(湘潭大學 化學學院，環(huán)境友好化學與應用教育部重點實驗室，湘潭 411105)
摘 要: 以乳酸(LA)為配位劑，Ti(OC4H9)4和LiAc·2H2O為原料，通過溶膠−凝膠法制備具有優(yōu)良電化學性能的電極材料Li4Ti5O12。采用熱重分析(TG)、X射線衍射(XRD)、掃描電鏡(SEM)、恒流充放電以及循環(huán)伏安(CV)等方法對合成的材料進行結(jié)構(gòu)表征和電化學性能測試。結(jié)果表明：在800 ℃燒結(jié)18 h制備的樣品顆粒分布均勻、結(jié)晶度良好、電化學性能優(yōu)良。 0.5 C倍率的首次放電比容量為184.32 mA·h/g，50次循環(huán)后仍然保持在155.62 mA·h/g。
關鍵字: 鋰離子電池；Li4Ti5O12；乳酸；溶膠−凝膠法
YANG Shun-yi, WANG Hong, SHU Hong-bo, BAI Li
（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
