Cathode Materials Based on Lithium Iron Phosphate/PEDOT Composites for Lithium-Ion Batteries

Abstract—

Composites based on LiFePO4/C and poly(3,4-ethylenedioxythiophene) (LiFePO4/C/PEDOT) have been prepared via in situ oxidative EDOT polymerization or mechanical mixing of LiFePO4/C with presynthesized PEDOT particles, including those prepared in the presence of different surfactants (Triton X-100 and cetyltrimethylammonium bromide). The resultant materials have been characterized by X-ray diffraction, scanning electron microscopy, CNHS analysis, and IR spectroscopy. At high current densities, the best electrochemical performance has been demonstrated by the composite prepared by mechanical mixing of LiFePO4/C with a PEDOT suspension in acetonitrile (70 mAh/g at a current density of 1600 mA/g). Further increase in the discharge capacity of the LiFePO4/C/PEDOT composites at high current densities has been ensured by precoating LiFePO4/C particles with the Triton X-100 surfactant (81 mAh/g at 1600 mA/g).

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ACKNOWLEDGMENTS

The SEM and CHNS measurements were performed using shared experimental facilities supported by IGIC RAS state assignment.

Funding

This work was supported by the Russian Academy of Sciences, basic research program no. 1.15.2: Fundamental Principles of Designing Advanced Metallic, Ceramic, and Composite Structural Materials with an Improved Combination of Performance Characteristics, project no. 1.15.2.3.

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Correspondence to I. A. Stenina.

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Ozerova, V.V., Stenina, I.A., Kuz’mina, A.A. et al. Cathode Materials Based on Lithium Iron Phosphate/PEDOT Composites for Lithium-Ion Batteries. Inorg Mater 56, 648–656 (2020). https://doi.org/10.1134/S0020168520050106

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Keywords:

  • LiFePO4
  • poly(3,4-ethylenedioxythiophene)
  • carbon coating
  • cetyltrimethylammonium bromide
  • Triton X-100
  • composite
  • cathode material