Abstract
A novel TiO2three-dimensional (3D) anode with an aligned TiO2nanotube/nanoparticle heterostructure (TiO2NTs/NPs) is developed by simply immersing as-anodized TiO2NTs into water and further crystallizing the TiO2NTs by post-annealing. The heterostructure, with its core in a tubular morphology and with both the outer and inner surface consisting of nanoparticles, is confirmed by FESEM and TEM. A reversible areal capacity of 0.126 mAh·cm-2is retained after 50 cycles for the TiO2NTs/NPs heterostructure electrode, which is higher than that of the TiO2NTs electrode (0.102 mAh·cm-2after 50 cycles). At the current densities of 0.02, 0.04, 0.06, 0.08, 0.10 and 0.20 mA·cm-2, the areal capacities are 0.142, 0.127, 0.117, 0.110, 0.104 and 0.089 mAh·cm-2, respectively, for the TiO2NTs/NPs heterostructure electrode compared to the areal capacities of 0.123, 0.112, 0.105, 0.101, 0.094 and 0.083 mAh·cm-2, respectively, for the the TiO2NTs electrode. The enhanced electrochemical performance is attributed to the unique microstructure of the TiO2NTs/NPs heterostructure electrode with the TiO2NT core used as a straight pathway for electronic transport and with TiO2NP offering enhanced surface areas for facile Li+ insertion/extraction. The results described here inspire a facile approach to fabricate a 3D anode with an enhanced electrochemical performance for lithium-ion microbattery applications.
Original language | English |
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Article number | 455401 |
Journal | Nanotechnology |
Volume | 25 |
Issue number | 45 |
DOIs | |
Publication status | Published - 14 Nov 2014 |
Keywords
- anodization
- lithium-ion microbatteries
- three-dimensional anode
- titania nanotube/nanoparticle heterostructure
- water treament
ASJC Scopus subject areas
- Bioengineering
- Chemistry(all)
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
- Electrical and Electronic Engineering