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    Trapping sulfur in hierarchically porous, hollow indented carbon spheres: A high-performance cathode for lithium-sulfur batteries

    Access Status
    Fulltext not available
    Authors
    Zhong, Y.
    Wang, S.
    Sha, Y.
    Liu, M.
    Cai, R.
    Li, L.
    Shao, Zongping
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhong, Y. and Wang, S. and Sha, Y. and Liu, M. and Cai, R. and Li, L. and Shao, Z. 2016. Trapping sulfur in hierarchically porous, hollow indented carbon spheres: A high-performance cathode for lithium-sulfur batteries. Journal of Materials Chemistry A. 4 (24): pp. 9526-9535.
    Source Title
    Journal of Materials Chemistry A
    DOI
    10.1039/c6ta03187k
    ISSN
    2050-7488
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/8958
    Collection
    • Curtin Research Publications
    Abstract

    Hierarchically porous hollow carbon spheres with an indented void structure have been designed as hosts for high-performance cathode materials for lithium-sulfur batteries. With a diameter of approximately 100 nm and a pore volume of 3.72 cm3 g-1, the hosts can retain sulfur within the porous structures, including the external cone-like cavities, the porous carbon shells, and the inner linings. The exquisite indented structure provides excellent electron and Li-ion pathways while the symmetrically indented voids evenly alleviate the stress induced by the volume change during cycling. The oxygen functional groups further relieve the shuttle effect of polysulfide. A composite electrode with 52% sulfur loading demonstrates a remarkable initial discharge capacity of 1478 mA h g-1 at 1/10C (1C = 1675 mA g-1), corresponding to 88% sulfur utilization. Even when the sulfur/carbon (S/C) ratio of the composite is increased threefold from 1:1 to 3:1 (75% sulfur loading), a very high capacity retention is still maintained, achieving an ultraslow rate of capacity fading, ~0.047% per cycle over 1200 cycles at 1/2C.

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