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Selenium sulfide/double-layered hollow carbon sphere (SeS2/DLHC) composites have been designed as high-performance cathode materials for novel Li–SeS2 batteries. In the constructed composite, SeS2 is predominantly encapsulated in the interlayer space of DLHCs with a high loading of 75% (weight percentage) and serves as the active component for lithium storage. The presence of Se in the composite and the carbon framework not only alleviate the shuttling of polysulfide, but also improve the conductivity of electrodes. Migration of active materials from the interlayer void to the hollow cavity of DLHCs after cycling, which further mitigates the loss of active materials and the shuttle effect, is observed. As a result, the SeS2/DLHC composite delivers a high specific capacity (930 mA·h·g-1 at 0.2 C) and outstanding rate capability (400 mA·h·g-1 at 6 C), which is much better than those of SeS2/single-layered hollow carbon sphere, Se/DLHC, and S/DLHC composites. Notably, the SeS2/DLHC composite shows an ultralong cycle life with 89% capacity retention over 900 cycles at 1 C, or only 0.012% capacity decay per cycle. Our study reveals that both SeS2 and the double-layered structures are responsible for the excellent electrochemical performance.

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Publication history

Received: 29 June 2016
Revised: 30 July 2016
Accepted: 31 July 2016
Published: 07 September 2016
Issue date: December 2016

Copyright

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016

Acknowledgements

Acknowledgements

The authors acknowledge the financial support from the Australian Research Council, the Queensland Government, the CAS/SAFEA International Partnership Program for Creative Research Teams, the Australian National Fabrication Facility and the Australian Microscopy and Microanalysis Research Facility at the Centre for Microscopy and Microanalysis, The University of Queensland. L. Z. acknowledges the financial support from the National Natural Science Foundation of China (No. 51502226).

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Email: nanores@tup.tsinghua.edu.cn

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