摘要
以改进Hummers法制备的氧化石墨烯作为载体,运用简单化学沉积并加以热处理制备硫/氧化石墨烯(H-GO/S)复合材料。采用傅里叶红外光谱仪(FT-IR)、X线衍射仪(XRD)、透射电子显微镜(TEM)、热质量分析仪(TGA)等表征手段对H-GO/S复合材料的微观结构、形貌和组成进行表征;同时运用恒流充放电和循环伏安对电极材料进行电化学性能测试。在0.1 C倍率下H-GO/S复合材料首次放电比容量达1 060 m A·h/g,20次循环之后,放电比容量趋向稳定,160次循环后放电比容量仍可达到620 m A·h/g,衰减率仅为0.068%,库伦效率始终保持在97%以上。以上结果表明H-GO/S复合材料具有优良的循环稳定性以及比较高的库伦效率。
The graphene oxide（ GO） was synthesised by promoted Hummers process. S deposed on GO through an uncomplicated chemical reaction,then heat treated the assynthesized samples to prepare HGO / S composites. The microstructure and the morphology of the composited electrode were characterized by X-ray diffraction（ XRD）,transmission electron microscope（ TEM） and thermogravimetric analysis（ TGA）. The electrochemical properties of the electrodes were investigated by galvanostatic charge-discharge and cyclic voltammetry（ CV）. The H-GO / S composited electrodes manifested a high initial capacity（ 1 060 m A·h / g,0. 1 C） and excellent capacity stability after 20 cycles.The discharge capacity could retain 620 m A·h / g even after 160 cycles,corresponding to an extremely low capacity decay rate of0. 068% per cycle.The average coulombic efficiency was above 97%. Results showed that the H-GO / S composited electrodes had excellent cyclability and high coulumbic efficiency.
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2016年第4期17-20,27,共5页
Journal of Nanjing Tech University(Natural Science Edition)
基金
江苏省自然科学基金重点资助项目(BK2011030)
江苏省教育厅重点项目(KJA430006)
江苏高校优势学科建设工程
关键词
锂硫电池
正极材料
热复合
H-GO/S复合材料
循环稳定性
lithium / sulfur batteries
cathode materials
melt-diffusion
H-GO / S composite
stable cycle performance
