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Improved lithium exchange at LiFePO4 cathode particles by coating with composite polypyrrole–polyethylene glycol layers

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Abstract

The polypyrrole–LiFePO4 composites were synthesized by simple chemical oxidative polymerization of pyrrole (Py) monomer directly on the surface of LiFePO4 particles. Properties of resulting polypyrrole–LiFePO4 (PPy-LiFePO4) samples (especially conductivity) are strongly affected by the preparation technique, polymer additives, and conditions during synthesis. For increasing of PPy-LiFePO4 conductivity, we used polyethylene glycol (PEG) as additive during polymerization. The electrochemical behavior of the samples was examined by cyclic voltammetry and electrochemical impedance spectroscopy. It was found that PPy/PEG composite polymer decreased the particle to particle contact resistance. Impedance measurements showed that the coating of PPy/PEG significantly decreases the charge transfer resistance of LiFePO4 electrodes.

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Acknowledgements

We acknowledge the financial support from DAAD (grant no. 03042007/SMS) and the Slovak Grant Agency VEGA (grant no. 1/0043/08). This article is based on our presentation at ABA-9 Advanced Batteries and Accumulators, Brno, Czech Republic, 29 June–3 July 2008. We also like to acknowledge the support by the company Südchemie.

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Authors and Affiliations

  1. Department of Analytical Chemistry, Faculty of Science, Comenius University, Mlynská Dolina, SK-842 15, Bratislava 4, Slovak Republic

    Andrea Fedorková & Dušan Kaniansky

  2. Department of Inorganic and Analytical Chemistry, Westfälische Wilhelms University, Corrensstrase 30, 481 49, Münster, Germany

    Hans-Dieter Wiemhöfer

  3. Institute of Chemistry, Faculty of Science, P.J. Šafárik University, Moyzesova 11, SK-04154, Košice, Slovak Republic

    Renáta Oriňáková & Andrej Oriňák

  4. Department of Physical Chemistry, Westfälische Wilhelms University, Corrensstrase 30, 481 49, Münster, Germany

    Marian Cristian Stan & Martin Winter

  5. Institut de Ciencia de Materials de Barcelona (CSIC), Campus UAB, E-08193, Bellaterra, Barcelona, Spain

    Ana Nacher Alejos

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  1. Andrea Fedorková
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  2. Hans-Dieter Wiemhöfer
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  3. Renáta Oriňáková
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  4. Andrej Oriňák
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Correspondence to Andrea Fedorková.

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Fedorková, A., Wiemhöfer, HD., Oriňáková, R. et al. Improved lithium exchange at LiFePO4 cathode particles by coating with composite polypyrrole–polyethylene glycol layers. J Solid State Electrochem 13, 1867–1872 (2009). https://doi.org/10.1007/s10008-008-0756-3

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  • DOI: https://doi.org/10.1007/s10008-008-0756-3

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