Journal of Sol-Gel Science and Technology

, Volume 62, Issue 1, pp 98–110

Disordered carbon nanofibers/LiCoPO4 composites as cathode materials for lithium ion batteries

  • Angelina Sarapulova
  • Daria Mikhailova
  • Ljubomira Ana Schmitt
  • Steffen Oswald
  • Natalia Bramnik
  • Helmut Ehrenberg
Original Paper

DOI: 10.1007/s10971-012-2691-0

Cite this article as:
Sarapulova, A., Mikhailova, D., Schmitt, L.A. et al. J Sol-Gel Sci Technol (2012) 62: 98. doi:10.1007/s10971-012-2691-0

Abstract

LiCoPO4-coated disordered carbon nanofibers (CNFs/LiCoPO4) were obtained by a sol–gel method, using triethyl phosphite or triethyl phosphate as the phosphorous source. The crystal structure of the products was analyzed by X-ray powder diffraction, while morphology was studied using scanning electron microscopy, transmission electron microscopy, Auger electron spectroscopy and X-ray photoelectron spectroscopy. Optimal synthesis conditions for the CNFs/LiCoPO4 in light of the best electrochemical performance are discussed. The best discharge capacity 105 mAh/g (or ca. 63% of the theoretical capacity) shows the material with 40% CNFs/LiCoPO4 and addition coating by carbon black. This composition has a best purity of active materials and point coverage of CNFs. The X-ray photoelectron C1s spectra of the CNFs surface without and with sputter erosion show enhancement of C–O bonds at the fiber surface, which does not influence significantly electrochemical behavior of the composite materials.

Keywords

Phosphoolivines Disordered CNFs/LiCoPO4 composite Triethyl phosphite- and triethyl phosphate-based sol–gel method Li extraction/insertion mechanism 

Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Angelina Sarapulova
    • 1
  • Daria Mikhailova
    • 1
    • 2
  • Ljubomira Ana Schmitt
    • 2
  • Steffen Oswald
    • 1
  • Natalia Bramnik
    • 2
  • Helmut Ehrenberg
    • 1
    • 2
    • 3
  1. 1.Institute for Complex Materials, IFW DresdenDresdenGermany
  2. 2.Institute for Materials Science, Darmstadt University of TechnologyDarmstadtGermany
  3. 3.Karlsruhe Institute of Technology (KIT), Institute for Applied Materials (IAM)Eggenstein-LeopoldshafenGermany

Personalised recommendations