Facile synthesis of nanosized Li4Ti5O12 in supercritical water
Facile synthesis of nanosized Li4Ti5O12 in supercritical water
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DOI：
10.1016/j.elecom.2011.03.037
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发表时间：
2011-06
影响因子：
5.4
通讯作者：
Agung Nugroho;Su Jin Kim;K. Chung;B. Cho;Youn-Woo Lee;Jaehoon Kim
中科院分区：
文献类型：
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作者：
Agung Nugroho;Su Jin Kim;K. Chung;B. Cho;Youn-Woo Lee;Jaehoon Kim
采用超临界水热合成法（SHS）制备了具有高倍率性能的钛酸锂（Li 4 Ti 5 O 12，LTO）。分析了其粒径、形貌、晶体结构和电化学性能，并与典型的固相法（SS）制备的LTO颗粒的性能进行了比较。具有高结晶度的纳米级LTO颗粒在非常短的反应时间（15分钟）内制备，随后在低温（700 °C）下煅烧，或者它可以在6小时内制备而无需煅烧。SHS颗粒的尺寸（20-200 nm，BET表面积为10-38 m2 g-1）比SS颗粒的尺寸（微米尺寸，BET表面积为5.4 m2 g-1）小得多。SHS LTO颗粒是高度相纯的，而SS颗粒具有杂质相，如金红石型TiO 2，金红石型TiO 2和Li 2 TiO 3。与SS LTO颗粒（149 mAhg − 1）相比，SHS LTO显示出更高的初始放电容量（212 mAhg − 1）和更好的循环稳定性。
The high rate capability of lithium titanate (Li4Ti5O12, LTO) is prepared using supercritical hydrothermal synthesis (SHS). The particle size, morphology, crystalline structure and electrochemical properties are analyzed and compared to the properties of LTO particles prepared using a typical solid-state method (SS). Nanosized LTO particles having a high crystallinity are produced in a very short reaction time (15 min) and with subsequent calcination at a low temperature (700 °C) or it can be produced in 6 h without calcination. The size of SHS particles is much smaller (20–200 nm, BET surface area of 10–38 m2g−1) than that of the SS particles (micron size, BET surface area of 5.4 m2g−1). The SHS LTO particles are highly phase-pure while the SS particles have impurity phases such as anatase TiO2, rutile TiO2and Li2TiO3. The SHS LTO show higher initial discharge capacity (212 mAhg−1) and better cycling stability compared to those of the SS LTO particles (149 mAhg−1).