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Title: | Aligned TiO2 nanotube/nanoparticle heterostructures with enhanced electrochemical performance as three-dimensional anode for lithium-ion microbatteries | Authors: | Xie, K Guo, M Lu, W Huang, H |
Issue Date: | 22-Oct-2014 | Source: | Nanotechnology, 22 Oct. 2014, v. 25, no. 45, 455401 | Abstract: | A novel TiO2 three-dimensional (3D) anode with an aligned TiO2 nanotube/nanoparticle heterostructure (TiO2 NTs/NPs) is developed by simply immersing as-anodized TiO2 NTs into water and further crystallizing the TiO2 NTs 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-2 is retained after 50 cycles for the TiO2 NTs/NPs heterostructure electrode, which is higher than that of the TiO2 NTs electrode (0.102 mAh·cm-2 after 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 TiO2 NTs/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 TiO2 NTs electrode. The enhanced electrochemical performance is attributed to the unique microstructure of the TiO2 NTs/NPs heterostructure electrode with the TiO2 NT core used as a straight pathway for electronic transport and with TiO2 NP 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. | Keywords: | Anodization Lithium-ion microbatteries Three-dimensional anode Titania nanotube/nanoparticle heterostructure Water treament |
Publisher: | Institute of Physics Publishing | Journal: | Nanotechnology | ISSN: | 0957-4484 | EISSN: | 1361-6528 | DOI: | 10.1088/0957-4484/25/45/455401 | Rights: | © 2014 IOP Publishing Ltd This manuscript version is made available under the CC-BY-NC-ND 4.0 license (https://creativecommons.org/licenses/by-nc-nd/4.0/) The following publication Xie, K., Guo, M., Lu, W., & Huang, H. (2014). Aligned TiO2 nanotube/nanoparticle heterostructures with enhanced electrochemical performance as three-dimensional anode for lithium-ion microbatteries. Nanotechnology, 25(45), 455401 is available at https://doi.org/10.1088/0957-4484/25/45/455401. |
Appears in Collections: | Journal/Magazine Article |
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Aligned_TiO2_Nanotube.pdf | Pre-Published version | 1.69 MB | Adobe PDF | View/Open |
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