One‐Pot Fabrication of Hierarchical Nanosheet‐Based TiO2–Carbon Hollow Microspheres for Anode Materials of High‐Rate Lithium‐Ion Batteries |
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Authors: | Zhaokui Jin Prof Mu Yang Jingjing Wang Hongyi Gao Prof Yunfeng Lu Prof Ge Wang |
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Institution: | 1. School of Materials and Engineering, University of Science and Technology Beijing, Haidian district, P.R. China;2. Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA, USA |
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Abstract: | Hierarchical and hollow nanostructures have recently attracted considerable attention because of their fantastic architectures and tunable property for facile lithium ion insertion and good cycling stability. In this study, a one‐pot and unusual carving protocol is demonstrated for engineering hollow structures with a porous shell. Hierarchical TiO2 hollow spheres with nanosheet‐assembled shells (TiO2 NHS) were synthesized by the sequestration between the titanium source and 2,2′‐bipyridine‐5,5′‐dicarboxylic acid, and kinetically controlled etching in trifluoroacetic acid medium. In addition, annealing such porous nanostructures presents the advantage of imparting carbon‐doped functional performance to its counterpart under different atmospheres. Such highly porous structures endow very large specifics surface area of 404 m2 g?1 and 336 m2 g?1 for the as‐prepared and calcination under nitrogen gas. C/TiO2 NHS has high capacity of 204 mA h g?1 at 1 C and a reversible capacity of 105 mA h g?1 at a high rate of 20 C, and exhibits good cycling stability and superior rate capability as an anode material for lithium‐ion batteries. |
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Keywords: | doping electrochemistry titanium lithium nanostructures |
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