钛酸铜锂纳米粒子的制备及其电化学性能研究  

Synthesis of Li_2CuTi_3O_8 Nanoparticles and Their Performance as Anode in Lithium-Ion Battery Application

作　　者：肖启振[1] 吴丽君[1] 李晶[2] 郝敬磊[1] 

机构地区：[1]湘潭大学化学学院,湖南湘潭411105 [2]天津出入境检验检疫局,天津300201

出　　处：《湘潭大学自然科学学报》2013年第2期41-45,51,共6页Natural Science Journal of Xiangtan University

基　　金：中国博士后科学基金面上资助项目(20090461013)

摘　　要：采用静电纺丝和热处理技术成功制备了新型锂离子电池负极材料钛酸铜锂(Li2CuTi3O8)纳米粒子.通过扫描电子显微镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)、热分析(TG-DTA)、循环伏安法(CV)、恒流充放电和电化学交流阻抗(EIS)等测试手段对材料的形貌、结构、物相及电化学性能进行了表征和研究.结果表明所制备的Li2CuTi3O8纳米粒子具有良好的立方尖晶石结构,粒度分布均匀,粒径约为100～200nm.充放电测试显示,当电流密度为25mA g-1时,Li2CuTi3O8纳米材料的首次可逆容量为245.3mAh g-1;且该电极在50,100,200,500,1 000mA g-1的电流密度下循环10次后,放电比容量分别为189.2,186.1,176.9,152.2,127.5mAh g-1当电流密度再回到25mA g-1时,比容量仍然可达到228.6mAh g-1,该材料显示出良好的循环稳定性和倍率性能,有望成为锂离子电池新型负极材料.Novel Li2CuTi3O8 nanoparticles are synthesized by electrospinning method and thermal trea- ting, which are utilized as an anode material for reehargeable lithium-ion batteries. The Li2CuTi3O8 sample is characterized by scanning electron microscopy （SEM）, transmission electron microscopy （TEM}, X-ray diffraction{ XRD） and thermal analysis （TG-DTA）. The results show that the pure-phase uniform Li2CuTi3O8 nanoparticles with an average diameter of 100-200 nm are obtained. Electrochemical characterization by Cyclic Vohammetry （CV）, galvanostatie charge-discharge tests and electrochemical impedance spectroscopy demonstrate that the cell assembled with this as-prepared Li2CuTi3O8 shows good cycling capacity and rate capability. The obtained results show that Li2CuTi3O8 is a highly promising anode material for lithium-ion battery application.

关 键 词：静电纺丝 纳米粒子 Li2CuTi3O8 负极 锂离子电池 

分 类 号：TM912[电气工程—电力电子与电力传动]