一维纳米结构SnO2的制备及其电化学性能研究

用SnCl4·5H2O、水合肼为原料，采用水热法制备一维纳米结构SnO2。X射线衍射（XRD）、扫描电镜（SEM）和透射电镜（TEM）结果表明：制备的一维纳米结构的SnO2为四方相结构，其直径为0．5—2．5μm，长度约几百微米。恒电流充放电测试结果显示：在电流密度为160mAhg^-1（0．2C）时，该SnO2材料的首次放电容量为1780mAhg^-1，第二十周期放电容量保持到468mAhg^-1；从第三周期开始，库仑效率均保持在90％以上。以上结果表明这种材料具有较高的储锂容量和较好的可逆性能，是一种有前景的锂离子电池负极材料。

Preparation and Electrochemical Properties of One-diamension SnO_2 as an Anode Material for Lithium-ion Batteries

SnO2 was prepared with SnCl4·5H2O and hydrazinium hydroxide as precursors by a hydrothermal chemical reaction. Through investigations on X -ray diffraction （XRD）, scanning electron microscopy（SEM） and transmission eleclron microscopy （TEM）, it indicated that the products were SnO2 with tetragonal structure, the diameter was 0. 5-2. 5μm and length was hundreds of micro - meter. The electrochemical properties of the one - diamension SnO2 were investigated by galvanostatic cycling. The discharge capacity in the 1st cycle was 1780 mAh g-1 at a current density of 160 mAhg-/1 （0. 2 C） and the discharge capacity at the 20st cycle was 468 mAh g^-1, and the coulombic efficiency were above 90% from the 3rd cycle, which indicated that this material had a higher high- lithium storage capacity and excellent reversibility. Additionally, the easy of preparation and cheap price also made this method very promising in lithium - ion batteries.