A versatile method of preparation of carbon-rich LiFePO

Elvira M. Bauer, Carlo Bellitto, Guido Righini, Mauro Pasquali, Alessandro Dell'Era, Pier Paolo Prosini

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Abstract

LiFePO4/C composites were prepared by using organo-phosphonates as a single source of iron, phosphorus and carbon. Fe[RPO3] ·H2O (R = methyl or phenyl group) was heated in the presence of Li2CO3at high temperature and under nitrogen flux. Elemental carbon is formed on the surface of LiFePO4particles leaving a carbon coated material. The materials were characterized by elemental analysis, TG/DTA, XRPD and SEM. Coulometric titration showed that some impurities are present in the final products. The material prepared starting from the iron(II) phenyl phosphonate showed higher discharge capacity, specific energy, and specific power. The specific energy evaluated at C/10 rate was about 520 Wh kg-1. The specific power calculated at 3C rate was in excess at 1400 W kg-1while the specific energy was about 63% of the energy delivered at C/10. No capacity fading was observed upon cycling. The performance of LiFePO4prepared from the iron(II) methyl phosphonate was found to be slightly lower, probably due to the lower carbon content. © 2005 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)544 - 549
Number of pages6
JournalJournal of Power Sources
Volume146
Issue number1-2
DOIs
Publication statusPublished - 26 Aug 2005

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All Science Journal Classification (ASJC) codes

  • Electrochemistry
  • Fuel Technology
  • Materials Chemistry
  • Energy (miscellaneous)

Cite this

Bauer, E. M., Bellitto, C., Righini, G., Pasquali, M., Dell'Era, A., & Prosini, P. P. (2005). A versatile method of preparation of carbon-rich LiFePO. Journal of Power Sources, 146(1-2), 544 - 549. https://doi.org/10.1016/j.jpowsour.2005.03.059