A TEM study of morphological and structural degradation phenomena in LiFePO4-CB cathodes: Morphological and structural degradation in LiFePO4-CB cathodes

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Abstract

LiFePO4-based cathodes suffer from various degradation mechanisms, which influences the battery performance. In this paper, morphological and structural degradation phenomena in laboratory cathodes made of LiFePO4 mixed with carbon black (CB) in a 1 mol/L LiPF6 in EC : DMC (1:1 by weight) electrolyte are investigated by transmission electron microscopy at various preparation, assembling, storage, and cycling stages. High-resolution transmission electron microscopy imaging shows that continuous SEI layers are formed on the LiFePO4 particles and that both storage and cycling affect the formation. Additionally, loss of CB crystallinity, CB aggregation, and agglomeration is observed. Charge–discharge curves and impedance spectra measured during cycling confirm that these degradation mechanisms reduce the cathode conductivity and capacity.
Original languageEnglish
JournalInternational Journal of Energy Research
Volume40
Issue number14
Pages (from-to)2022-2032
Number of pages11
ISSN0363-907X
DOIs
Publication statusPublished - 2016

Keywords

  • Lithium ion battery
  • Cathode degradation
  • Nanoparticles
  • Transmission electron microscopy
  • High-resolution transmission electron microscopy

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