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Title: Graphene-wrapped sulfur/metal organic framework-derived microporous carbon composite for lithium sulfur batteries
Authors: Chen, R
Zhao, T
Tian, T
Cao, S
Coxon, P.R
Xi, K
Fairen-Jimenez, D
Vasant Kumar, R
Cheetham, A.K 
Issue Date: 2014
Citation: Chen, R, Zhao, T, Tian, T, Cao, S, Coxon, P.R, Xi, K, Fairen-Jimenez, D, Vasant Kumar, R, Cheetham, A.K (2014). Graphene-wrapped sulfur/metal organic framework-derived microporous carbon composite for lithium sulfur batteries. APL Materials 2 (12) : 124109. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: A three-dimensional hierarchical sandwich-type graphene sheet-sulfur/carbon (GS-S/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 zinc-containing 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 GS-S/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. © 2014 Author(s).
Source Title: APL Materials
ISSN: 2166532X
DOI: 10.1063/1.4901751
Rights: Attribution 4.0 International
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