(中南大學 冶金科學與工程學院，長沙 410083)
摘 要: 以納米TiO2和Li2CO3為原料，通過固相反應法制備負極材料Li4Ti5O12，研究焙燒溫度和時間對合成Li4Ti5O12樣品電化學性能的影響。利用TG、XRD、SEM 和充放電測試表征Li4Ti5O12的物理性能和充放電性能。結果表明：焙燒溫度的選擇比延長焙燒時間對Li4Ti5O12的性能影響更大，提高焙燒溫度和延長焙燒時間，都能夠促進晶體結構的完整，改善材料的電化學性能；經(jīng)800 ℃焙燒24 h得到的Li4Ti5O12首次放電容量為167 mA∙h/g，經(jīng)過80次充放電循環(huán)，容量幾乎沒有衰減；對Li4Ti5O12充電到0.5 V，充電曲線上均觀察到明顯的極化現(xiàn)象，極化程度同活性物質的顆粒大小和結合情況有關。
關鍵字: Li4Ti5O12；負極材料；物理性能；電化學性能
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Anode materials Li4Ti5O12 were prepared by one-step solid-state reaction using Li2CO3 and nano-TiO2 as precursors, and the effects of sintering temperature and time on the performance of Li4Ti5O12 were investigated. The physical properties and charge-discharge performance of Li4Ti5O12 were characterized by TG analysis, XRD, SEM and electrochemical measurement, respectively. The results show that the selection of sintering temperature is more important than extension of sintering time, and the extension of sintering temperature and time can improve the crystal structure and electrochemical performance of Li4Ti5O12. The initial discharge capacity is 167 mA∙h/g for the samples prepared at 800 ℃ for 24 h, and without capacity fading almost after 80 cycles. Polarization is clearly observed on the charge curves of Li4Ti5O12 when charged to 0.5 V, the extent of polarization is related to Li4Ti5O12 particle size and integration of particles.
Key words: Li4Ti5O12; anode materials; physical properties; electrochemical performance
