(湘潭大学 化学学院，环境友好化学与应用教育部重点实验室，湘潭 411105)
摘 要: 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155.62 mA·h/g。
关键字: 锂离子电池；Li4Ti5O12；乳酸；溶胶−凝胶法
（Key Laboratory of Environmentally Friendly Chemistry and Applications, Minister of Education,
School of Chemistry, Xiangtan University, Xiangtan 411105, China）
Abstract: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.
Key words: lithium ion battery; Li4Ti5O12; lactic acid; sol-gel method
