期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 20, 期 33, 页码 6998-7004出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm00348d
关键词
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资金
- National Basic Research Program of China (973 Program) [2007CB209703]
- National Natural Science Foundation of China [206033040, 20873064]
A novel approach has been developed to synthesize hierarchically porous Li4Ti5O12 microspheres assembled by well-crystalline nanoparticles. The fabrication process is very simple, involving only hydrothermal treatment of commercial anatase TiO2 powder in LiOH solution and a following calcination procedure without employing any surfactants or templates. Field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and nitrogen adsorption/desorption analysis were used to characterize their morphologies and structures. Such Li4Ti5O12 nano/microspherical superstructures, with sizes of ca. 4 mu m in diameter, exhibits rich hierarchical pores and a specific surface area of 57.5 m(2) g(-1). A possible growth mechanism of the nano/microspherical superstructure is further discussed. The calcination temperature has a great effect on the crystal structure and electrochemical properties of the materials. The hierarchically porous Li4Ti5O12 microspheres annealed at 700 degrees C have the perfect crystallization and optimal particle size, which can deliver good coulombic efficiency, ultrahigh rate capability at high rates, and excellent capacity retention over 200 cycles.
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