碳结构对锂硫电池性能的影响  

Influence of carbon structure on the property of Li-S battery

作　　者：唐琼[1,2] 李合琴[2] 张静[1,2] 周矗[2] 乔恺 徐倩[2] 

机构地区：[1]合肥工业大学电子科学与应用物理学院,安徽合肥230009 [2]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2013年第11期1335-1338,1403,共5页Journal of Hefei University of Technology：Natural Science

基　　金：安徽省自然科学基金资助项目(090414182);安徽省高校自然科学研究资助项目(KJ2009A091;KJ2012A228);中央高校基本科研业务费专项资金资助项目(4115100010)

摘　　要：单质硫分别与乙炔黑、导电石墨KS6和碳纳米管复合成不同的锂硫电池正极材料。文章用TEM观察3种碳材料的形貌,XRD检测单质硫与碳材料的结构,用交流阻抗谱、循环伏安和电池充放电测试材料的电化学性能。结果表明:碳纳米管与硫组成的复合材料在0.1C的放电倍率下能达到首次放电1 286mA·h/g,当放电倍率为0.2C,20次循环后,库仑效率可以保持在80%以上,明显优于其他2种材料的电化学性能。Cathodes of lithium-sulfur batteries were synthesized by heating element sulfur with acety-lene black, KS6 and carbon nanotubes respectively. The morphologies and structures of carbon mate-rials were determined by TEM and XRD. The structures of the composites were characterized by XRD. The electrochemical properties were characterized by electrochemical impedance spectroscopy and cyclic voltammetry under constant current charge and discharge. The results show that the com-posite of carbon nanotubes and sulfur exhibits better properties than the others, and its initial dis-charge capacity is up to 1 286 mA · h/g at a current rate of 0. 1 c and the coulombic efficiency is 80% after 20 cycles at a current rate of 0. 2 C.

关 键 词：锂硫电池 单质硫 乙炔黑 KS6 碳纳米管 库仑效率 

分 类 号：TQ152[化学工程—电化学工业]