Journal
NANO LETTERS
Volume 11, Issue 7, Pages 2644-2647Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl200658a
Keywords
Graphene-sulfur composite; rechargeable Li-S battery; high cycling stability; energy storage
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Funding
- ONR
- Intel
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering through the SLAC National Accelerator Laboratory [DE-AC02-76SF0051]
- Stanford Graduate Fellowship
- National Defense Science and Engineering Graduate Fellowship
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We report the synthesis of a graphene-sulfur composite material by wrapping poly(ethylene glycol) (PEG) coated submicrometer sulfur particles with mildly oxidized graphene oxide sheets decorated by carbon black nanoparticles. The PEG and graphene coating layers are important to accommodating volume expansion of the coated sulfur particles during discharge, trapping soluble polysulfide intermediates, and rendering the sulfur particles electrically conducting. The resulting graphene sulfur composite showed high and stable specific capacities up to similar to 600 mAh/g over more than 100 cycles, representing a promising cathode material for rechargeable lithium batteries with high energy density.
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