常温制备硫碳均匀复合材料  

Preparation of uniform composite materials of sulfur and carbon at room temperature

作　　者：杨学兵[1] 王传新[1] 

机构地区：[1]武汉工程大学湖北省等离子体化学与新材料重点实验室,湖北武汉430073

出　　处：《电池工业》2011年第4期227-229,234,共4页Chinese Battery Industry

基　　金：湖北省自然科学基金资助项目(2007ABA006)

摘　　要：采用沉淀法制备硫溶胶,通过活性炭吸附溶胶中纳米尺度的硫颗粒,在常温下制得硫碳均匀复合材料,并将该复合材料用于锂硫电池正极。通过SEM和XRD对该复合材料进行表面形貌和内部结构表征,采用恒流充放电法和电化学阻抗测量法测试正极的电化学性能。测试结果表明,活性炭吸附的硫颗粒直径在50 nm附近,且硫在活性炭中均匀分散。在电流密度为0.2 mA/cm2时,含该复合材料正极的首次放电比容量为793 mAh/g。循环充放电50次后,正极放电比容量为460 mAh/g。Sulfur sol was prepared by the method of precipitation.Then the nano-sized sulfur was adsorbed by active carbon.Composite of sulfur and carbon was therefore synthesized and was used as cathode materials of lithium-sulfur battery.Surface morphology and internal structure were characterized by SEM and XRD.Electrochemical performance of cathode was tested by methods of galvanostatic discharge and measurement of electrochemical impedance.Results showed that the diameter of sulfur particles adsorbed by active carbon was about 50 nm.And sulfur was evenly dispersed.When current density was 0.2 mA/cm2,initial specific capacity of cathode containing the composite was 793 mAh/g and the fiftieth specific capacity was 460 mAh/g.

关 键 词：硫溶胶 活性炭 锂硫电池 正极材料 

分 类 号：TM912.9[电气工程—电力电子与电力传动]