SnO2纳米球的制备、结构及电化学性能研究

Synthesis, Structure and Electrochemical Performance of SnO2 Nanospheres

摘要:

以Na2SnO3.4H2O为原料，CO(NH2)2为表面活性剂，采用水热法制备了SnO2纳米球。利用X射线衍射（XRD)、扫描电子显微镜（SEM)、比表面积测试仪（BET）及电化学测试仪等研究材料的结构、形貌、比表面积及电化学性能。结果表明，制备的SnO2材料具有较好的球体形貌，颗粒分散均匀，形状规准，半径约为400 nm，结构呈典型的金红石相。在电压范围为0.01~3 V, 200 mA/g的电流密度下进行充放电测试，首次放电比容量为2206.6 mAh/g，50次循环后，放电比容量保持在440 mAh/g，具有较好的循环性能。

Abstract:

SnO2 nanospheres were synthesized by hydrothermal method with Na2SnO3.4H2O as raw material and CO(NH2)2 as surfactant. The crystal structure, surface morphology and specific surface area were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Brunner-Emmet-Teller（BET）. Electrochemical performance was analyzed by electrochemical measurement. The results showed that the particle uniform dispersion and emidiameter size was about 400 nm and the Structure is typical of rutile phase. As an active material for lithium-ion batteries,the SnO2 nanospheres material’s first discharge capacity of 2206.6 mAh/g at a current density of 200 mA/g and at 0.01~3.0 V. The specific discharge capacity decreased to 440 mAh/g after 50 cycles. Data from this study indicated that SnO2 nanospheres material with high capacity and superior cycling stability.