-30

    The Electrochemical Society of Japan

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