SnO_2/SiO_2复合材料的合成与电化学性能  

Synthesis and electrochemical property of SnO_2/SiO_2 composite

作　　者：吴诗德[1] 魏伟[1] 李超[1] 

机构地区：[1]郑州轻工业学院河南省表界面科学重点实验室,河南郑州450002

出　　处：《郑州轻工业学院学报（自然科学版）》2011年第1期43-46,共4页Journal of Zhengzhou University of Light Industry:Natural Science

基　　金：国家自然科学基金项目(20871107);河南省杰出青年科学基金项目(0612002700);河南省教育厅自然科学研究计划项目(2009A150031)

摘　　要：采用溶胶凝胶法制备了纳米SiO2微球,并在其表面包覆了一层SnO2.用X射线衍射仪及透射电镜对其进行了晶相和形貌分析.结果显示:SnO2被成功地包覆在SiO2表面,且包覆物保持了SiO2微球原有的分散性.将样品制备成锂离子电池负极材料,充放电测试表明:该种材料具有较好的电化学循环性能.与溶胶凝胶法制备的纯SnO2相比,尽管复合材料的首次充放电容量稍低,但经过20次循环后,复合材料的充放电容量分别高出105.6%和80.7%,说明用该方法制备的复合材料具有较好的应用前景.Nano-SiO2 microspheres were synthesized via sol-gel process,then SnO2 particles was coated on.The prepared composite was characterized by X ray diffraction and transmission electron microscopy,results showed that SnO2 was successfully coated on the surface of SiO2,and the composite still preserved the original good dispersion of SiO2 microsphere.The composite was then used as lithium ion battery anode material and its electrochemical property was tested,date showed that the composite had an excellent cycle performance.Compared with the pure SnO2,although the composite has a little lower charge-discharge capacity at first cycle.However,after 20 cycles its charge-discharge capacity was 105.6% and 80.7% more than the former,respectively.So the composite prepared by this method has a good application foreground.

关 键 词：溶胶凝胶法 SnO2/SiO2 包覆 分散性 电化学循环性能 

分 类 号：TM912.19[电气工程—电力电子与电力传动]