Abstract
Porous nanocrystalline anatase TiO2 was prepared by a modified hydrolytic route coupled with an intermediary amorphization/recrystallization process. The phase structure and morphology of the products were analyzed by X-ray diffraction, transmission electron microscopy, and field-emission scanning electron microscopy. The electrochemical properties were investigated by cyclic voltammetry, constant current discharge–charge tests, and electrochemical impedance techniques. Applied as an anode in a lithium-ion battery, the material exhibited excellent specific capacities of 130 mAh g−1 (at the rate of 2000 mA g−1) and 96 mAh g−1 (at the rate of 4000 mA g−1) after 100 cycles; the coulombic efficiency was ~99.5 %, indicating excellent rate capability and reversibility. Furthermore, the electrochemical impedance spectra showed improved electrode kinetics after cycling. These results indicate that the porous nanocrystalline TiO2 synthesized by this improved synthesis route might be a promising anode material for high energy and high power density lithium-ion battery applications.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 21003075), the Basic Research Program (Natural Science Foundation) of Jiangsu Province of China (No. BK2010558), the National Natural Science Foundation for Distinguished Young Scholars of China (No. 51025209), the U.S. Army Research Office under Grant #W911NF-09-1-0528, and the Chinese Academy of Sciences Visiting Professorship for Senior International Scientists (No. 2012T1G0015).
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Wang, J., Zhou, Y., Hu, Y. et al. Porous nanocrystalline TiO2 with high lithium-ion insertion performance. J Mater Sci 48, 2733–2742 (2013). https://doi.org/10.1007/s10853-012-7073-z
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DOI: https://doi.org/10.1007/s10853-012-7073-z