TY - JOUR
T1 - Facile kinetics of Li-ion intake causes superior rate capability in multiwalled carbon nanotube@TiO2 nanocomposite battery anodes
AU - Acevedo-Peña, Próspero
AU - Haro, Marta
AU - Rincón, Marina E.
AU - Bisquert, Juan
AU - Garcia-Belmonte, Germà
N1 - Funding Information:
This work has been given the financial support from CONACyT (Project CB-2010/153270 ) and UNAM (PAPIIT-UNAM project IN106912 ). P. Acevedo-Peña is grateful to UNAM for the Postdoctoral grant and the program CYTED-Nanoenergías. The authors thank to Ph.D. J.C. Calva from IER-UNAM for its help in MWCNT synthesis and to Ph.D. M.G. Almazan from CIDETEQ for its help in Raman spectroscopy characterization. We acknowledge financial support from GeneralitatValenciana (project ISIC/2012/008 Institute of Nanotechnologies for Clean Energies).
PY - 2014/12/15
Y1 - 2014/12/15
N2 - Nanotechnology produces hybrids with superior properties than its individual constituents. Here MWCNT@TiO2 composites have been synthesized by controlled hydrolysis of titanium isopropoxide over MWCNT, to be incorporated into Li-ion battery electrodes. Outstanding rate capability of the coated nanotubes is observed in comparison to pristine TiO2. Specific storage capacity as high as 250 mAh g-1 is achieved for the nanocomposite electrode which doubles that encountered for TiO2-based anodes. The mechanism explaining the enhancement in power performance has been revealed by means of electrochemical impedance methods. Although both pristine TiO2 and MWCNT@TiO2 would potentially exhibit comparable specific capacity, the charge transfer resistance for the latter is reduced by a factor 10, implying a key role of MWCNTs to favor the interfacial Li + ion intake from the electrolyte. MWCNT efficiently provides electrons to the nanostructure through the Ti-C bond which assists the Li + ion incorporation. These findings provide access to the detailed lithiation kinetics of a broad class of nanocomposites for battery applications.
AB - Nanotechnology produces hybrids with superior properties than its individual constituents. Here MWCNT@TiO2 composites have been synthesized by controlled hydrolysis of titanium isopropoxide over MWCNT, to be incorporated into Li-ion battery electrodes. Outstanding rate capability of the coated nanotubes is observed in comparison to pristine TiO2. Specific storage capacity as high as 250 mAh g-1 is achieved for the nanocomposite electrode which doubles that encountered for TiO2-based anodes. The mechanism explaining the enhancement in power performance has been revealed by means of electrochemical impedance methods. Although both pristine TiO2 and MWCNT@TiO2 would potentially exhibit comparable specific capacity, the charge transfer resistance for the latter is reduced by a factor 10, implying a key role of MWCNTs to favor the interfacial Li + ion intake from the electrolyte. MWCNT efficiently provides electrons to the nanostructure through the Ti-C bond which assists the Li + ion incorporation. These findings provide access to the detailed lithiation kinetics of a broad class of nanocomposites for battery applications.
KW - Carbon nanotubes
KW - Core-shell materials
KW - Electrochemical impedance spectroscopy
KW - Electrode kinetics
KW - Li-ion batteries
UR - http://www.scopus.com/inward/record.url?scp=84903600895&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2014.06.058
DO - 10.1016/j.jpowsour.2014.06.058
M3 - Artículo
SN - 0378-7753
VL - 268
SP - 397
EP - 403
JO - Journal of Power Sources
JF - Journal of Power Sources
ER -