Sulfur infiltrated mesoporous graphene–silica composite as a polysulfide retaining cathode material for lithium–sulfur batteries

The lithium–sulfur (Li–S) system is an attractive candidate to replace the current state-of-the-art lithium-ion battery due to the promising theoretical charge capacity of 1675mAh/g and energy density of 2500Wh/kg; however, the dissolution of intermediate polysulfides into the organic liquid electro...

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Bibliographic Details
Published in:Carbon (New York) 2014-04, Vol.69, p.543-551
Main Authors: Kim, Kyoung Hwan, Jun, Young-Si, Gerbec, Jeffrey A., See, Kimberly A., Stucky, Galen D., Jung, Hee-Tae
Format: Article
Language:English
Subjects:
Applied sciences
Carbon
Chemistry
Colloidal state and disperse state
Cross-disciplinary physics: materials science
rheology
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Electronics
Energy density
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
General and physical chemistry
Graphene
Lithium sulfur batteries
Materials science
Physics
Polysulfides
Porous materials
Silicon dioxide
Specific materials
Sulfur
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Summary:The lithium–sulfur (Li–S) system is an attractive candidate to replace the current state-of-the-art lithium-ion battery due to the promising theoretical charge capacity of 1675mAh/g and energy density of 2500Wh/kg; however, the dissolution of intermediate polysulfides into the organic liquid electrolyte during cycling hinders its practical realization. We report the synthesis of mesoporous graphene–silica composite (m-GS) as a supporting material of sulfur for Li–S batteries. The ordered porous silica structure was synthesized parallel to functionalized graphene sheets (FGSs) through the ternary cooperative assembly of the graphene, silica, and block copolymer precursors. The well-defined, unique mesoporous structure integrates the electronic conductivity of graphene and the dual functions of silica as a structure building block and in situ polysulfide ab-/ad-sorbing agent to give a Li–S battery that has both good retention ability of polysulfides and good rate capability.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2013.12.065