Facilitating sulfur species capture and bi-directional redox in Li-S batteries with single-atomic Co-O_(2)N_(2) coordination structure  

作　　者：Yunqiang Zhang Huaming Yuan Enyan Guo Shunwei Chen Manman Ren Jingyun Ma Jiaxi Cui Mei Li Laiying Jing Li Li 

机构地区：[1]School of Materials Science and Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,Shandong,China [2]Institute of Fundamental and Frontier Sciences,University of Electronic Science and Technology of China,Chengdu 610054,Sichuan,China [3]School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China

出　　处：《Journal of Energy Chemistry》2024年第12期604-614,共11页能源化学（英文版）

基　　金：supported financially by the National Natural Science Foundation of China(NSFC)(Grant No.22208174 and 52272221);the New Colleges and Universities Twenty Foundational Projects of Jinan City(2021GXRC068);the Universities Youth Innovation Team Development Plan of Shandong Province(2023KJ140);the Natural Science Foundation of Shandong Province(ZR2022MB143);the Basic Research Projects of Science,Education,Industry Integration Pilot Engineering of Qilu University of Technology(Shandong Academy of Sciences)(2023PY002)。

摘　　要：Lithium-sulfur(Li-S)batteries suffer from the shuttle effect of soluble lithium polysulfides(LiPSs)and slow redox kinetics,significantly limiting their practical application.Although single-atom catalysts(SACs)offer a promising strategy to address these challenges,designing materials with optimal adsorption force and high catalytic activity remains a grand challenge.Here,we present a cobalt(Co)-based SAC with unique Co-O_(2)N_(2) coordination structures for Li-S batteries.Both experimental and theoretical studies demonstrate that O,N-coordinated Co single atoms anchored on a porous carbon framework(Co/NOC)effectively capture LiPSs and dramatically catalyze bidirectional polysulfide conversion.The expanded carbon layer spacing facilitates lithium ions diffusion and maximizes the exposure of active sites.As a result,Li-S batteries incorporating Co/NOC as separators exhibit outstanding rate performance(906.6m Ah g^(-1)at 3 C)and exceptional cycling stability,even at-10℃.Furthermore,with a high sulfur loading of 12.0 mg cm^(-2),the areal specific capacity reaches up to 12.36 mAh cm^(-2).This work provides some useful insights for the design of high-performance SACs for Li-S batteries.

关 键 词：Asymmetrically coordinated Co-O_(2)N_(2) Zeolitic imidazolate framework-67 Melamine resin Carbon nanoflakes Shuttle effect 

分 类 号：TM912[电气工程—电力电子与电力传动] O643.36[理学—物理化学]