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Issue 33, 2010
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Facile synthesis of hierarchically porous Li4Ti5O12 microspheres for high rate lithium ion batteries

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Abstract

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 μm in diameter, exhibits rich hierarchical pores and a specific surface area of 57.5 m2 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 °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.

Graphical abstract: Facile synthesis of hierarchically porous Li4Ti5O12 microspheres for high rate lithium ion batteries

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Publication details

The article was received on 08 Feb 2010, accepted on 20 May 2010 and first published on 07 Jul 2010


Article type: Paper
DOI: 10.1039/C0JM00348D
Citation: J. Mater. Chem., 2010,20, 6998-7004
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    Facile synthesis of hierarchically porous Li4Ti5O12 microspheres for high rate lithium ion batteries

    L. Shen, C. Yuan, H. Luo, X. Zhang, K. Xu and Y. Xia, J. Mater. Chem., 2010, 20, 6998
    DOI: 10.1039/C0JM00348D

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