Abstract
Lithium–sulfur battery has been considered as a promising electrochemical energy storage system based on its theoretical energy density. However, its practical application is hindered by poor conductivity of sulfur and the shuttle effect. Herein, a hierarchical three-dimensional nitrogen and phosphorous codoped graphene and carbon nanotubes with 70 wt% of sulfur content (N, P codoped G/CNTs-S70) composite was prepared using melamine phosphate as a single precursor of N and P. The simultaneous introduction of N and P creates high active sites on the G/CNTs backbones, restricts the detachments of sulfur from the host G/CNTs, and induces strong chemical adsorption of the dissolution of lithium polysulfides. The as-prepared N, P codoped G/CNTs-S70 composite delivers a high initial discharge capacity of 1550 mA h g−1 and retains a capacity of 735 mA h g−1 after 200 cycles at 0.5 C. This is a significant improvement in the rate capability and cycling stability compared with the un-doped G/CNTs-S70 cathode. This simple strategy with single precursor offers promising electrochemical properties for Li–S batteries.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Nos. 21676304 and 21636010) and the Hunan Provincial Science and Technology Plan Project (No. 2017TP1001).
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Walle, M.D., Zhang, Z., Zhang, M. et al. Hierarchical 3D nitrogen and phosphorous codoped graphene/carbon nanotubes–sulfur composite with synergistic effect for high performance of lithium–sulfur batteries. J Mater Sci 53, 2685–2696 (2018). https://doi.org/10.1007/s10853-017-1678-1
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DOI: https://doi.org/10.1007/s10853-017-1678-1