文献类型：期刊文献

中文题名：Atomically dispersed Fe-N_(5) coordination structure anchored in defective g-C_(3)N_(4) as oversaturated asymmetric single-atom catalysts for accelerating redox kinetics in Li-S batteries

作者：Jun Wang[1];Jinxin Wang[1];Yongzheng Zhang[1];Cheng Ma[2];Jitong Wang[1,3];Wenming Qiao[1];Licheng Ling[1]

机构：[1]State Key Laboratory of Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology,Shanghai,200237,China;[2]Key Laboratory of Specially Functional Polymeric Materials and Related Technology(Ministry of Education),School of Materials Science and Engineering,East China University of Science and Technology,Shanghai,200237,China;[3]Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology,School of Chemistry and Chemical Engineering,Guangxi University,Nanning,530004,China

年份：2025

卷号：209

期号：6

起止页码：230

中文期刊名：Journal of Materials Science & Technology

外文期刊名：材料科学技术(英文版)

基金：supported by the National Natural Science Foundation of China(Nos.U21A2060 and 22178116);the Natural Science Foundation of Shanghai(No.22ZR1417400);the Fundamental Research Funds for the Central Universities(Nos.222201817001,50321041918013,JKA01221601,JKD01241701).

语种：英文

中文关键词：Defective;Oversaturated asymmetric;Single-atom Fe catalyst;Sulfur conversion kinetics;Lithium-sulfur batteries

摘要：Lithium-sulfur(Li-S)batteries are regarded as the most formidable competitor to lithium-ion batteries due to their superior theoretical capacity.However,the negative impact of soluble lithium polysulfide(LiPSs)and slow redox reaction kinetics seriously hamper the commercialization of Li-S batteries.In this study,a defect-rich single-atom catalyst with an oversaturated asymmetric Fe-N_(5)coordination structure anchored in defective g-C_(3)N_(4)(C_(3)N_(4)-Fe@rGO)is designed via an absorption-pyrolysis strategy.The two-dimensional(2D)conducting C_(3)N_(4)@graphene structure with abundant defect sites accelerates the trans-fer and transportation of lithium ions and electrons.The oversaturated asymmetric Fe-N_(5)coordination structure effectively improves the adsorbility of LiPSs and accelerates the redox kinetics of sulfur species.Hence,the Li-S cell with a C_(3)N_(4)-Fe@rGO modified separator reveals a high initial capacity(1197.1 mAh g^(-1) at 0.2 C)and a low capacity decay rate(0.037%per cycle after 900 cycles at 1 C).Even at high sulfur loading and extreme temperatures of 0℃,it also shows good cycling performance.This work creates ideas for synthesizing oversaturated single-atom coordination environments and an efficient route to the practical realization of the Li-S batteries.