Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 16, Pages 5360-5369Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2010.03.028
Keywords
Multi-walled carbon nanotubes; Titanium dioxide; Phosphate olivines; Lithium storage
Funding
- Swiss National Science Foundation
- Czech Ministry of Education, Youth and Sports [LC-510, 0009048]
- Academy of Sciences of the Czech Republic [IAA 400400804, KAN200100801, KAN100500652]
- [COST Action D35]
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Multi-walled carbon nanotubes functionalized by carboxylic groups, exhibit better affinity towards TiO2 (P90, Degussa) as compared to that of pristine nanotubes. Also the electrochemical performance of TiO2 is improved by nanotube networking, but the Li-storage capacity of TiO2 is unchanged. Whereas the composite of TiO2 with non-functionalized nanotubes demonstrates simple superposition of the behavior of pure components, the composite with functionalized nanotubes shows unique faradaic pseudocapacitance which is specific for this composite only. The surface functionalization of nanotubes enhances charge storage capacity and reversibility of a composite with LiMnPO4 (olivine), but mediates also the electrolyte breakdown at potentials >4.2 V. Whereas the electrochemical activation of LiMnPO4 (olivine) by functionalized nanotubes is quite modest, excellent performance was found for LiFePO4 (olivine) in composite materials containing only 2 wt% of functionalized nanotubes. (C) 2010 Elsevier B.V. All rights reserved.
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