碳纳米管自交织薄膜载网的构建及用于电池中的沉积分析  

Carbon Nanotubes Self-Interlacing Transmission Electron Microscopy Grids for Electrodeposition Characterizations in Batteries

作　　者：陈芳[1] 张魏栋 沈泽宇 陆盈盈[2] CHEN Fang;ZHANG Wei-Dong;SHEN Ze-Yu;LU Ying-Ying(Department of Chemistry,Zhejiang University,Hangzhou 310027,China;College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学化学系,杭州310027 [2]浙江大学化学工程与生物工程学院,杭州310027

出　　处：《分析化学》2024年第7期1012-1019,共8页Chinese Journal of Analytical Chemistry

基　　金：国家重点研发计划项目(No.2018YFA0209600);浙江省分析测试项目(No.LGC22B050001)资助

摘　　要：透射电子显微镜(TEM)能提供材料在纳米尺度的化学信息与空间信息,是研究电池材料结构和反应机理必不可少的表征工具.由于TEM要求测试样品的厚度<0.1μm,通常的电极表面材料需要采用聚焦离子束刻蚀、超薄切片或超声分散等方法处理后才能用于TEM观测,而这些前处理过程极有可能丢失最真实的电极表面结构.本研究在常规TEM的铜载网上利用刮涂法制备碳纳米管自交织薄膜层,通过研究不同浓度下碳纳米管的交织状况,优化了交织膜的厚度和覆盖区域,制得新型TEM载网.将此载网作为电池正极,用于电池中电极沉积物的获取和TEM分析,得到电极表面高清晰显微结构图像.本研究为研究高能量密度金属负极中的沉积/剥离机制提供了制样新思路.Transmission electron microscopy(TEM)is considered as an important characterization tool for revealing morphology of materials and an indispensable strategy for studying the mechanisms of charge-discharge process in battery.TEM samples needs be less than 0.1μm thick,which means electrodeposited materials must undergo pre-treatment processes such as focusing ion beam etching,ultra-thin slicing,or ultrasonic dispersion before they can be observed via TEM.However,such treatments cause structure changes,and what real formed in electrodes is hard to estimate.In this work,a self-interlacing film layer composed of carbon nanotubes(CNTs)was fabricated on a copper grid through blade coating.A novel TEM grid was produced by optimizing the interlacing film's thickness and covering area through adjusting the interlacing state of various concentrations of CNTs.Utilizing the novel TEM grid as the battery's positive electrode,electrode deposits were acquired and subjected to TEM analysis to generate high-definition microstructure images of the electrode surface.This process provided new insights into sample preparation for investigating the deposition/stripping mechanism in high-energy-density metal anodes.

关 键 词：碳纳米管 载网 电沉积 扫描电子显微镜 透射电子显微镜 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TM91[电气工程—电力电子与电力传动]