Synthesis of nanosheets-assembled lithium titanate hollow microspheres and their application to lithium ion battery anodes
Synthesis of nanosheets-assembled lithium titanate hollow microspheres and their application to lithium ion battery anodes
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DOI：
10.1016/j.electacta.2014.11.087
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发表时间：
2015
影响因子：
6.6
通讯作者：
Qian Zhou;Li Liu;Haipeng Guo;Rong Xu;Jinli Tan;Zichao Yan;Zhifeng Huang;H. Shu;Xiukang Yang-Xiukan
中科院分区：
文献类型：
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作者：
Qian Zhou;Li Liu;Haipeng Guo;Rong Xu;Jinli Tan;Zichao Yan;Zhifeng Huang;H. Shu;Xiukang Yang-Xiukan
中空微结构的分层组装具有很强的科学性和实用价值。本文介绍了水热法制备纳米片状Li4Ti5O12中空微球的方法。透射电子显微镜图像显示，这种Li4Ti5O12微球的直径为2μm，由中空的内腔和由纳米片组装的薄外壳组成。进一步阐述了该结构可能的生长机制。700℃焙烧的Li4Ti5O12空心微球表现出极好的电化学性能，包括高容量(3℃下147.3 mA/g−1)、优异的循环稳定性(3℃下100次循环后容量保持率95.0%)和显著的倍率性能(20℃下131.3 mA/g−1)。
Hierarchical assembly of hollow microstructures is of great scientificity and practical value. In this paper, a hydrothermal synthesis of Li4Ti5O12hollow microspheres assembled by nanosheets is introduced. Transmission electron microscopy (TEM) image shows that such Li4Ti5O12microspheres, with sizes of 2 μm in diameter, are composed of a hollow inner cavity and thin outer shell assembled by nanosheets. A possible growth mechanism of the structure is further expounded. The Li4Ti5O12hollow microspheres calcinated at 700 °C display extremely good electrochemical performance, including high capacity (147.3 mA h g−1at 3 C), excellent cyclic stability (95.0% capacity retention after 100 cycles at 3 C) and remarkable rate capability (131.3 mA h g−1at 20 C).