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以纤维素为碳源,采用水热法制备了碳微球,通过添加金属Sn,制得SnO2/C复合材料。通过扫描电子显微镜(SEM)、红外光谱仪(FT-IR)及X-射线衍射仪(XRD)对其形貌及结构进行表征,采用循环伏安法(CV)及电化学阻抗(EIS)测试对材料的电化学性能进行表征。结果表明:制得的SnO2/C复合材料表面存在羟基、羰基等多种含氧基团,同时复合材料中存在Sn-O键,锡在复合材料中以SnO2的形式存在;当碳化温度为280℃、反应时间为8h时,SnO2/C复合材料呈球状,粒径分布在4~6μm之间;与水热碳化后的产物对比,SnO2/C复合材料作为电极材料具有更优良的循环性能和电容特性,电子传递能力也有显著提高。
Using cellulose as carbon source, carbon microspheres were prepared by hydrothermal method and SnO2 / C composite was prepared by adding metal Sn. The morphology and structure were characterized by scanning electron microscopy (SEM), infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) The electrochemical properties of materials were characterized. The results show that there are many oxygen-containing groups such as hydroxyl group and carbonyl group on the surface of SnO2 / C composites. At the same time, there are Sn-O bonds in SnO2 / C composites. Tin is SnO2 in the composites. When the carbonization temperature is 280 ℃, the reaction time is 8h, the SnO2 / C composites are spherical and the particle size distribution is between 4 ~ 6μm. Compared with the products after hydrothermal carbonization, SnO2 / C composites have better cycling performance and Capacitance characteristics, electron transfer capacity has also significantly improved.