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Impedance of LiFe0.4Mn0.6PO4 Electrodes with Combined Conducting Polymer Binder of PEDOT:PSS and Carboxymethyl Cellulose

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Abstract

This work studies the electrochemical properties of cathodic materials for lithium–ion batteries based on mixed lithium–iron–manganese phosphate LiFe0.4Mn0.6PO4 (LFMP) obtained using a conducting binder containing poly-3,4-ethylenedioxythiophene : polystyrenesulfonate (PEDOT:PSS) and carboxymethyl cellulose (CMC). The results are compared with those for the material based on LiFe0.4Mn0.6PO4 manufactured with the conventional polyvinylidene fluoride (PVDF) binder. The electrode material with the PEDOT:PSS/CMC binder manifests enhanced functional characteristics as compared to electrodes with the conventional binder. It is found that replacement of the conventional binder by the combined conducting PEDOT:PSS/CMC binder in the LFMP-based cathodic material results in an increase in the specific capacity of the cathodic material. Particularly noticeable advantages of the material with respect to specific capacity are observed at high currents (up to 10 C), which can be explained by the increasing rate of the processes of material recharge due to a significant decrease in the charge transfer resistance and an increase in the apparent diffusion coefficient of the lithium ions.

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ACKNOWLEDGMENTS

Studies using the scanning electron microscopy method were carried out with the help of the equipment of the Interdisciplinary Resource Center for Nanotechnology of St. Petersburg State University. We are grateful to the employees of Ioffe Institute, Russian Academy of Sciences, V.V. Zhdanov and A.M. Rumyantsev for their help in conducting the research.

Funding

The work is supported by St. Petersburg State University (project no. 26455158).

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Authors and Affiliations

  1. St. Petersburg State University, University of Chemistry, 199034, St. Petersburg, Russia

    R. V. Apraksin, S. N. Eliseeva, M. A. Kamenskii, E. G. Tolstopyatova & V. V. Kondrat’ev

  2. Eötvös Loránd University, Institute of Chemistry, Pázmány Péter sétány 1/A, 1117, Budapest, Hungary

    G. G. Lang

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  1. R. V. Apraksin
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Correspondence to V. V. Kondrat’ev.

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Translated by M. Ehrenburg

This paper is dedicated to the 80th anniversary of Professor V.V. Malev who has made a considerable contribution into modern directions of electrochemistry.

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Apraksin, R.V., Eliseeva, S.N., Kamenskii, M.A. et al. Impedance of LiFe0.4Mn0.6PO4 Electrodes with Combined Conducting Polymer Binder of PEDOT:PSS and Carboxymethyl Cellulose. Russ J Electrochem 55, 1047–1057 (2019). https://doi.org/10.1134/S1023193519110028

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  • DOI: https://doi.org/10.1134/S1023193519110028

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