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

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

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 mono...

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Bibliographic Details
Published in:European Journal of Inorganic Chemistry 2011, Vol.2011 (28), p.4349-4359
Main Authors: Schneider, Jörg J., Khanderi, Jayaprakash, Popp, Alexander, Engstler, Jörg, Tempel, Hermann, Sarapulova, Angelina, Bramnik, Natalia N., Mikhailova, Daria, Ehrenberg, Helmut, Schmitt, Ljubomira A., Dimesso, Lucangelo, Förster, Christoph, Jaegermann, Wolfram
Format: Review
Language:eng
Subjects:
Electrochemistry
Hybrid materials
Lithium-ion batteries
Nanoparticles
Nanotubes
Phosphoolevins
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Summary: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 LiCoPO4. 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/LiCoPO4 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. The synthesis and electrochemical performance of stochastically arranged and 3D ordered CNT/LiCoPO4 cathode composites is reported. Li ion extraction within such composites seems to be a two‐step process and Li intercalation a one‐step process, which highlights the enhanced kinetics of the Li insertion process in such composites compared to conventional carbon black/LixCoPO4 composites.
ISSN:1434-1948
1099-0682