An integrated cathode with bi-functional catalytic effect for excellent-performance lithium-sulfur batteries

查看全文 作　　者：Mengmeng [1,2]Zhen;Xintao [1]Zuo;Juan [1]Wang;Cheng [1]Wang

机构地区：[1]Tianjin Key Laboratory of Advanced Functional Porous Materials and Center far Electron Microscopy,Institute for New Energy Materials & Low-Carbon Technologies,School of Materials Science and Engineering,Tianjin University of Technology,Tianjin 300071,China;[2]Tianjin Key Laboratory of Clean Energy and Pollution Control,School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China

出　　处：《Nano Research》索引2019年第12卷第5期,共8页

基　　金：the Postdoctoral Science Foundation of China (No. 2017M611171);the National Natural Science Foundation of China (Nos. 21571170, 2150116& and 51702236);Tianjin Municipal Science and Technology Commission (No. 17JCZDJC38000). 摘　　要：The high energy density of lithium-sulfur batteries (LSBs) is mainly based on the complex redox reactions and phase conversions.The sluggish redox kinetics and the large accumulation of soluble polysulfides in the electrolyte leads to low sulfur utilization and serious shuttle effect.Herein,an integrated sulfur cathode is constructed through a facile and large-scale method.It is composed of sulfur-N,S doped bamboo like CNTs@Co3S4 (NSC@Co3S4) composites on polypropylene separator.The immobilized polysulfides on the NSC@Co3S4 surface are further reduced/oxidized during the discharge/charge process via the efficient bi-functional catalytic effect of NSC@Co3S4,resulting in the rapid conversion of LiPSs.Consequently,the integrated sulfur cathode delivers a high initial reversible capacity of 1,473.6 mAh·g^-1 at 0.2 C and a high specific capacity of 979 mAh·g^-1 at 1 C after 500 cycles as well as excellent cycling stability for 1,000 cycles with a high specific capacity of 362.5 mAh·g^-1 at 5 C,which are superior to reported similar host materials. 关键词：bi-fufictional catalysis POLYSULFIDES redox reaction chemical adsorption lithium-sulfur BATTERIES

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An integrated cathode with bi-functional catalytic effect for excellent-performance lithium-sulfur batteries

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