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以Na_2SnO_3·4H_2O为原料,CO(NH_2)_2为沉淀剂,采用水热法制备了SnO_2纳米球。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、比表面积测试仪(BET)及电化学测试仪测试材料的结构、形貌、比表面积及电化学性能。结果表明,所制备的纳米SnO_2材料具有规整的球体形貌,颗粒分散均匀,半径约为400nm,呈典型的金红石相结构。在电压为0.01~3V、电流密度200mA/g的条件下进行充放电测试,首次放电比容量为2206.6mA·h/g,50次循环后,放电比容量保持在440mA·h/g,具有较好的循环性能。
Taking Na_2SnO_3 · 4H_2O as raw material and CO (NH_2) __2 as precipitating agent, SnO_2 nanospheres were prepared by hydrothermal method. The structure, morphology, specific surface area and electrochemical properties of the material were tested by X-ray diffraction (XRD), scanning electron microscopy (SEM), BET surface area and electrochemical tester. The results show that the prepared nanosized SnO 2 material has a regular spherical morphology and the particles are uniformly distributed with a radius of about 400 nm and a typical rutile phase structure. Under the conditions of voltage of 0.01 ~ 3V and current density of 200mA / g, the initial discharge specific capacity was 2206.6mA · h / g. After 50 cycles, the specific discharge capacity was maintained at 440mA · h / g, Good cycle performance.