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Single-atomic tungsten-doped Co_(3)O_(4) nanosheets for enhanced electrochemical kinetics in lithium–sulfur batteries

查看全文 作　　者：Sangni [1,2]Wang;Riming [3]Hu;Ding [4,5]Yuan;Lei [5]Zhang;Chao [5]Wu;Tianyi [6]Ma;Wei [7]Yan;Rui [1]Wang;Liang [1]Liu;Xuchuan [3]Jiang;Hua Kun [4,5]Liu;Shi Xue [4,5]Dou;Yuhai [2,4]Dou;Jiantie [1]Xu 高影响力作者 机构地区：[1]National Engineering Laboratory for VOCs Pollution Control Technology and Equipment,Guangdong Provincial Key Laboratory of Atmospheric Environment,Pollution Control School of Environment and Energy,South China University of Technology,Guangzhou,China;[2]Shandong Institute of Advanced Technology,Jinan,China;[3]School of Materials Science and Engineering,Institute for Smart Materials&Engineering,University of Jinan,Jinan,China;[4]Institute of Energy Materials Science,University of Shanghai for Science and Technology,Shanghai,China;[5]Institute for Superconducting and Electronic Materials,University of Wollongong,Wollongong,Australia;[6]School of Science,RMIT University,Melbourne,Victoria,Australia;[7]State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai,China高影响力机构 出　　处：《Carbon Energy》索引2023年第5卷第8期,共11页高影响力期刊 基　　金：Shandong Excellent Young Scientists Fund Program(Oversea),Grant/Award Number:2022S02002;Jinan“5150”Talent Program,Grant/Award Number:2022C01001;Pearl River Talent Recruitment Program,Grant/Award Number:2019QN01L096;Guangdong Innovative and Entrepreneurial Research Team Program,Grant/Award Number:2019ZT08L075。 摘　　要：The practical application of lithium–sulfur batteries(LSBs)is severely hindered by the undesirable shuttling of lithium polysulfides(LiPSs)and sluggish redox kinetics of sulfur species.Herein,a series of ultrathin singleatomic tungsten-doped Co_(3)O_(4)(Wx-Co_(3)O_(4))nanosheets as catalytic additives in the sulfur cathode for LSBs are rationally designed and synthesized.Benefiting from the enhanced catalytic activity and optimized electronic structure by W doping,the Wx-Co_(3)O_(4) not only reduces the shuttling of LiPSs but also decreases the energy barrier of sulfur redox reactions of sulfur species,leading to accelerated electrode kinetic.As a result,LSB cathodes with the use of 5.0 wt%W0.02-Co_(3)O_(4) as the electrocatalyst show the high reversible capacities of 1217.0 and 558.6 mAh g^(-1) at 0.2 and 5.0 C,respectively,and maintain a high reversible capacity of 644.6 mAh g^(-1) at 1.0 C(1.0 C=1675 mA g^(-1))after 500 cycles.With a high sulfur loading of 5.5 mg cm^(-2) and electrolyte–electrode ratio of 8μL_(electrolyte) mg_(sulfur)^(-1),the 5.0 wt%W_(0.02)-Co_(3)O_(4)-based sulfur cathode also retains a high reversible areal capacity of 3.86 mAh cm^(-2) at 0.1 C after 50 cycles with an initial capacity retention of 84.7%. 关 键 词：catalytic additives lithium-sulfur batteries single-atomic dopant sluggish redox kinetics
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