Nickel single atom overcoordinated active sites to accelerate the electrochemical reaction kinetics for Li-S cathode

作     者：Juan Zhu Xinyue Wang Tian Ke Mingji Jia Biyu Jin Yuanyuan Li Qiwei Yang Lanhui Ren Yongyuan Ren Dangguo Cheng Jianguo Lu Xiang Gao Qinggang He Yang Hou Xiaoli Zhan Qinghua Zhang Juan Zhu;Xinyue Wang;Tian Ke;Mingji Jia;Biyu Jin;Yuanyuan Li;Qiwei Yang;Lanhui Ren;Yongyuan Ren;Dangguo Cheng;Jianguo Lu;Xiang Gao;Qinggang He;Yang Hou;Xiaoli Zhan;Qinghua Zhang

作者机构：School of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027ZhejiangChina Institute of Zhejiang University-QuzhouQuzhou 324000ZhejiangChina School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027ZhejiangChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2023年第78卷第3期

页      面：203-210,I0006页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：financial support from the National Natural Science Foundation of China(21878270,21878267,21922811,21978258 and 21961160742) the Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang(2019R01006) the Zhejiang Provincial Natural Science Foundation of China(LR19B060002) the Fundamental Research Funds for the Central Universities(2020XZZX002-09) the Startup Foundation for Hundred-Talent Program of Zhejiang University the Zhejiang Key Laboratory of Marine Materials and Protective Technologies(2020K10)。 

主　　题：Nickel single atom catalyst Ni-N_(4)-O sites 2D N-doped carbon Li-S batteries Shuttle effect 

摘      要：Lithium-sulfur(Li-S)batteries with high theoretical energy density are promising advanced energy storage devices.However,shuttling of dissolute lithium polysulfide(LiPSs)and sluggish conversion kinetics impede their applications.Herein,single nickel(Ni)atoms on two-dimensional(2D)nitrogen(N)-doped carbon with Ni-N_(4)-O overcoordinated structure(SANi-N_(4)-O/NC)are prepared and firstly used as a sulfur host of Li-S batteries.Due to the efficient polysulfides traps and highly LiPSs conversion effect of SANi-N_(4)-O/NC,the electrochemical performance of Li-S batteries obviously improved.The batteries can well operate even under high sulfur loading(5.8 mg cm^(-2))and lean electrolyte(6.1μL mg^(-1))condition.Meanwhile,density functional theory(DFT)calculations demonstrate that Ni single atom’s active sites decrease the energy barriers of conversion reactions from Li_(2)S_(8)to Li2S due to the strong interaction between SANi-N_(4)-O/NC and LiPSs.Thus,the kinetic conversion of LiPSs was accelerated and the shuttle effect is suppressed on SANi-N_(4)-O/NC host.This study provides a new design strategy for a 2D structure with single-atom overcoordinated active sites to facilitate the fast kinetic conversion of LiPSs for Li-S cathode.