硫/有序介孔碳复合材料的制备及其电化学性能

Preparation and Electrochemical Properties of Sulfur/Ordered Mesoporous Carbon Composite

用模板法合成有序介孔碳材料(ordered mesoporous carbon,OMC),以该材料作为硫的载体,用低温熔融的方法制备了硫/有序介孔碳(S/OMC)复合材料。通过透射电子显微镜、比表面分析和X射线粉末衍射仪对材料进行表征。结果表明:OMC孔道有序,比表面积高达1600m^2/g,硫在OMC内分散性良好。对S/OMC又进行了恒流充放电、循环伏安和交流阻抗等电化学性能测试,显示S/OMC电化学可逆性较好,首次放电容量达1430mA·h/g,60次循环时仍稳定在500mA·h/g。OMC内部有序的孔道和较大的表面微孔对电池性能的提高起到了重要的作用。

An ordered mesoporous carbon（OMC） material was synthesized via a template synthesis method.The composites of S/OMC with OMC as a matrix of sulfur were prepared by means of low temperature melting.The composites were investigated by transmission electron microscopy,Brunauer-Emmett-Teller method and X-ray powder diffraction.The results show that the channels of OMC is in an order,and the specific surface area of OMC is1 600m^2/g.The sulfur could be efficiently dispersed in OMC.The composites of S/OMC were determined by galvanostatic charge/discharge,cyclic voltammograms and electrochemical impedance spectroscopy.It is indicated that the S/OMC has preferable electrochemical reversible,and the first discharge capacity reaches 1 430 mAh/g and stabilizes at 500mA·h/g after 60 cycles.It is essential for the improvement of the battery performance to possess the massive micropores with the greater surface area existed in the OMC.