TY - JOUR
T1 - Hybrid architectures from 3D aligned arrays of multiwall carbon nanotubes and nanoparticulate LiCoPO4
T2 - Synthesis, properties and evaluation of their electrochemical performance as cathode materials in lithium ion batteries
AU - Schneider, Jörg J.
AU - Khanderi, Jayaprakash
AU - Popp, Alexander
AU - Engstler, Jörg
AU - Tempel, Hermann
AU - Sarapulova, Angelina
AU - Bramnik, Natalia N.
AU - Mikhailova, Daria
AU - Ehrenberg, Helmut
AU - Schmitt, Ljubomira A.
AU - Dimesso, Lucangelo
AU - Förster, Christoph
AU - Jaegermann, Wolfram
PY - 2011/10
Y1 - 2011/10
N2 - 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.
AB - 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.
KW - Electrochemistry
KW - Hybrid materials
KW - Lithium-ion batteries
KW - Nanoparticles
KW - Nanotubes
KW - Phosphoolevins
UR - http://www.scopus.com/inward/record.url?scp=80053218540&partnerID=8YFLogxK
U2 - 10.1002/ejic.201100217
DO - 10.1002/ejic.201100217
M3 - Article
AN - SCOPUS:80053218540
SN - 1434-1948
SP - 4349
EP - 4359
JO - European Journal of Inorganic Chemistry
JF - European Journal of Inorganic Chemistry
IS - 28
ER -
