银掺杂TiO_2纳米管阵列的制备及其锂电性能  

Preparation and Electrochemical Performances for Lithium-ion Battery of Ag Doped TiO_2 Nanotube Arrays

作　　者：孟瑞晋 侯宏英[1] 刘显茜[2] 刘松[1] 段继祥[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]昆明理工大学机电工程学院,昆明650093

出　　处：《人工晶体学报》2015年第8期2231-2236,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51363011);教育部第46批留学归国科研启动基金;云南省高层次引进人才工作经费资助项目(10978125);云南省人才培养项目(14118425);昆明理工大学重点学科建设项目(14078232);昆明理工大学先进电池膜电极材料方向团队(14078311)

摘　　要：采用银镜反应对阳极氧化法制备的三维有序TiO2纳米管阵列进行Ag掺杂,利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)以及X射线能量色散光谱仪(EDX)研究了复合Ag/TiO2纳米管阵列的微观结构及形貌;并进一步利用恒流充/放电、循环伏安(CV)及交流阻抗(AC)等方法测试其电化学性能。结果表明:复合Ag/TiO2纳米管的首次放电比容量为168 m Ah/g,高于纯TiO2纳米管的118 m Ah/g,且具有更好的稳定性能及倍率性能;性能改善的原因不仅得益于导电率的提高,而且得益于Ag作为负极材料时具有储锂活性。Three dimensional ordered TiO2 nanotube arrays prepared by anodization were modified with Ag via silver mirror reaction. The microstructure and morphology of as-prepared composite Ag/TiO2 nanotube arrays were studied in terms of X-ray diffraction （ XRD ） , scanning electron microscopy （ SEM ） and energy dispersive X-ray spectroscopy （EDX）. Furthermore, the electrochemical performances of Ag/ TiO2 nanotube arrays were investigated by galvanostatic charge/discharge, cyclic voltammograms （CV） and alternative current （AC） impedance spectroscope. The results show that composite Ag/TiO2 nanotubes electrode deliver an initial discharge capacity of 168 mAh/g, higher than 118 mAh/g of pure Ti02 nanotubes electrode. Meanwhile, Ag/TiO2 nanotubes electrode display better cycle stabilities and rate performances than bare TiO2 nanotubes electrode. Modified performances of composite Ag/TiO2 nanotubes electrode don＇T only benefit from increased conductivity but also from Li-storage activity of Ag doping.

关 键 词：阳极氧化 AG掺杂 TIO2纳米管阵列 锂离子电池 负极 

分 类 号：O646[理学—物理化学]