Graphitic Carbon Conformal Coating of Mesoporous TiO2 Hollow Spheres for High-Performance Lithium Ion Battery Anodes
- 2 October 2015
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 137 (40), 13161-13166
- https://doi.org/10.1021/jacs.5b08743
Abstract
Rational design and controllable synthesis of TiO2 based materials with unique microstructure, high reactivity, and excellent electrochemical performance for lithium ion batteries are crucially desired. In this paper, we developed a versatile route to synthesize hollow TiO2/graphitic carbon (H-TiO2/GC) spheres with superior electrochemical performance. The as-prepared mesoporous H-TiO2/GC hollow spheres present a high specific surface area (298 m2 g–1), a high pore volume (0.31 cm3 g–1), a large pore size (∼5 nm), well-defined hollow structure (monodispersed size of 600 nm and inner diameter of ∼400 nm, shell thickness of 100 nm), and small nanocrystals of anatase TiO2 (∼8 nm) conformably encapsulated in ultrathin graphitic carbon layers. As a result, the H-TiO2/GC hollow spheres achieve excellent electrochemical reactivity and stability as an anode material for lithium ion batteries. A high specific capacity of 137 mAh g–1 can be achieved up to 1000 cycles at a current density of 1 A g–1 (5 C). We believ...Keywords
Funding Information
- Science and Technology Commission of Shanghai Municipality (14JC1400700)
- University of Technology Sydney
- National Natural Science Foundation of China (21210004)
- Australian Research Council (DE140100619, FT110100800)
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