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Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid)–polymer composites as functional cathode binders for high power LiFePO4 batteries

Authors
  • Kubarkov, Aleksei V.1
  • Drozhzhin, Oleg A.1, 2
  • Karpushkin, Evgeny A.1
  • Stevenson, Keith J.1, 2
  • Antipov, Evgeny V.1
  • Sergeyev, Vladimir G.1
  • 1 Lomonosov Moscow State University, Department of Chemistry, Leninskiye Gory 1-3, Moscow, 119991, Russia , Moscow (Russia)
  • 2 Skolkovo Institute of Science and Technology, Nobel Street 3, Moscow, 143026, Russia , Moscow (Russia)
Type
Published Article
Journal
Colloid & Polymer Science
Publisher
Springer-Verlag
Publication Date
Jan 11, 2019
Volume
297
Issue
3
Pages
475–484
Identifiers
DOI: 10.1007/s00396-018-04468-0
Source
Springer Nature
Keywords
License
Yellow

Abstract

Electroactive conductive composites based on poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) (PEDOT:PSS) and co-binding polymers—poly(ethylene oxide) (PEO) or sulfonated poly(phenylene oxide) (SPPO)—have been evaluated as conductive binders for LiFePO4 cathodes in Li-ion batteries. We have demonstrated that PEDOT:PSS–PEO and PEDOT:PSS–SPPO facilitated charge transfer for high rate application (discharge capacity up to 115 mAh g−1 at 3C). The thicker cathodes containing extra high loading of commercial LiFePO4/C (95 wt%, 19 mg cm−2) have exhibited specific capacity of up to 120 mAh g−1 and areal capacity of up to 2 mAh cm−2 at 1C, several times higher as compared to the earlier reported LiFePO4/PEDOT cathodes. While the application of PEO in PEDOT:PSS composites is restricted to sulfolane-based electrolytes due to solubility limitations, the PEDOT:PSS–SPPO-based cathodes can be used with conventional carbonate electrolytes, showing good stability and cyclability.

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