Citation: LI Yan-Bing, DUAN Xiao-Bo, HAN Ya-Miao, ZHU Ding, HUANG Li-Wu, CHEN Yun-Gui. Sulfur-Hydrothermal Carbon Composites for Cathode in High-Rate Lithium-Sulfur Batteries[J]. Chinese Journal of Inorganic Chemistry, ;2015, (4): 641-648. doi: 10.11862/CJIC.2015.073
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Sulfur-carbon composites as the cathode of Lithium-Sulfur batteries have shown excellent electrochemical performance for high power devices. To enhance rate performance of sulfur cathode for Li-S batteries, a carbon material consisted of non-uniform carbon spheres has been prepared by hydrothermal method. Sulfur disperses evenly on the surface of the carbon spheres via a melt-diffusion method. The as-prepared composite with a sulfur content of 52wt% delivers an initial discharge capacity of 1 174 mAh·g-1 and a reversible discharge capacity of 788 mAh·g-1 after 100 cycles at 0.2C. At a higher rate of 4C, the capacity stabilizes at around 600 mAh·g-1. During cycling, the coulombic efficiency is maintained above 90%. The results show that the carbon-sulfur composites with chain conductive network represents a promising cathode material for rechargeable lithium batteries because of the effective improvement of the electronic conductivity, the restraint of the volume expansion and the reduction of the shuttle effect.
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