(中南大学 冶金科学与工程学院，长沙 410083)
摘 要: 以Li2CO3和纳米TiO2为原料，通过二步煅烧固相反应法制备Li4Ti5O12负极材料。研究前驱体球磨以及球磨时间对合成Li4Ti5O12样品振实密度和电化学性能的影响。借助XRD、SEM、振实密度仪和充放电测试仪、电化学综合测试仪表征Li4Ti5O12材料的物理性能和电化学性能。结果表明：球磨工艺能够提高Li4Ti5O12的纯度，并有效提高其振实密度和电化学性能；球磨时间为2 h时，所得材料的振实密度达1.70 g/cm3，0.1C首次放电比容量为174 mA∙h/g，5C放电比容量达124.2 mA∙h/g。
关键字: Li4Ti5O12；负极材料；振实密度；电化学性能
two-step calcination process
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Li4Ti5O12 anode materials were prepared by solid-state reactions with two-step calcination process using Li2CO3 and nano-TiO2 as raw materials. The effects of ball-milling process and milling time on the performance of Li4Ti5O12 were investigated. The physical properties and electrochemical performance of Li4Ti5O12 were characterized by XRD, SEM, tap density dosimeter, charge-discharge tester and electrochemical workstation, respectively. The results show that ball-milling process can enhance the purity of products and obviously improve the tap-density and electrochemical properties of Li4Ti5O12. When the milling time is 2 h, the tap-density of Li4Ti5O12 is 1.70 g/cm3. The initial discharge specific capacity at a current density of 0.1C is 174 mA∙h/g, and 124.9 mA∙h/g at 5C.
Key words: Li4Ti5O12; anode material; tap-density; electrochemical performance
