锂离子电池负极用网络结构SnO_2-C复合涂层的微观结构及其性能  

Microstructure and Performance of SnO_2-C Composite Coating with Network Structure Used for Lithium Ion Batteries Anode

作　　者：王娜 杨琪[1] 崔帅 杨露 WANG Na;YANG Qi;CUI Shuai;YANG Lu(School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China)

机构地区：[1]上海工程技术大学材料工程学院,上海201620

出　　处：《机械工程材料》2017年第11期23-28,共6页Materials For Mechanical Engineering

基　　金：上海市产学研合作计划项目(沪CXY-2015-017);上海市大学生创新项目(cs1605003)

摘　　要：通过简单的刮涂工艺,将含有氯化亚锡、聚丙烯腈(PAN)和聚甲基丙烯酸甲酯(PMMA)的二甲基甲酰胺(DMF)溶液涂覆在铜箔表面,然后在真空下煅烧,制备出具有三维网络结构的SnO_2-C复合涂层,对其微观结构进行了表征,并对该网络结构SnO_2-C复合涂层一体化负极材料的性能进行了测试。结果表明:该复合涂层具有由宽度为0.1~1μm的碳基枝条相互连接而形成的连续三维网络结构,该碳基枝条由无定型结构的碳基体、尺寸为10~150nm的SnO_2纳米粒子和尺寸为1~5nm的微孔组成;当该复合涂层直接用作锂离子电池的负极时,在50 mA·g^(-1)电流密度下经过100次循环后其比容量为642mAh·g-1,在此循环过程中未出现比容量衰减的现象,在10A·g-1电流密度下其比容量仍为50mA·g^(-1)电流密度下比容量的43%,该复合涂层表现出良好的电化学性能。The dimethylformamide（DMF）solution containing SnCl2,polyacrylonitrile（PAN）and poly（methyl methacrylate）（PMMA）was coated on the surface of Cu foils by simple knife coating,and then calcined in vacuum.The SnO2-C composite coating with three dimensional network structure was fabricated successfully.The micro-structure of the composite coating was characterized and the performance of network structure SnO2-C composite coating as lithium ion batteries anode was tested.The results show that the coating presented the continuous network structure formed by interconnected carbon based branches with width of 0.1-1μm which consisted of amorphous carbon matrix,SnO2 nano-particles with size of 10-150 nm and micro-pores with size of 1-5 nm.When the composite coating was employed as anodes of lithium ion batteries,after 100 times cycling under current density of 50 mA·g^-1,the composite coating electrodes exhibited specific capacity of 642 mAh·g^-1 without capacity fading during the cycling.The specific capacity of the electrodes under current density of 10 A·g^-1 was 43% of the specific capacity under current density of 50 mA·g-1.The composite coating had the good electrochemical performance.

关 键 词：网络结构 SNO2 碳基体 循环性能 倍率性能 

分 类 号：O646[理学—物理化学]