Weaving 3D highly conductive hierarchically interconnected nanoporous web by threading MOF crystals onto multi walled carbon nanotubes for high performance Li-Se battery

查看全文 作　　者：Chao [1,2]Li;Yingying [1,2]Wang;Hongyan [1,2]Li;Jing [3]Liu;Jianping [3]Song;Luca [2]Fusaro;Zhi-Yi [3]Hu;Yanxin [1,2]Chen;Yu [3]Li;Bao-Lian [1,2,3]Su

机构地区：[1]Laboratory of Inorganic Materials Chemistry(CMI),University of Namur,B-5000 Namur,Belgium;[2]Namur Institute of Structured Matter(NISM),University of Namur,61 Rue de Bruxelles,B-5000 Namur,Belgium;[3]Laboratory of Living Materials at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,122 Luoshi Road,430070 Wuhan,PR China

出　　处：《Journal of Energy Chemistry》索引2021年第30卷第8期,共10页

基　　金：supported by the National Postdoctoral Program(2020M672782);National Natural Science Foundation of China(No.U1663225);Changjiang Scholars and Innovative Research Team in University(No.IRT15R52);National 111 project from the Ministry of Science and Technology;the Ministry of Education of China and the National Key R&D Program of China(No.2016YFA0202602)。 摘　　要：Lithium-selenium(Li-Se)battery has attracted growing attention.Nevertheless,its practical application is still impeded by the shuttle effect of the formed polyselenides.Herein,we report in-situ hydrothermal weaving the three-dimensional(3 D)highly conductive hierarchically interconnected nanoporous web by threading microporous metal organic framework MIL-68(Al)crystals onto multi-walled carbon nanotubes(MWCNTs).Such 3 D hierarchically nanoporous web(3 D MIL-68(Al)@MWCNTs web)with a very high surface area,a large amount of micropores,electrical conductivity and elasticity strongly traps the soluble polyselenides during the electrochemical reaction and significantly facilitates lithium ion diffusion and electron transportation.Molecular dynamic calculation confirmed the strong affinity of MIL-68(Al)for the adsorption of polyselenides,quite suitable for Li-Se battery.Their hexahedral channels(1.56 nm)are more efficient for the confinement of polyselenides and for the diffusion of electrolytes compared to their smaller triangular channels(0.63 nm).All these excellent characteristics of 3 D MIL-68(Al)@MWCNTs web with suitable confinement of a large amount of selenium and the conductive linkage between MIL-68(Al)host by MWCNTs result in a high capacity of 453 m Ah/g at 0.2 C with 99.5%coulombic efficiency after 200 cycles with significantly improved cycle stability and rate performance.The 3 D MIL-68(Al)@MWCNTs web presents a good performance in Li-Se battery in term of the specific capacity and cycling stability and also in terms of rate performance compared with all the metal-organic framework(MOF)based or MOF derived porous carbons used in Li-Se battery. 关键词：Lithium selenium battery Selenium confinement 3D hierarchically nanoporous web Metal-organic framework(MOF) Multi walled carbon nanotubes

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Weaving 3D highly conductive hierarchically interconnected nanoporous web by threading MOF crystals onto multi walled carbon nanotubes for high performance Li-Se battery

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