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Promoting polysulfide conversions via cobalt single-atom catalyst for fast and durable lithium-sulfur batteries

查看全文 作　　者：Ziwei [1]Wang;Yuwen [1]Cheng;Shanying [1]Wang;Jie [1]Xu;Bo [1]Peng;Dan [2]Luo;Lianbo [1,3]Ma 高影响力作者 机构地区：[1]Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials&School of Materials Science and Engineering,Anhui University of Technology,Maanshan 243002,China;[2]School of Information and Optoelectronic Science and Engineering,South China Normal University,Guangzhou 510006,China;[3]Department of Mechanical and Aerospace Engineering,The Hong Kong University of Science and Technology(HKUST),Clear Water Bay,Hong Kong 999077,China高影响力机构 出　　处：《Nano Research》索引2023年第16卷第7期,共9页高影响力期刊 基　　金：This project was financially supported by the National Natural Science Foundation of China(No.22005003);the Natural Science Research Project of Anhui Province Education Department(Nos.2022AH030046 and 2022AH050334);the Yong Scientific Foundation of Anhui University of Technology for Top Talent(No.DT2100000947);the Scientific Research Foundation of Anhui University of Technology for Talent Introduction(No.DT19100069);The theoretical simulations were carried out at Shanxi Supercomputing Center of China,and performed on TianHe-2. 摘　　要：Although promising strategies have been developed to resolve the critical drawbacks of lithium-sulfur(Li-S)batteries,the intractable issues including undesirable shuttling of polysulfides and sluggish redox reaction kinetics have still been unresolved thoroughly.Herein,a cobalt single-atom(CoSA)catalyst comprising of atomic Co distributed homogeneously within nitrogen(N)-doped porous carbon(Co-NPC)nanosphere is constructed and utilized as a separator coating in Li-S batteries.The Co-NPC exposes abundant active sites participating in sulfur redox reactions,and remarkable catalytic activity boosting the rapid polysulfide conversions.As a result,Li-S batteries with Co-NPC coating layer realize significantly enhanced specific capacity(1295 mAh·g^(-1)at 0.2 C),rate capability(753 mAh·g^(-1)at 3.0 C),and long-life cyclic stability(601 mAh·g^(-1)after 500 cycles at 1.0 C).Increasing the areal sulfur loading to 6.2 mg·cm^(-2),an extremely high areal capacity of 7.92 mAh·cm^(-2)is achieved.Further in situ X-ray diffraction,density functional theory calculations,and secondary ion mass spectrometry confirm the high catalytic capability of CoSA towards reversible polysulfide conversion.This study supplies new insights for adopting single-atom catalyst to upgrade the electrochemical performance of Li-S batteries. 关 键 词：lithium-sulfur batteries polysulfide shuttling sluggish redox kinetics cobalt single-atom catalyst catalytic capability
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