文献类型：期刊文献

英文题名：Sulfur film sandwiched between few-layered MoS2 electrocatalysts and conductive reduced graphene oxide as a robust cathode for advanced lithium-sulfur batteries

作者：Wei, Yanju[1];Kong, Zhenkai[1];Pan, Yankai[1];Cao, Yueqiang[1];Long, Donghui[1,2];Wang, Jitong[1,2];Qiao, Wenming[1,2];Ling, Licheng[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Specially Funct Polymer Mat & Related Tec, Shanghai 200237, Peoples R China

年份：2018

卷号：6

期号：14

起止页码：5899

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20181504995719);WOS:【SCI-EXPANDED(收录号:WOS:000431506600049)】；

基金：This work was supported by the Ministry of Science and Technology of the People's Republic of China (2014CB239702) and National Natural Science Foundation of China (No. 21576090), and Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

外文关键词：Cathodes - Electrocatalysis - Graphene - Lithium compounds - Electrocatalysts - Sulfur compounds - Lithium sulfur batteries - Layered semiconductors - Reaction kinetics - Electrolysis - Lithium batteries - Redox reactions

摘要：Improving the capacity retention and reaction kinetics of sulfur cathodes is critical to realizing high-performance lithium-sulfur (Li-S) batteries. In this contribution, few-layered MoS2 nanosheets as electrocatalysts are introduced into the Li-S system by developing a novel sandwich-type MoS2/sulfur/reduced graphene oxide (MoS2/S/rGO) composite cathode. The sandwiched sulfur film has a synergistic coupling effect with both the MoS2 electrocatalyst layer and the conductive rGO substrate, enabling a robust hybrid structure with strong interfacial interactions for physical entrapment of intermediate lithium polysulfides (LiPSs) during cycling. More importantly, the MoS2 electrocatalysts are bifunctional in regulating sulfur reaction chemistry, and could chemically immobilize LiPSs via Li-S bonds and also kinetically accelerate sulfur redox reactions, especially for the mutual conversions between soluble LiPSs and solid Li2S2/Li2S. These merits with regard to structure and chemistry enable the MoS2/S/rGO cathode with superior rate capability (reversible capacities of 657 and 553 mA h g(-1) at high rates of 7 and 10C, respectively), and long-term cycling stability (a slow capacity decay of 0.037% per cycle at 2C over 1000 cycles). This work provides a new pathway to establish a multifaceted cathode structure by rationally integrating the concepts of physical confinement, chemical adsorption and electrocatalysis for advanced Li-S batteries.