纳米结构SnO_2/碳纳米管复合电极的制备及其储锂性能

在含有十二烷基硫酸钠和SnCl2.2H2O的乙二醇溶液中加入纯化的碳纳米管,于160℃加热制备SnO2/CNTs复合材料,并以XRD,HRTEM,SEM等方法表征该材料的物相结构和表面形貌.结果表明SnO2纳米粒子均匀地覆盖在碳纳米管上,粒径小于10 nm.以其作为电极材料与锂片组装成扣式电池,恒流充放电测试.显示以该材料作为锂离子电池负极材料具有较高的比容量和良好的循环性能.

Preparation and Lithium Storage Performance of Nano-structural SnO2/Carbon Nanotubes Composite Electrodes

The Nano-structural SnO2/Carbon Nanotubes Composites were prepared in a solution of SnCl2,ethylene glycol(EG),purified MWCNTs and sodium dodecyl sulfate(SDS) at 160 ℃.The phase structure and surface morphology of the composites were measured by XRD HRTEM and SEM.The results indicate that there are high dispersions and high loadings of SnO2 nanoparticles on MWCNTs.Electrochemical lithium storage performance was studied preliminarily on the obtained samples.MWCNTs modified with SnO2 nanoparicles were shown to have a higher electrochemical reversible capacity than that of MWCNTs during the charge and discharge process.MWCNTs can accommodate the larger structure strain of the active materials produced during Li-ion insertion and extraction,which may improve the cycle performance of the electrode.