纳米SnO_2的制备及电化学性质

Preparation and Electrochemical Properties of Nano-SnO_2

以无机盐为前体,采用溶胶-凝胶法制备了纳米SnO2粉体.用TG-DTA,XRD,SEM等对SnO2粉末进行了表征.结果表明,采用该法经500 ℃热处理得到的SnO2超细粉具有良好的四方结构,粒径分布均匀,平均粒径在92 nm左右.将该法制得的SnO2超细粉作为锂离子电池负极材料,可逆容量高达687 mAh·g-1,而且嵌脱锂电压低（0.2～0.5 V）,是一种很有潜力的锂离子电池负极材料.

Nano-SnO2 was prepared by using inorganic salt as precursor materials through sol-gel method and characterized by thermogravimetric analysis and differential thermal analysis（TG-DTA）,X-ray diffraction（XRD） and scanning electron microscope（ SEM）. Results indicate that well-crystallized nano-SnO2 about 92 nm can be obtained by annealing at 500℃ for 3 h. The electrochemical properties of nano-SnO2 as anode material for lithium ion batteries were studied. It is shown that nano-SnO2 would be an potential anode material for lithium ion batteries with high reversible capacity （more than 687 mAh-g^-1） and low voltage plateau（0.2 -0.5 V） for Li^＋ intercalation and deintercalation.