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Conductive metal-organic frameworks promoting polysulfides transformation in lithium-sulfur batteries

查看全文 作　　者：Shuai [1]Wang;Fanyang [1]Huang;Zhengfeng [2]Zhang;Wenbin [1]Cai;Yulin [1]Jie;Shiyang [1]Wang;Pengfei [2]Yan;Shuhong [1]Jiao;Ruiguo [1]Cao 高影响力作者 机构地区：[1]Hefei National Laboratory for Physical Science at the Microscale,Department of Material Science and Engineering,University of Science and Technology of China,Hefei 230026,Anhui,China;[2]Beijing Key Laboratory of Microstructure and Properties of Solids,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China高影响力机构 出　　处：《Journal of Energy Chemistry》索引2021年第30卷第12期,共9页高影响力期刊 基　　金：supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0402802,2017YFA0206700);the National Natural Science Foundation of China (Grant Nos. 21776265, 51902304, and 52072358);the Natural Science Foundation of Anhui Province (Grant No.1908085ME122);the Fundamental Research Funds for the Central Universities (Grant No. Wk2060140026);the Hefei National Laboratory for Physical Sciences at the Microscale (Grant No.KF2020106)。 摘　　要：Metal organic frameworks(MOFs) have been extensively investigated in Li-S batteries owing to high surface area, adjustable structures and abundant catalytic sites. Nevertheless, the insulating nature of traditional MOFs render retarded kinetics of polysulfides conversion, leading to insufficient utilization of sulfur. In comparison, conductive MOFs(c-MOFs) show great potential for promoting polysulfides transformation due to superb electronic conductivity. In this work, a nickel-catecholates based c-MOF, NiHHTP(HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene), is designed to regulate surface chemistry of self-supported carbon paper for advanced Li-S batteries. Taking advantage of the porous structure and high conductivity, the as-prepared Ni-HHTP is conducive to synergising strengthening the chemisorption of polysulfides and accelerating the reaction kinetics in Li-S batteries, significantly mitigating the polysulfides diffusion from the non-encapsulated sulfur cathode, therefore promoting polysulfides transformation in Li-S batteries. This work points out a promising modification strategy for developing advanced sulfur cathode in Li-S batteries. 关 键 词：Li-S batteries Conductive metal-organic framework Surface modification Ni-HHTP
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