改进固相法制备Li_4Ti_(4.95)Nb_(0.05)O_(12)及其性能研究  

Preparation and electrochemical properties study of Li_4Ti_(4.95)Nb_(0.05)O_(12) by improved solid phase method

作　　者：李军[1] 周燕[1] 唐盛贺[1] 陶熏[1] 

机构地区：[1]广东工业大学轻工化工学院,广东广州510006

出　　处：《功能材料》2013年第13期1856-1858,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(21206019);广东省科技计划资助项目(2012B050100010);广州市科技计划资助项目(2011Y1-00010)

摘　　要：为提高Li4Ti5O12的导电性和倍率性能,应用二步固相法制备了Nb掺杂的Li4Ti4.95Nb0.05O12负极材料,X射线衍射、扫描电镜、激光粒度分布仪、充放电测试、循环伏安和交流阻抗等测试结果表明,合成的样品具有单一的尖晶石结构和平稳的充放电平台,粒径分布均匀,Nb掺杂改性的Li4Ti5O12具有优良的电化学性能,0.1、0.5、1和10C首次放电比容量分别为174.1、159.7、147和123.3mAh/g。10C下,循环20次后容量保持为118.1mAh/g。Aiming at improving the electronic conductivity and high-rate performance of Li4Ti5O12,two-step solid phase sintering was adopted to prepare Li4Ti4.95Nb0.05O12 cathode materials.Their properties were studied by using X-ray diffraction（XRD）,scanning electron microscopy（SEM）,the charging and discharging tester and circulation current-voltage（CV） tests.The results showed that the samples with spine structure and stable charging and discharging platform,it had exhibited a uniform particle size distribution.Niobium doped lithium titanate has a good electrochemistry performance,at the charge-discharge rate of 0.1,0.5,1 and 10 C,its discharge special capacity was 174.1,159.7,147 and 123.3mAh/g respectively.After 20 cycles at 10C,its discharge capacity remained at 118.1mAh/g.

关 键 词：锂离子电池 Li4Ti4 95Nb0 05O12 负极材料 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]