机械工程材料
MATERIALS FOR MECHANICAL ENGINEERING DOI;10.11973/jxgccl201711004
2017年11月第41卷第11期Vol41No.11Nov2017
锂离子电池负极用网络结构SnOz-C复合涂层的
微观结构及其性能
王娜，杨琪，崔帅，杨露
（上海工程技术大学材料工程学院，上海201620）
摘要：通过简单的刮涂工艺，将含有氯化亚锡、聚丙烯睛(PAN)和聚甲基丙烯酸甲酯(PM-MA)的二甲基甲酰胺(DMF)溶液涂覆在铜箔表面，然后在真空下嫂烧，制备出具有三维网络结构的SnO;-C复合涂层，对其微观结构进行了表征，并对该网络结构SnOz-C复合涂层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0.1～1um的碳基枝条相互连接而形成的连续三维网络结构，该碳基核条由无定型结构的碳基体、尺寸为10～150nm的SnO2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50mAg-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。
关键词：网络结构;SnO2;碳基体；循环性能；倍率性能
中图分类号：0646
文献标志码：A
文章编号：1000-3738(2017)11-0023-06
MicrostructureandPerformanceof SnOz-CCompositeCoatingwith
NetworkStructureUsedforLithiumIonBatteriesAnode
WANG Na, YANG Qi, CUI Shuai, YANG Lu
(School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China)
Abstract; The dimethylformamide (DMF) solution containing SnCl;, 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 SnO,-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 SnO,-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 o. 1 - 1 μm which consisted of amorphous carbon matrix, SnO; nano-particles with size of 10150 nm and micro-pores with size of 15 nm. When the composite coating was employed as anodes of lithium ion batteries, after 100 times cyeling under current density of 50 mA-g~', the composite coating electrodes exhibited specific capacity of 642 mAh+g1 without capacity fading during the cycling. The specific capacity of the electrodes under current density of 10 A-g was 43% of the specific capacity under current density of 50 mA · g", The composite coating had the good electrochemical performance.
Key words: network structure; SnOz ; carbon matrix; cyclic performance; rate performance
收稿日期：2016-09-27；修订日期：2017-09-21
基金项目：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）
作者简介：王娜（1994一），女，甘肃白银人，本科生
通信作者：杨琪副教授万方数据
0引言
锂离子电池由于具有输出电压高、比容量高、安全性高和环境友好等优点，广泛应用于电脑、手机等便携式电子产品中，并逐渐成为电动汽车和混合电