Journal
JOURNAL OF POWER SOURCES
Volume 268, Issue -, Pages 397-403Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.06.058
Keywords
Li-ion batteries; Core-shell materials; Carbon nanotubes; TiO2; Electrode kinetics; Electrochemical impedance spectroscopy
Funding
- CONACyT [CB-2010/153270]
- UNAM (PAPIIT-UNAM) [IN106912]
- UNAM
- GeneralitatValenciana [ISIC/2012/008]
Ask authors/readers for more resources
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. (C) 2014 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available