CNF/Fe在锂硫电池正极中的应用  

Application of CNF/Fe in cathode of lithium/sulfur battery

作　　者：杨学兵[1] 王传新[1] 汪建华[1] 张行[1] 

机构地区：[1]武汉工程大学湖北省等离子体化学与新材料重点实验室,湖北武汉430074

出　　处：《武汉工程大学学报》2011年第5期53-56,共4页Journal of Wuhan Institute of Technology

基　　金：国家重点基础研究发展计划资助项目(2011CB201600);湖北省自然科学基金(2007ABA006);湖北省教育厅重点项目(2007)

摘　　要：以铁粉(Fe)为催化剂,通过热丝化学气相沉积的方法制备纳米碳纤维(CNF),得到CNF/Fe复合粉体,后将其代替乙炔黑用于锂硫电池正极.采用扫描电子显微镜和X射线衍射的方法对CNF/Fe进行表面形貌和结构表征,采用恒流放电和交流阻抗测量法对正极进行电化学性能测试.结果表明,制备的CNF/Fe中CNF的直径在200 nm附近.在0.2 mA/cm2的电流密度下充放电,含有CNF/Fe的正极在2.0 V附近出现长的放电平台,正极中硫的初次放电比容量达801 mAh/g,40次循环后的可逆放电比容量仍有498 mAh/g.Carbon nanofiber（CNF） was prepared by hot filament chemical vapor deposition（HFCVD） with iron（Fe） powder as catalyst.The composite powder of CNF/Fe then replaced acetylene black and was used in the cathode of lithium/sulfur battery.Methods of scanning electron microscopy and X-ray diffraction were adopted to characterize the surface features and structure.Moreover,The electrochemical performance of cathode was tested by methods of galvanostatic discharge and measurement of alternating current impedance.Results indicate that the diameter of prepared CNF is about 200 nanometer.When discharge current density is 0.2 mA/cm2,cathode containing CNF/Fe shows a long discharge platform at around 2.0 V.Initial discharge specific capacity of sulfur in the cathode with CNF/Fe is 801 mAh/g.After 40 cycles,the reversible discharge specific capacity is 498 mAh/g.

关 键 词：热丝化学气相沉积 纳米碳纤维/铁(CNF/Fe) 正极材料 锂硫电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]