Graphene-wrapped sulfur/metal organic framework-derived microporous carbon composite for lithium sulfur batteries

No Thumbnail Available
Chen, Renjie
Zhao, Teng
Tian, Tian
Cao, Shuai
Xi, Kai
Kumar, Ramachandran
Cheetham, Anthony
Journal Title
Journal ISSN
Volume Title
American Institute of Physics Publishing
Research Projects
Research Project
Organizational Units
Organizational Unit
Organizational Unit
Journal Issue
A 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