Abstract
Lithium/sulfur (Li/S) batteries are one of the rechargeable batteries with high theoretical special capacity and high theoretical energy density. The gaseous-phase, silica (GPSiO2)-coated sulfur composites with different weight ratios were synthesized through solid-state fusion method as a novel cathode material for Li/S batteries. X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and electrochemical testing methods were conducted to investigate the effect of gaseous-phase silica/sulfur composites on electrochemical performance. Results indicate that the composites have flocculent structure. The initial specific capacity of the GPSiO2/S-3:7 composite is up to 1610 mA h g−1 at 0.1 C, which is the highest in the different ratio composites and is approximately 96% of sulfur utilization. The specific capacity was maintained at 814 mA h g−1 after the 50th cycle. The GPSiO2/S-3:7 composite has the lowest impedance.
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Acknowledgements
The authors are grateful to the National Natural Science Foundation of China (Grant No. 11364011) and the Guangxi Natural Science Foundation (Grant No. 2015GXNSFAA139004).
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Hou, Y., Xiao, J., Guo, Y. et al. Gaseous-phase, silica-coated sulfur particles as a cathode material for high-performance lithium/sulfur batteries. J Mater Sci: Mater Electron 28, 8901–8907 (2017). https://doi.org/10.1007/s10854-017-6620-4
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DOI: https://doi.org/10.1007/s10854-017-6620-4