微孔碳@硫复合材料的制备及其锂硫电池性能  

Preparation of microporous carbon@sulfur composite and its performance for lithium-sulfur battery

作　　者：罗艳[1] 曹洁明[1] 李念武[1] 张松涛[1] 姬广斌[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院纳米材料研究所,江苏南京210016

出　　处：《化学研究》2015年第2期185-190,共6页Chemical Research

基　　金：国家自然科学基金(51202106;51172109)

摘　　要：针对锂硫电池研究中硫单质电导率低和多硫化锂易溶解于电解液的问题,制备了一种核壳结构的碳纳米管(CNT@C)作为硫载体,碳纳米管外壳包覆的碳层中的微孔能吸附多硫化锂,从而抑制多硫离子扩散.X射线衍射(XRD),透射电子显微镜(TEM)和扫描电子显微镜(SEM)表征结果表明硫均匀负载在核壳结构碳纳米管上.电化学测试结果表明这种核壳结构的复合材料有较高容量和良好的循环性能.The development of lithium‐sulfur battery has been hindered by the poor conductivity of sulfur and the dissolution of lithium polysulfides in the electrolyte .In this paper ,the core‐shell structured nanotube （CNT@ C） was designed to overcome these shortcomings .The as‐prepared CN T@ C can improve the conductivity of sulfur and restrain the diffusion of polysul‐fide ions by microporous carbon coating as well .X‐ray diffraction （XRD） ,transmission elec‐tron microscopy （TEM ） and scanning electron microscopy （SEM ） were used to measure the nanocomposites .The results indicated that elemental sulfur was uniformly distributed across the core‐shell carbon nanotube .The electrochemical experiment showed that the core‐shell composite has high capacity and good cycle performance .

关 键 词：锂硫电池 核壳结构 碳纳米管 微孔 硫 

分 类 号：TM912.9[电气工程—电力电子与电力传动] TQ152[化学工程—电化学工业]