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以锡酸钠为原料,聚乙烯吡咯烷酮(PVP)为表面活性剂,采用水热法制备松球状SnO_2纳米棒负极材料。利用扫描电子显微镜(SEM)、X射线衍射(XRD)、比表面积仪(BET)及电化学测试仪测试材料的形貌、结构、比表面积和电化学性质。结果表明,制备的SnO_2纳米晶体形貌呈松球状且尺寸均匀,分散性良好,为典型的四方系金红石相结构,比表面积为110.3m2/g,且为Ⅳ型的介孔结构。在0.01~2.5V,以200mA/g进行充放电,材料的首次放电容量为1659.3mAh/g,经过50次循环后,放电容量保持313.9mAh/g,表现出较好的循环稳定性能。
Using sodium stannate as raw material and polyvinylpyrrolidone (PVP) as surfactant, a loose spherical SnO_2 nanorods anode material was prepared by hydrothermal method. The morphology, structure, specific surface area and electrochemical properties of the material were tested by scanning electron microscopy (SEM), X-ray diffraction (XRD), surface area measurement (BET) and electrochemical measurements. The results show that the morphology of the prepared SnO 2 nanocrystals is loose spherical, uniform in size and good in dispersibility, and is a typical tetragonal rutile phase with a specific surface area of 110.3 m 2 / g and a type IV mesoporous structure. At 0.01 ~ 2.5V, charging and discharging at 200mA / g, the first discharge capacity of the material is 1659.3mAh / g. After 50 cycles, the discharge capacity remains at 313.9mAh / g, which shows good cycling stability.