Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid)–polymer composites as functional cathode binders for high power LiFePO4 batteries
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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.
KeywordsBattery materials Charge transport Composites Polymer blends Cathode binder Conducting polymers Areal capacity
The authors are grateful to Andrey Chekannikov and Nataliya Gvozdik for Raman microscopic imaging. Research reported in this publication was done in collaboration with Center for Electrochemical Energy Storage of Skolkovo Institute of Science and Technology and Lomonosov Moscow State University Program of Development.
The authors acknowledge financial support from the Russian Science Foundation (project N 17-73-30006).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no competing interest.
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