锂硫二次电池正极复合材料的合成和性能研究

Study on synthesis and electrochemical property of lithium-sulfur secondary battery

采用单质硫与活性炭在一定条件下合成了一种新型含硫复合材料。通过XRD、BET比表面积分析和孔径分布测试手段对复合材料进行了表征,利用循环伏安和电池充放电对材料的电化学性能进行了测试。结果表明:此复合材料表现出了较好的电化学性能,其初始放电比容量达650mAh/g,在室温下经过40次循环之后电池放电比容量仍稳定在480mAh/g。

A carbon-sulfur composite of the lithium-sulfur secondary battery was synthesized by heating element sulfur and active carbon. The composites were characterized by X-ray diffraction and Brunauer-Emmett-Teller. The measurements such as cyclic voltammetry,constant current charge and discharge were performed with the composites. The results show that the composites exhibite a good electrochemical property with the initial cycle specific capacity up to 650 mAh/g and a stable reversible capacity approximately 480 mAh/g after 40 cycle numbers.