Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 608, Issue -, Pages 220-228Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.04.073
Keywords
Lithium-sulfur batteries; Sulfur cathode; Electrospinning; Porous carbon fibers; Electrochemical performance
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Funding
- National Nature Science Foundation for Distinguished Youth Scholars of China [51025102]
- National Nature Science Foundation of China [51371158]
- Program for Innovative Research Team in University of Ministry of Education of China [IRT13037]
- Key Science and Technology Innovation Team of Zhejiang Province [2010R50013]
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Mesohollow and microporous carbon nanofibers (MhMpCFs) were prepared by a coaxial electrospinning with polyacrylonitrile (PAN) and polymethylmethacrylate (PMMA) as outer and inner spinning solutions followed by a carbonization. The carbon fibers were thermal treated with sublimed sulfur to form S/MhMpCFs composite, which was used as cathode material for lithium-sulfur batteries. Electrochemical study shows that the S/MhMpCFs cathode material provides a maximum capacity of 815 mA h/g after several cycles of activation, and the capacity retains 715 mA h/g after 70 cycles, corresponding to a retention of 88%. The electrochemical property of the S/MhMpCFs composite is much superior than the S-incorporated solid carbon fibers prepared from electrospinning of single PAN. The mechanism of the enhanced electrochemical property of the S/MhMpCFs composite is discussed. (C) 2014 Elsevier B.V. All rights reserved.
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