Jin Yun-Ho, Min Kyung-Mi, Shim Hyun-Woo, Seo Seung-Deok, Hwang In-Sung, Park Kyung-Soo, Kim Dong-Wan
Department of Materials Science and Engineering, Ajou University, Suwon 443-749, South Korea.
Nanoscale Res Lett. 2012 Jan 5;7(1):10. doi: 10.1186/1556-276X-7-10.
One of the most promising anode materials for Li-ion batteries, Li4Ti5O12, has attracted attention because it is a zero-strain Li insertion host having a stable insertion potential. In this study, we suggest two different synthetic processes to prepare Li4Ti5O12 using anatase TiO2 nanoprecursors. TiO2 powders, which have extraordinarily large surface areas of more than 250 m2 g-1, were initially prepared through the urea-forced hydrolysis/precipitation route below 100°C. For the synthesis of Li4Ti5O12, LiOH and Li2CO3 were added to TiO2 solutions prepared in water and ethanol media, respectively. The powders were subsequently dried and calcined at various temperatures. The phase and morphological transitions from TiO2 to Li4Ti5O12 were characterized using X-ray powder diffraction and transmission electron microscopy. The electrochemical performance of nanosized Li4Ti5O12 was evaluated in detail by cyclic voltammetry and galvanostatic cycling. Furthermore, the high-rate performance and long-term cycle stability of Li4Ti5O12 anodes for use in Li-ion batteries were discussed.
作为锂离子电池最具潜力的阳极材料之一，Li4Ti5O12因其是具有稳定嵌入电位的零应变锂嵌入主体而备受关注。在本研究中，我们提出了两种不同的合成方法，利用锐钛矿型TiO2纳米前驱体制备Li4Ti5O12。首先通过在100°C以下的尿素强制水解/沉淀路线制备出具有超过250 m2 g-1超大表面积的TiO2粉末。为了合成Li4Ti5O12，分别将LiOH和Li2CO3添加到在水和乙醇介质中制备的TiO2溶液中。随后将粉末干燥并在不同温度下煅烧。使用X射线粉末衍射和透射电子显微镜对从TiO2到Li4Ti5O12的相和形态转变进行了表征。通过循环伏安法和恒电流循环详细评估了纳米级Li4Ti5O12的电化学性能。此外，还讨论了用于锂离子电池的Li4Ti5O12阳极的高倍率性能和长期循环稳定性。
