新型炭材料Issue(6)：428-434,7.
不同管径多壁碳纳米管与硫含量对锂硫电池单质硫正极电化学性能的影响
Preparation of multi-wall carbon nanotube/S composites as cathodes for lithium/sulfur batteries
摘要
Abstract
Multi-wall carbon nanotubes ( MWCNTs) with different diameters were ball-milled with different amounts of elemental sulfur for 2 h under an argon atmosphere, and then heated at 155℃ for 24 h followed by heating at 300℃ for 2 h to prepare MWC-NT/S composites. The composites were characterized by N2 adsorption, scanning and transmission electron microscopy, and elec-trochemical tests. It was found that the composite showing the best performance was the one in which the MWCNT diameter was in the range 10-20 nm and the sulfur content was 85 mass%. SEM confirms that the composite has a MWCNT-core and sulfur-shell structure. Sulfur not only covered the surface of the MWCNTs, but also filled the voids between the tubes. For the optimized com-posite the initial discharge capacity is 1272. 8mAh·g-1-sulfur and the capacity remaining after 80 cycles is 720. 1mAh·g-1-sulfur. Its active material utilization and capacity retention rates are 76. 0 and 64. 4%, respectively. The active material utilization and cycling performance of the composite are greatly improved compared with a sulfur electrode without the MWCNTs, owing to a high electri-cal conductivity of the MWCNTs and the stable structure of the composite.关键词
不同管径/多壁碳纳米管/锂硫电池/单质硫正极Key words
Different diameters/Multiwalled carbon nanotubes/Lithium-sulfur battery/Cathode material分类
信息技术与安全科学引用本文复制引用
陈君政,吴锋,陈人杰,李丽,陈实..不同管径多壁碳纳米管与硫含量对锂硫电池单质硫正极电化学性能的影响[J].新型炭材料,2013,(6):428-434,7.基金项目
科技部国际合作项目(2010DFB63370) （2010DFB63370）
国家高技术研究发展计划(863计划,2011AA11A256) （863计划,2011AA11A256）
国家自然科学基金项目(21373028) （21373028）
北京市科技新星计划(2010B018)@@@@International S &T Cooperation Program of China (2010DFB63370) （2010B018）
National 863 Program (2011AA11A256) （2011AA11A256）
National Natural Science Foundation of China (21373028) （21373028）
Beijing Novel Program (2010B018) （2010B018）
