摘要
以魔芋粉作为碳源、三聚氰胺作为氮源和氢氧化钾作为活化剂制备具有氮掺杂的多孔碳基材;利用热熔法将硫负载在该多孔碳基材中,得到碳硫复合材料,并将其用作锂硫电池的正极材料。采用扫描电镜、透射电镜、比表面分析仪、X射线衍射仪、热重分析仪以及X射线光电子能谱仪对材料的形貌、结构以及化学成分进行分析检测。实验结果表明:魔芋的凝胶化转变可原位固定三聚氰胺,从而实现氮元素在碳基材中的均匀分布,掺氮量高达6.22%,且所得碳基材具有丰富的微孔/介孔结构,比表面积为998m2/g。掺氮介孔碳/硫复合材料用于锂硫电池的正极材料时,表现出优异的电化学性能,在0.5C与1.0C的倍率下,循环200圈后的比容量分别为532mAh/g与490mAh/g,是一种理想的锂硫电池正极材料。
In this study, a nitrogen doped mesoporous carbon material was prepared by using natural konjac as carbon source, melamine as nitrogen source and KOH as active agent. Then sulfur was loaded into the mesoporous carbon matrix via a melting diffusion method to obtain C/S composite, and it was used as the anode material of lithium sulfur batteries. The morphology, microstructures and the chemical composition were characterized by using scanning electron microscopy, transmission electron microscopy, specific surface area analyzers, X ray diffractometer, thermogravimetric analysis and X ray photoelectron spectroscopy. The experiment results show that nitrogen element is distributed evenly in the carbon matrix through fixing melaminein situ by gelatinization of konjac, with 6.22% nitrogen content. The obtained carbon matrix with hierarchical microporous/mesoporous structure has the specific surface area of 998 m2/g. When the sulfur/carbon composite is used as cathode material of lithium sulfur batteries, it exhibits excellent electrochemical performance, with the capacity of 532 mAh/g at 0.5 C and 490 mAh/g at 1.0 C even after 200 cycles. Therefore, it is an ideal anode material for lithium sulfur batteries.
作者
蔡周阳
李玉姣
林山
蔡玉荣
CAI Zhouyang;LI Yujiao;LIN Shan;CAI Yurong(College of Materials and Textiles,ZhejiangSci-TechUniversity,Hangzhou 310018,China)
出处
《浙江理工大学学报（自然科学版）》
2018年第5期551-559,共9页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
浙江省自然科学基金项目(LY16E020013)
关键词
介孔碳
氮掺杂
魔芋
锂硫电池
mesoporous structure
nitrogen-doped
konjac
lithium sulfur battery
