水热法合成高功率锂离子二次电池用球形Li4Ti5O12负极材料  

Hydrothermal Synthesis of Spherical Li_4Ti_5O_12 as Anode Material for High Power Lithium-Ion Secondary Battery

作　　者：闫慧[1] 张欢[1] 张鼎[1] 朱智[1] 其鲁[1] 

机构地区：[1]北京大学化学与分子工程学院,应用化学系,新能源材料与技术实验室,北京分子科学国家实验室,北京100871

出　　处：《物理化学学报》2011年第9期2118-2122,共5页Acta Physico-Chimica Sinica

基　　金：国家高技术研究发展计划项目(863) (2008AA11A102)资助~~

摘　　要：以球形TiO2和LiOH溶液为反应物,通过水热法合成了尖晶石型Li4Ti5O12,并使用X射线衍射(XRD)、傅里叶变换红外(FTIR)光谱、扫描电镜(SEM)和激光粒度分布(PSD)对其结构、形貌和电化学性能进行了表征.结果表明:通过该法得到的产品颗粒大小均匀,粒度分布狭窄,结构与标准Li4Ti5O12谱图一致.实验选定温度下所得的Li4Ti5O12均表现出良好的电化学性能.其中,800°C热处理所得样品的电化学性能最好,室温下,以35mA·g-1的电流密度进行充放电,其可逆容量达到162mAh·g-1,同时这种材料也表现出良好的倍率性能,即使在720mA·g-1的电流密度条件下进行充放电,其可逆容量仍可达到124mAh·g-1.Pure spinel-type lithium titanate,Li4Ti5O12, was successfully fabricated by a facile hydrothermal route using anatase TiO2 and LiOH solution as raw materials. The obtained samples were characterized by X-ray diffraction （XRD）, Fourier transform infrared （FTIR） spectroscopy, scanning electron microscopy （SEM）, and laser particle size distribution （PSD） analysis. The results showed that a spherical well-crystallized Li4Ti5O12 oxide was obtained at a calcination temperature of 800 ℃. The optimal Li4Ti5O12 also has excellent electrochemical performance, which reached 162 mAh·g^-1 at a current density of 35 mA·g^-1 and a good rate capability with a capacity reached 124 mAh·g^-1 even at a current density of 720 mA·g^-1.

关 键 词：水热法合成 球形 LI4TI5O12 电化学性能 锂离子二次电池 

分 类 号：TM912[电气工程—电力电子与电力传动]