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Preparation and Electrochemical Properties of Sulfur-Carbon Composite as Cathode Materials for the Lithium-Sulfur Batteries

WU Feng1,2,WU Sheng-xian1,CHEN Ren-jie1,2,CHEN Shi1,2,WANG Guo-qing1,2(1.School of Chemical Engineering and Environment,Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology,Beijing 100081,China;2.National Development Center for High Technology Green Material,Beijing 100081,China)  
Sulfur-carbon composites as cathode for lithium-sulfur battery have been synthesized by heating a mixture of elemental sulfur and activated carbon with high specific surface area and microporous structure.The physical structure performance is characterized by X-ray diffraction,scanning electron microscopy and specific surface area measurements.It show two reduction peaks at 2.05 V and 2.35 V,one oxidation peak at 2.4 V during cyclic voltammogram test.The charge-discharge experiment indicates that its initial discharge specific capacity is 1 352.5 mA·h·g-1 at a current density of 100 mA·g-1.The utilization of electrochemically active sulfur is about 80.9%.The specific capacity still keep as high as 800.7 mA·h·g-1 after 40 cycles which show good cycle stability.
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