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Surface treatment of LiFePO4 cathode material with PPy/PEG conductive layer

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Abstract

In this work, we studied LiFePO4 particles coated with thin films of highly conductive polypyrrole (PPy) and their electrochemical performance in cathode layers of lithium cells. Carbon-free LiFePO4 particles were synthesized by a solvothermal method. Besides this, a part of the experiments were carried out on commercial carbon-coated LiFePO4 for comparison. Polypyrrole coated LiFePO4 particles (PPy-LiFePO4) were obtained by a straightforward oxidative polymerization of dissolved pyrrole on LiFePO4 particles dispersed in water. The use of polyethylene glycol (PEG) as an additive during the polymerization was decisive to achieve high electronic conductivities in the final cathode layers. The carbon-free and carbon-coated LiFePO4 particles were prepared with PPy and with PPy/PEG coating. The obtained PPy-LiFePO4 and PPy/PEG-LiFePO4 powders were characterized by SEM, EIS, cyclic voltammetry, and galvanostatic charge/discharge measurements in lithium-ion cells with lithium metal as counter and reference electrode. Carbon-free LiFePO4 coated with PPy/PEG hybrid films exhibited very good electrode kinetics and a stable discharge capacity of 156 mAh/g at a rate of C/10. Impedance measurements showed that the PPy/PEG coating decreases the charge-transfer resistance of the corresponding LiFePO4 cathode material very effectively, which was attributed to a favorable mixed ionic and electronic conductivity of the PPy/PEG coatings.

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References

  1. Armand M (1994) Solid State Ionics 69:309

    Article  CAS  Google Scholar 

  2. Ravet N, Chouinard Y, Magnan JF, Besner S, Gauthier M, Armand M (2001) J Power Sources 503:97

    Google Scholar 

  3. Baker J, Saidi MY, Swoyer JL (2003) Electrochem Solid State Lett 6:A53

    Article  Google Scholar 

  4. Franger S, Le Cras F, Bourbon C, Rouault H (2002) Electrochem Solid State Lett 5:A231

    Article  CAS  Google Scholar 

  5. Chen Z, Dahn JR (2002) J Electrochem Soc 149:A1184

    Article  CAS  Google Scholar 

  6. Kuwabata S, Masui S, Yoneyama H (1999) Electrochim Acta 44:4593

    Article  CAS  Google Scholar 

  7. Wang GX, Yang L, Chen Y, Wang JZ, Bewlay S, Liu HK (2005) Electrochim Acta 50:4649

    Article  CAS  Google Scholar 

  8. Tallman DE, Vang C, Wallace GG, Bierwagen GP (2002) J Electrochem Soc 149(3):C173

    Article  CAS  Google Scholar 

  9. Osaka T, Momma T, Nishimura K, Kakuda S, Ishii T (1994) J Electrochem Soc 141:1994

    Article  CAS  Google Scholar 

  10. Kassim A, Ekarmul Mahmud HNM, Yee LM, Hanipah N (2006) Pacific J Sci Technol 7(2):103

    Google Scholar 

  11. Fedorková A, Wiemhöfer HD, Oriňáková R, Oriňák A, Stan MC, Winter M, Kaniansky D, Alejos AN (2009) J Solid State Electrochem 13:1867

    Article  Google Scholar 

  12. Fedorková A, Alejos AN, Gomez-Romero P, Oriňáková R, Kaniansky D (2009) Structural and electrochemical studies of PPy/PEG-LiFePO4 cathode material for Li-ion batteries. Electrochim Acta. doi:10.1016/j.electacta.2009.09.060

    Google Scholar 

  13. Croce F, Epifanio AD, Hassoun J, Deptula A, Olczac T, Scrosati B (2002) Electrochem Solid-State Lett 5:A47

    Article  CAS  Google Scholar 

  14. Takahashi M, Tobishima S, Takei K, Sakuri Y (2002) Solid State Ionics 148:283

    Article  CAS  Google Scholar 

Download references

Acknowledgments

We acknowledge the financial support from DAAD (grant number 03042007/SMS), Slovak Grant Agency VEGA (grant number 1/0043/08) and Project of the Centre of Excelence, under VVCE-0070-07, (financially supported by APVV, Slovakia). We also gratefully acknowledge the support within the BMBF project LiVe, as well as a support by the company Südchemie.

This article is based on our presentation at ABAF-10 Advanced Batteries, Accumulators and Fuel cells, Brno, Czech Republic, August 30, 2008 to September 2, 2009.

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Correspondence to Andrea Fedorková.

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Fedorková, A., Oriňáková, R., Oriňák, A. et al. Surface treatment of LiFePO4 cathode material with PPy/PEG conductive layer. J Solid State Electrochem 14, 2173–2178 (2010). https://doi.org/10.1007/s10008-009-0967-2

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  • DOI: https://doi.org/10.1007/s10008-009-0967-2

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