School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798.
ACS Appl Mater Interfaces. 2013 Oct 23;5(20):9998-10003. doi: 10.1021/am4022494. Epub 2013 Oct 2.
A facile green method to synthesize uniform nanostructured urchinlike rutile TiO2 is demonstrated. Titanium trichloride was selected as the TiO2 precursor, and a mixed solvent containing H2O and ethylene glycol was used. By using this binary medium, the nucleation and crystal growth of rutile TiO2 can be regulated, giving rise to very uniform urchinlike structures with tailorable sizes. As confirmed by the SEM and TEM analysis, large particles with dense aggregation of needle-like building blocks or small ones with loosely packed subunits could be obtained at different reaction conditions. The as-prepared samples were applied as the anode material for lithium-ion batteries, and they were shown to have superior properties with a high reversible capacity of 140 mA h g(-1) at a high current rate of 10 C for up to 300 cycles, which is almost unmatched by other rutile TiO2-based electrodes. A stable capacity of 88 mA h g(-1) can also be delivered at an extremely high rate of 50 C, suggesting the great potential of the as-prepared product for high-rate lithium-ion batteries.
一种简便的绿色方法被用于合成均匀的纳米结构刺猬状锐钛矿 TiO2。三氯化钛被选为 TiO2 前体，使用含有 H2O 和乙二醇的混合溶剂。通过使用这种二元介质，可以调节锐钛矿 TiO2 的成核和晶体生长，得到具有可调节尺寸的非常均匀的刺猬状结构。SEM 和 TEM 分析证实，在不同的反应条件下，可以得到具有密集聚集的针状构建块的大颗粒或具有松散堆积的亚单位的小颗粒。所制备的样品被用作锂离子电池的阳极材料，它们具有优异的性能，在高电流速率为 10 C 时，具有高达 140 mA h g(-1)的高可逆容量，这在其他基于锐钛矿 TiO2 的电极中几乎是无与伦比的。在极高的速率 50 C 下，也可以提供 88 mA h g(-1)的稳定容量，这表明所制备的产品在高倍率锂离子电池中有很大的潜力。
