Multi-walled carbon nanotubes functionalized by carboxylic groups: Activation of TiO2 (anatase) and phosphate olivines (LiMnPO4; LiFePO4) for electrochemical Li-storage

被引:66
作者
Kavan, Ladislav [1 ]
Bacsa, Revathi [2 ]
Tunckol, Meltem [2 ]
Serp, Philippe [2 ]
Zakeeruddin, Shaik M. [3 ]
Le Formal, Florian [3 ]
Zukalova, Marketa [1 ]
Graetzel, Michael [3 ]
机构
[1] Acad Sci Czech Republic, J Heyrovsky Inst Phys Chem Vvi, CZ-18223 Prague 8, Czech Republic
[2] Univ Toulouse UPS INP LCC 4, Composante ENSIACET, CNRS, Lab Chim Coordinat,UPR 8241, F-31432 Toulouse, France
[3] Ecole Polytech Fed Lausanne, Lab Photon & Interfaces, CH-1015 Lausanne, Switzerland
基金
瑞士国家科学基金会;
关键词
Multi-walled carbon nanotubes; Titanium dioxide; Phosphate olivines; Lithium storage; LITHIUM-ION BATTERIES; SENSITIZED SOLAR-CELLS; SUPERCAPACITOR ELECTRODES; PHOTOCATALYTIC ACTIVITY; COMPOSITE CATHODE; METAL-OXIDES; PERFORMANCE; NANOCOMPOSITE; DEGRADATION; OXIDATION;
D O I
10.1016/j.jpowsour.2010.03.028
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:5360 / 5369
页数:10
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