期刊
CHEMSUSCHEM
卷 7, 期 2, 页码 563-569出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201300742
关键词
electrochemistry; graphene; nanostructures; rechargeable Li-S batteries; sulfur composite
资金
- National Natural Science Foundation of China [51272156, 21333007, 21273146]
- SJTU-UM joint research project
Composite materials of porous pyrolyzed polyacrylonitrile-sulfur@graphene nanosheet (pPAN-S@GNS) are fabricated through a bottom-up strategy. Microspherical particles are formed by spray drying of a mixed aqueous colloid of PAN nanoparticles and graphene nanosheets, followed by a simple heat treatment with elemental sulfur. The pPAN-S primary nanoparticles are wrapped homogeneously and loosely within a three-dimensional network of graphene nanosheets (GNS). The hierarchical pPAN-S@GNS composite shows a high reversible capacity of 1449.3 mAhg(sulfur)(-1) or 681.2 mAhg(composite)(-1) in the second cycle; after 300 cycles at a 0.2 C charge/discharge rate the capacity retention is 88.8% of its initial reversible value. Additionally, the coulombic efficiency (CE) during cycling is near 100 %, apart from in the first cycle, in which CE is 81.1 %. A remarkable capacity of near 700 mAhg(sulfur)(-1) is obtained, even at a high discharge rate of 10 C. The superior performance of pPAN-S@GNS is ascribed to the spherical secondary GNS structure that creates an electronically conductive 3D framework and also reinforces structural stability.
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