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One‐Pot Fabrication of Hierarchical Nanosheet‐Based TiO 2 –Carbon Hollow Microspheres for Anode Materials of High‐Rate Lithium‐Ion Batteries
Author(s) -
Jin Zhaokui,
Yang Mu,
Wang Jingjing,
Gao Hongyi,
Lu Yunfeng,
Wang Ge
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201505099
Subject(s) - nanosheet , materials science , anode , calcination , chemical engineering , lithium (medication) , nanotechnology , nanostructure , titanium , carbon fibers , composite material , catalysis , electrode , composite number , organic chemistry , chemistry , metallurgy , medicine , endocrinology , engineering
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 TiO 2 hollow spheres with nanosheet‐assembled shells (TiO 2 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 m 2 g −1 and 336 m 2 g −1 for the as‐prepared and calcination under nitrogen gas. C/TiO 2 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.