Chen, RenjieZhao, TengTian, TianCao, ShuaiCoxon, PaulXi, KaiFairen-Jimenez, DavidKumar, RamachandranCheetham, AnthonyOrganic Synthesis (ORSY)Molecular Spectroscopy (MolSpec)2019-04-262019-04-2616/12/14https://dspace7-entities.atmire.com/handle/atmire/446A three-dimensional hierarchical sandwich-type graphene sheet-sulfur/carbon (GSS/CZIF8-D) composite for use in a cathode for a lithium sulfur (Li-S) battery has been prepared by an ultrasonic method. The microporous carbon host was prepared by a one-step pyrolysis of Zeolitic Imidazolate Framework-8 (ZIF-8), a typical zinccontaining metal organic framework (MOF), which offers a tunable porous structure into which electro-active sulfur can be diffused. The thin graphene sheet, wrapped around the sulfur/zeolitic imidazolate framework-8 derived carbon (S/CZIF8-D) composite, has excellent electrical conductivity and mechanical flexibility, thus facilitating rapid electron transport and accommodating the changes in volume of the sulfur electrode. Compared with the S/CZIF8-D sample, Li-S batteries with the GSS/CZIF8-D composite cathode showed enhanced capacity, improved electrochemical stability, and relatively high columbic efficiency by taking advantage of the synergistic effects of the microporous carbon from ZIF-8 and a highly interconnected graphene network. Our results demonstrate that a porous MOF-derived scaffold with a wrapped graphene conductive network structure is a potentially efficient design for a battery electrode that can meet the challenge arising from low conductivity and volume change