The practical application of Li-S batteries is largely impeded by the"shuttle effect"generated at the cathode which results in a short life cycle of the battery.To address this issue,this work discloses a bimetallic metal-organic framework(MOF)as a sulfur host material based on Al-MOF,commonly called(Al)MIL-53.To obtain a high-adsorption capacity to lithium polysulfides(Li2Sx,4≤x≤8),we present an effective strategy to incorporate sulfiphilic metal ion(Cu2+)with high-binding energy to Li2Sx into the framework.Through a one-step hydrothermal method,Cu2+is homogeneously dispersed in Al-MOF,producing a bimetallic Al/Cu-MOF as advanced cathode material.The macroscopic Li2S4 solution permeation test indicates that the Al/Cu-MOF has better adsorption capacity to lithium polysulfides than monometallic Al-MOF.The sulfur-transfusing process is executed via a melt-diffusion method to obtain the sulfur-containing Al/Cu-MOF(Al/Cu-MOF-S).The assembled Li-S batteries with Al/Cu-MOF-S yield improved cyclic performance,much better than that of monometallic Al-MOF as sulfur host.It is shown that chemical immobilization is an effective method for polysulfide adsorption than physical confinement and the bimetallic Al/Cu-MOF,formed by incorporation of sulfiphilic Cu2+into porous MOF,will provide a novel and powerful approach for efficient sulfur host materials.

Pengbiao Geng;Meng Du;Xiaotian Guo;Huan Pang;Ziqi Tian;Pierre Braunstein;Qiang Xu

School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225009,China;Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China;Laboratoire de Chimie de Coordination,CNRS,CHIMIE,UMR 7177,Université de Strasbourg,Strasbourg Cedex 67081,France;Department of Materials Science and Engineering and SUSTech Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology(SUSTech),Xueyuan Ave,Nanshan,Shenzhen 518055,China;Institute for Integrated Cell-Material Sciences(iCeMS),Kyoto University,Kyoto 606-8501,Japan

能源与环境材料（英文）

[1]Pengbiao Geng;Meng Du;Xiaotian Guo;Huan Pang;Ziqi Tian;Pierre Braunstein;Qiang Xu-.Bimetallic Metal-Organic Framework with High-Adsorption Capacity toward Lithium Polysulfides for Lithium-sulfur Batteries)[J].能源与环境材料（英文）,2022(02):599-607

Polysulfides,Li2Sx,sulfiphilic,Cu2+is,Li2S4,transfusing,Cu2+into

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