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Microstructural Evolution Of Iron Oxyfluoride/Carbon Nanocomposites Upon Electrochemical Cycling

Sina, M ; Pereira, N ; Amatucci, G. G ; Cosandey, F

Journal of physical chemistry. C, 2016-06, Vol.120 (25), p.13375-13383 [Periódico revisado por pares]

United States: American Chemical Society

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  • Título:
    Microstructural Evolution Of Iron Oxyfluoride/Carbon Nanocomposites Upon Electrochemical Cycling
  • Autor: Sina, M ; Pereira, N ; Amatucci, G. G ; Cosandey, F
  • Assuntos: charge transport ; defects ; ENERGY STORAGE ; energy storage (including batteries and capacitors) ; materials and chemistry by design ; synthesis (novel materials)
  • É parte de: Journal of physical chemistry. C, 2016-06, Vol.120 (25), p.13375-13383
  • Notas: SC0001294
    USDOE Office of Science (SC), Basic Energy Sciences (BES)
  • Descrição: High electrochemical performance iron oxyfluoride conversion electrode undergoes complex electrochemical reaction mechanisms upon cycling. In this work, a combination of selected area electron diffraction (SAED) and scanning transmission electron microscopy/electron energy loss spectroscopy (STEM/EELS) analysis techniques have been used to understand the conversion-reconversion mechanisms of FeO0.7F1.3/C upon cycling. Considerable changes have been observed with cycling. For the fully delithiated electrodes, the nanometer scale intermixing of amorphous rutile and nanocrystalline rocksalt phases is stable up to 20 cycles; however, upon further cycling the amount of amorphous rutile phase decreased and amount of rocksalt phase increased gradually, implying incomplete reconversion reactions with increasing cycle number. In addition, a progressive growth of solid electrolyte interphase (SEI) layer was observed with cycling, which is mainly composed of LiF. Interestingly, Fe2+ and Fe nanoparticles were found trapped in the SEI layer with increasing cycle number. Upon cycling, the combined progressive increase in Fe2+ content and insulating LiF (from SEI and conversion product) give rise to the observed capacity loss.
  • Editor: United States: American Chemical Society
  • Idioma: Inglês
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