松针状碳纳米管/碳纤维复合碳材料的制备及其在锂硫电池中的应用  

Preparation and Application of Pine Needle Carbon Nanotubes/Carbon Fiber Composites for Lithium Sulfur Battery

作　　者：孟卫娟 李瑜[1] 张鼎 张忠林[1] 段东红[1] 陈良 郝晓刚[1] 刘世斌[1] MENG Weijuan, LI Yu, ZHANG Ding, ZHANG Zhonglin, DUAN Donghong, CHEN Liang, HAO Xiaogang, LIU Shibin(Institute of Clean Technique for Chemical Engineering, Taiyuan University of Technology, Taiyaan 030024, Chin)

机构地区：[1]太原理工大学洁净化工研究所,太原030024

出　　处：《太原理工大学学报》2018年第3期391-398,共8页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(20676088)

摘　　要：采用热催化化学气相沉积法,在催化剂前驱体预处理的碳纸碳纤维上沉积碳纳米管。沉积的碳纳米管为多壁碳纳米管,石墨化程度高、分布密度高、比表面积大、管径均匀,微观形貌为松针状。以所制备的CNTs/CF复合材料作为三维多孔电子导体制成锂硫电池,S/CNTs/CF电池首次放电比容量达到1 213.6mAh/g,硫的利用率为72.45%,循环55次后比容量保持在798.4mAh/g,比活性炭电池的电化学性能有显著提高,表明S/CNTs/CF复合材料可以有效地提升锂硫电池的循环性能。Carbon nanotubes（CNTs）were grown by chemical vapor deposition on carbon paper/carbon fiber pretreated by catalyst precursor.The characterization results show that the prepared carbon nanotubes were multi-walled carbon nanotubes,the microstructure was pine needle carbon nanotubes/carbon fiber（CNTs/CF）,which had structures of multi-walled,highly-distributed,diameter-uniformed nanotubes possessing high surface area and graphitization giving a good performance.The cathode consisting of the S/CNTs/CF composites was utilized for button cells.The results show that the initial discharge specific capacity of an elemental sulfur positive electrode with S/CNTs/CF was 1213.6 mAh/g and the utilization of electrochemically active sulfur was 72.45% .The specific capacity remained as high as 798.4 mAh/g after 55 cycles.Compared with activated carbon cells,S/CNTs/CF cells were improved significantly in electrochemical performance,showing that the S/CNTs/CF composites can improve the cycle stability effectively.

关 键 词：化学气相沉积法 碳纳米管/碳纤维复合碳材料 锂硫电池 硫正极 电化学性能 

分 类 号：TQ150.1[化学工程—电化学工业]