Graphitic Carbon Conformal Coating of Mesoporous TiO2 Hollow Spheres for High-Performance Lithium Ion Battery Anodes

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• 作者：Hao Liu ; Wei Li ; Dengke Shen ; Dongyuan Zhao ; Guoxiu Wang
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：October 14, 2015
• 年：2015
• 卷：137
• 期：40
• 页码：13161-13166
• 全文大小：476K
• ISSN：1520-5126

文摘

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^鈥?), a high pore volume (0.31 cm³ g^鈥?), a large pore size (鈭? nm), well-defined hollow structure (monodispersed size of 600 nm and inner diameter of 鈭?00 nm, shell thickness of 100 nm), and small nanocrystals of anatase TiO₂ (鈭? 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^鈥? can be achieved up to 1000 cycles at a current density of 1 A g^鈥? (5 C). We believe that the mesoporous H-TiO₂/GC hollow spheres are expected to be applied as a high-performance electrode material for next generation lithium ion batteries.