文献类型：期刊文献

英文题名：Synergistic electrocatalysis of polysulfides by a nanostructured VS4-carbon nanofiber functional separator for high-performance lithium-sulfur batteries

作者：Zhang, Yongzheng[1];Xu, Guixin[1];Kang, Qi[2];Zhan, Liang[1];Tang, Weiqiang[3,4];Yu, Yaxin[3,4];Shen, Kaili[1];Wang, Hucheng[1];Chu, Xuan[1];Wang, Jinyun[1];Zhao, Shuangliang[3,4];Wang, Yanli[1];Ling, Licheng[1];Yang, Shubin[5]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Key Lab Specially Funct Polymers & Related Techno, Minist Educ,State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Shanghai Jiao Tong Univ, Shanghai Key Lab Elect Insulat & Thermal Aging, Dept Polymer Sci & Engn, Shanghai 200240, Peoples R China;[3]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[5]Beihang Univ, Sch Mat Sci & Engn, Key Lab Aerosp Adv Mat & Performance, Minist Educ, Beijing 100191, Peoples R China

年份：2019

卷号：7

期号：28

起止页码：16812

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20192907210469);WOS:【SCI-EXPANDED(收录号:WOS:000476599900019)】；

基金：This work was financially supported by the National Science Foundation of China (51472086, 51002051, U1710252, 91834301) and the National Key R&D Program of China (No. 2018YFB0104200). W. T. is grateful to the China Scholarship Council and British Council for the visiting fellowship. We also thank Dr Hu Pengfei, who serves in the Instrumental Analysis and Research Center of Shanghai University, for his help in the microstructural characterization and analysis of materials.

语种：英文

外文关键词：Defects - Electrocatalysts - Electrocatalysis - Lithium batteries - Polysulfides - Separators - Reaction kinetics - Lithium compounds - Protective coatings - Carbon nanofibers

摘要：The sluggish redox kinetic and the severe shuttle effect remain the key issues for the application of lithium-sulfur batteries, resulting in low sulfur utilization and rapid capacity fading. Herein, a nanostructured VS4 anchored on defect-rich carbon nanofibers (CNF-VS4) was coated on the commercial separator as both physical blocks to mitigate the shuttle effects and as an electrocatalyst to enhance the reaction kinetics of polysulfides/Li2S. Besides, polar nanostructured VS4 shows a high affinity to polysulfides, and conductive CNF network serves as "second collector" to trap and reutilize the active materials. The functional coating layer also provides rich defects for the dispersion and stabilization of Li2S. When the CNF-VS4 functional separator based on a high-sulfur content (80 wt%) cathode was applied in Li-S batteries, a high initial capacity of 1135 mA h g(-1) at 0.2C and a superior rate capacity of 780 mA h g(-1) at 2C were achieved. Even under a higher rate (5C), it still delivered a stable capacity of 300 mA h g(-1) over 1000 cycles with a high coulombic efficiency of 95%.