摘要
采用氧化石墨烯(grapheneoxide,GO)作为制备石墨烯的前驱体,通过液相还原自组装过程与硫纳米颗粒进行复合,获得了高性能的还原氧化石墨烯/硫(r GO/S)复合正极材料。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)、拉曼光谱、X射线光电子能谱分析(XPS)等对材料微观形貌与结构进行表征。结果表明:硫纳米颗粒均匀分布在石墨烯片层间,并且硫纳米颗粒被石墨烯片层有效地封装,硫在35-r GO/S复合物中的质量分数高达83.6%。该35-r GO/S复合正极在0.2C电流密度下初始放电容量可达1197.3mAh·g^-1,经过200次循环后容量仍保持在730mAh·g^-1左右,表现出优异的循环性能。
The high-performance reduced graphene oxide/sulfur(rGO/S)composite cathode was obtained by integrating sulfur nanoparticles with graphene oxide(GO)in liquid phase reduction by self-assembly process.The morphology and microstructure of the materials were characterized by scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffractometer(XRD),Raman spectroscopy and X-ray photoelectron spectroscopy(XPS).The results show that sulfur nanoparticles are uniformly distributed among the graphene sheets and effectively encapsulated by the graphene sheets.The mass fraction of sulfur in 35-rGO/S composite is as high as 83.6%.The initial discharge capacity of the 35-rGO/S composite cathode can reach 1197.3 mAh·g^-1 at a current density of 0.2 C,and the capacity remains 730 mAh·g^-1 after 200 cycles,manifesting outstanding cycling stability.
作者
吴旭
唐晓宁
黄鑫威
刘美丽
周文华
欧阳全胜
WU Xu;TANG Xiao-ning;HUANG Xin-wei;LIU Mei-li;ZHOU Wen-hua;OUYANG Quan-sheng(College of Materials and Metallurgy,Guizhou University,Guiyang 550025,China;Advanced Batteries and Materials Engineering Research Center,Guizhou Light Industry Technical College,Guiyang 550025,China;Graphene Materials Engineering Research Center of Guizhou Colleges and Universities,Guiyang 550025,China;Provincial Collaborative Innovation Center of Used Power Batteries Recycling,Guiyang 550025,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2021年第2期114-120,共7页
Journal of Materials Engineering
基金
贵州大学培育项目(黔科合平台人才[2017]5788)。
关键词
锂硫电池
石墨烯
自组装
硫纳米颗粒
lithium-sulfur battery
graphene
self-assembly
sulfur nanoparticle
作者简介
通讯作者:唐晓宁(1985-),女,实验师,博士,主要从事超级电容器研究,联系地址:贵州省贵阳市花溪区贵州大学材料与冶金学院(550025),E-mail:txn2004815@163.com。
