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

Wang, Bei, Wen, Yanfen, Ye, Delai, Yu, Hua, Sun, Bing, Wang, Guoxiu, Hulicova-Jurcakova, Denisa and Wang, Lianzhou (2014) Dual protection of sulfur by carbon nanospheres and graphene sheets for lithium-sulfur batteries. Chemistry - A European Journal, 20 18: 5224-5230. doi:10.1002/chem.201400385


Author Wang, Bei
Wen, Yanfen
Ye, Delai
Yu, Hua
Sun, Bing
Wang, Guoxiu
Hulicova-Jurcakova, Denisa
Wang, Lianzhou
Title Dual protection of sulfur by carbon nanospheres and graphene sheets for lithium-sulfur batteries
Journal name Chemistry - A European Journal   Check publisher's open access policy
ISSN 0947-6539
1521-3765
Publication date 2014-04-25
Year available 2014
Sub-type Article (original research)
DOI 10.1002/chem.201400385
Open Access Status
Volume 20
Issue 18
Start page 5224
End page 5230
Total pages 7
Place of publication Weinheim, Germany
Publisher Wiley-VCH Verlag
Language eng
Subject 1600 Chemistry
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.
Keyword Carbon nanospheres
Graphene
High capacity
Lithium sulfur batteries
Sulfur
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2015 Collection
 
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