球形Li_4Ti_5O_(12)/C的制备及其电化学性能  

Preparation and electrochemical properties of spherical Li_4Ti_5O_(12)/C material

作　　者：王海侨[1] 穆鑫[1,2] 高剑[2] 何向明[2] 李建军[2] 

机构地区：[1]北京化工大学,北京100864 [2]清华大学核能与新能源技术研究院,北京100084

出　　处：《电源技术》2012年第2期158-160,共3页Chinese Journal of Power Sources

基　　金：国家自然科学基金项目(20903061);科技部"973"计划课题(2011CB935902)

摘　　要：采用喷雾干燥和高温固相法制备球形尖晶石型Li4Ti5O12,按计量比将TiO2、LiOH和可溶性淀粉三种化合物一起球磨混合成均匀浆料,通过喷雾干燥得到球形前驱体,再经过850℃热处理16 h制得碳包覆的球形Li4Ti5O12材料。通过X射线衍射光谱法(XRD)、扫描电子显微镜法(SEM)及电化学性能测试等分析手段表明,合成出的样品为纯相Li4Ti5O12;粉末颗粒呈球形,平均粒径约为15μm;0.1、1.0、2.0倍率下的首次放电比容量分别达到167.9、159.1、151.9 mAh/g,并表现出优良的充放电循环性能。The mixture of TiO2,LiOH and carbon source compounds was mixed evenly by ball milling,then the spherical spinel Li4Ti5O12 was synthesized via spray drying and high-temperature solid-state reaction method.XRD,SEM,TEM,BET testing and the determination of the electrochemical properties show that the prepared sample is pure Li4Ti5O12 phase.The particles are spherical and the average particle size is about 15 μm.The initial discharge specific capacities of the Li4Ti5O12/C reach 167.9,159.1 mAh/g and 151.9 mAh/g respectively at 0.1,1.0 C and 2.0 C rates.The material also exhibits excellent cycle performance.

关 键 词：LI4TI5O12 球形 包碳 倍率 

分 类 号：TM912.9[电气工程—电力电子与电力传动]