Dual protection of sulfur by carbon nanospheres and graphene sheets for lithium-sulfur batteries

Wang, B; Wen, Y; Ye, D; Yu, H; Sun, B; Wang, G; Hulicova-Jurcakova, D; Wang, L

Dual protection of sulfur by carbon nanospheres and graphene sheets for lithium-sulfur batteries

Wang, B Wen, Y Ye, D Yu, H Sun, B

Wang, G

Hulicova-Jurcakova, D Wang, L

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Publication Type:: Journal Article
Citation:: Chemistry - A European Journal, 2014, 20 (18), pp. 5224 - 5230
Issue Date:: 2014-04-25

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Field	Value	Language
dc.contributor.author	Wang, B	en_US
dc.contributor.author	Wen, Y	en_US
dc.contributor.author	Ye, D	en_US
dc.contributor.author	Yu, H	en_US
dc.contributor.author	Sun, B https://orcid.org/0000-0002-4365-486X	en_US
dc.contributor.author	Wang, G https://orcid.org/0000-0003-4295-8578	en_US
dc.contributor.author	Hulicova-Jurcakova, D	en_US
dc.contributor.author	Wang, L	en_US
dc.date.issued	2014-04-25	en_US
dc.identifier.citation	Chemistry - A European Journal, 2014, 20 (18), pp. 5224 - 5230	en_US
dc.identifier.issn	0947-6539	en_US
dc.identifier.uri	http://hdl.handle.net/10453/41025
dc.description.abstract	Well-confined elemental sulfur was implanted into a stacked block of carbon nanospheres and graphene sheets through a simple solution process to create a new type of composite cathode material for lithium-sulfur batteries. Transmission electron microscopy and elemental mapping analysis confirm that the as-prepared composite material consists of graphene-wrapped carbon nanospheres with sulfur uniformly distributed in between, where the carbon nanospheres act as the sulfur carriers. With this structural design, the graphene contributes to direct coverage of sulfur to inhibit the mobility of polysulfides, whereas the carbon nanospheres undertake the role of carrying the sulfur into the carbon network. This composite achieves a high loading of sulfur (64.2 wt %) and gives a stable electrochemical performance with a maximum discharge capacity of 1394 mAh g-1 at a current rate of 0.1 C as well as excellent rate capability at 1 C and 2 C. The improved electrochemical properties of this composite material are attributed to the dual functions of the carbon components, which effectively restrain the sulfur inside the carbon nano-network for use in lithium-sulfur rechargeable batteries. Sulfur sandwich: A new type of sandwiched carbon network, consisting of graphene-wrapped carbon nanospheres coated with sulfur (82.7 wt % sulfur) were designed as a cathode material for lithium-sulfur rechargeable batteries (see scheme, CS=carbon sphere, GO=graphene oxide). The composite material exhibits a high specific discharge capacity of 1394 mAh g-1 at 0.1 C, excellent cycling stability for 100 cycles, and high rate performance at 1 C and 2 C. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.	en_US
dc.relation.ispartof	Chemistry - A European Journal	en_US
dc.relation.isbasedon	10.1002/chem.201400385	en_US
dc.subject.classification	General Chemistry	en_US
dc.title	Dual protection of sulfur by carbon nanospheres and graphene sheets for lithium-sulfur batteries	en_US
dc.type	Journal Article
utslib.citation.volume	18	en_US
utslib.citation.volume	20	en_US
utslib.for	0303 Macromolecular and Materials Chemistry	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	03 Chemical Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
utslib.copyright.status	closed_access
pubs.issue	18	en_US
pubs.publication-status	Published	en_US
pubs.volume	20	en_US

Abstract:

Well-confined elemental sulfur was implanted into a stacked block of carbon nanospheres and graphene sheets through a simple solution process to create a new type of composite cathode material for lithium-sulfur batteries. Transmission electron microscopy and elemental mapping analysis confirm that the as-prepared composite material consists of graphene-wrapped carbon nanospheres with sulfur uniformly distributed in between, where the carbon nanospheres act as the sulfur carriers. With this structural design, the graphene contributes to direct coverage of sulfur to inhibit the mobility of polysulfides, whereas the carbon nanospheres undertake the role of carrying the sulfur into the carbon network. This composite achieves a high loading of sulfur (64.2 wt %) and gives a stable electrochemical performance with a maximum discharge capacity of 1394 mAh g-1 at a current rate of 0.1 C as well as excellent rate capability at 1 C and 2 C. The improved electrochemical properties of this composite material are attributed to the dual functions of the carbon components, which effectively restrain the sulfur inside the carbon nano-network for use in lithium-sulfur rechargeable batteries. Sulfur sandwich: A new type of sandwiched carbon network, consisting of graphene-wrapped carbon nanospheres coated with sulfur (82.7 wt % sulfur) were designed as a cathode material for lithium-sulfur rechargeable batteries (see scheme, CS=carbon sphere, GO=graphene oxide). The composite material exhibits a high specific discharge capacity of 1394 mAh g-1 at 0.1 C, excellent cycling stability for 100 cycles, and high rate performance at 1 C and 2 C. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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http://hdl.handle.net/10453/41025