Li_4Ti_5O_(12)的溶胶-凝胶合成及其电化学性能

Sol-gel synthesis and electrochemical performance of Li_4Ti_5O_(12)

以乳酸(LA)为配位剂,Ti(OC4H9)4和LiAc.2H2O为原料,通过溶胶-凝胶法制备具有优良电化学性能的电极材料Li4Ti5O12。采用热重分析(TG)、X射线衍射(XRD)、扫描电镜(SEM)、恒流充放电以及循环伏安(CV)等方法对合成的材料进行结构表征和电化学性能测试。结果表明:在800℃烧结18 h制备的样品颗粒分布均匀、结晶度良好、电化学性能优良。0.5 C倍率的首次放电比容量为184.32 mA.h/g,50次循环后仍然保持在155.62mA.h/g。

The electrode material Li4Ti5O12 with excellent electrochemical properties was synthesized by a sol-gel method using lactic acid（LA） as chelating agent,tetrabutyl titanate and lithium acetate dihydrate as raw materials.The structure and electrochemical properties of Li4Ti5O12 samples were determined by thermogravimetry（TG）,X-ray diffractometry（XRD）,scanning electron microscopy（SEM）,charge-discharge cycling and cyclic voltammogram（CV）.The results indicate that Li4Ti5O12 synthesized at 800 ℃ for 18 h has fine crystallization,uniform particle distribution and good electrochemical performance.The initial discharge capacity is 184.32 mA·h/g,and the discharge capacity remains 155.62 mA·h/g after 50 charge-discharge cycles at 0.5 C rate.