(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 以Li2CO3和納米TiO2為原料，通過二步煅燒固相反應(yīng)法制備Li4Ti5O12負(fù)極材料。研究前驅(qū)體球磨以及球磨時(shí)間對合成Li4Ti5O12樣品振實(shí)密度和電化學(xué)性能的影響。借助XRD、SEM、振實(shí)密度儀和充放電測試儀、電化學(xué)綜合測試儀表征Li4Ti5O12材料的物理性能和電化學(xué)性能。結(jié)果表明：球磨工藝能夠提高Li4Ti5O12的純度，并有效提高其振實(shí)密度和電化學(xué)性能；球磨時(shí)間為2 h時(shí)，所得材料的振實(shí)密度達(dá)1.70 g/cm3，0.1C首次放電比容量為174 mA∙h/g，5C放電比容量達(dá)124.2 mA∙h/g。
關(guān)鍵字: Li4Ti5O12；負(fù)極材料；振實(shí)密度；電化學(xué)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
