摘要
以多壁碳纳米管/氮化钒复合材料(MWCNT⁃VN)作为锂硫电池正极载体材料,利用VN的空心结构储存硫和限制多硫化物的穿梭效应。另外,MWCNT形成了一个导电网络,进一步提升了正极的导电性能。在1C的电流密度下,VN/S电极与MWCNT⁃VN/S电极的初始放电比容量分别为702.2和809.3 mAh·g^(-1),经过350圈循环后,每圈衰减量均小于0.1%。与单纯VN/S相比,所得MWCNT⁃VN复合材料的电化学性能均有提升,如较高的锂离子迁移率、稳定的倍率性能和长循环稳定性。
Multi⁃walled carbon nanotube/vanadium nitride composite(MWCNT⁃VN)was used as the positive electrode carrier material of lithium⁃sulfur battery,and sulfur was stored through the hollow structure of vanadium nitride,and it can also effectively limit the shuttle effect of polysulfide.In addition,carbon nanotubes can form a conductive network,which further improves the conductive performance.The initial capacities were 702.2 and 809.3 mAh·g^(-1) for VN/S and MWCNT⁃VN/S cathode at a current density of 1C,respectively.After 350 chargedischarge cycles,the capacity attenuation was about 0.1%per cycle.Compared with pure VN/S,the electrochemical performance of the obtained MWCNT⁃VN/S was improved,such as high lithium ion mobility,stable rate performance and excellent long⁃cycle stability.
作者
陈平
刘逸然
潘沛锋
方亚男
单淇
冯晓苗
刘瑞卿
林秀婧
马延文
CHEN Ping;LIU Yi-Ran;PAN Pei-Feng;FANG Ya-Nan;SHAN Qi;FENG Xiao-Miao;LIU Rui-Qing;LIN Xiu-Jing;MA Yan-Wen(School of Materials Science&Engineering,Institute of Advanced Materials(IAM),Jiangsu National Synergistic Innovation Center for Advanced Materials(SICAM),Nanjing University of Posts&Telecommunications,Nanjing 210023,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2021年第7期1184-1190,共7页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.51772157,21805140,61504062)
江苏省自然科学基金(No.BK20150863,BK20160890)
江苏省六大人才高峰(No.2015⁃JY⁃015)资助。
关键词
锂硫电池
氮化钒
碳纳米管
正极
lithium⁃sulfur batteries
vanadium nitride
carbon nanotube
cathode
