title: Graphene-wrapped sulfur particles as a rechargeable lithium-sulfur battery cathode material with high capacity and cycling stability.
abstract: 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 ∼600 mAh/g over more than 100 cycles, representing a promising cathode material for rechargeable lithium batteries with high energy density.
authors.affiliation: Department of Chemistry, Stanford University, Stanford, California 94305, United States.
authors.forename: Hailiang
authors.initials: H
authors.lastname: Wang
authors.forename: Yuan
authors.initials: Y
authors.lastname: Yang
authors.forename: Yongye
authors.initials: Y
authors.lastname: Liang
authors.forename: Joshua Tucker
authors.initials: JT
authors.lastname: Robinson
authors.forename: Yanguang
authors.initials: Y
authors.lastname: Li
authors.forename: Ariel
authors.initials: A
authors.lastname: Jackson
authors.forename: Yi
authors.initials: Y
authors.lastname: Cui
authors.forename: Hongjie
authors.initials: H
authors.lastname: Dai
mesh_terms: D011211:Electric Power Supplies; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D008422:Materials Testing; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry; D013455:Sulfur / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D011092:Polyethylene Glycols; D013455:Sulfur; D006108:Graphite; D008094:Lithium