Hybrid architectures from 3D aligned arrays of multiwall carbon nanotubes and nanoparticulate LiCoPO4: Synthesis, properties and evaluation of their electrochemical performance as cathode materials in lithium ion batteries

Jörg J. Schneider*, Jayaprakash Khanderi, Alexander Popp, Jörg Engstler, Hermann Tempel, Angelina Sarapulova, Natalia N. Bramnik, Daria Mikhailova, Helmut Ehrenberg, Ljubomira A. Schmitt, Lucangelo Dimesso, Christoph Förster, Wolfram Jaegermann

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Hybrid materials composed of LiMPO4 (M = Fe or Co) with multiwalled carbon nanotubes (MCNTs) were synthesized by tethering lithium phosphoolevins on isolated stochastically disordered MWCNTs as well as on ordered 3D MWCNT arrays via solution based impregnation routes. Ordered 3D arrays of MWCNT monoliths comprising MWCNTs with nominal tube diameters of 60 and 200 nm were synthesized by a catalyst free, template based method, with porous aluminum oxide (PAOX) acting as a template. Consecutive selectiveetching processes gave free standing aligned 3D carbon nanotube (CNT) architectures that were used as supporting cathode structures for electroactive LiCoPO 4. LiCoPO4 nanoparticle suspensions derived from an ethanol based organic phosphate source turned out to be superior for the tethering of LiCoPO4 nanoparticles onto the 3D aligned CNT arrays compared to an aqueous based tethering route, thus giving hybrid materials with better electrochemical battery performance compared to materials generated by the latter method. Li ion extraction within the ordered 3D CNT/LiCoPO 4 composites seems to be a two-step process and the Li intercalation a one-step process, highlighting the enhanced kinetics of the Li insertion process in the 3D CNT/LixCoPO4 composite in comparison to a particulate mixture of LixCoPO4 that is typically present in a conventional carbon/LiCoPO4 cathode composite system.

Original languageEnglish (US)
Pages (from-to)4349-4359
Number of pages11
JournalEuropean Journal of Inorganic Chemistry
Issue number28
DOIs
StatePublished - Jan 1 2011

Keywords

  • Electrochemistry
  • Hybrid materials
  • Lithium-ion batteries
  • Nanoparticles
  • Nanotubes
  • Phosphoolevins

ASJC Scopus subject areas

  • Inorganic Chemistry

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