Graphene-wrapped sulfur/metal organic framework-derived microporous carbon composite for lithium sulfur batteries
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...
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| Auteurs principaux: | , , , , , , , , |
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| Autres auteurs: | |
| Langue: | anglais |
| Publié: |
American Institute of Physics Publishing
2019
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| Accès en ligne: | https://demo7.dspace.org/handle/123456789/446 |
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| Résumé: | 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 |
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