水热法制备纳米SnO_(2)电极材料及其储锂性能

Hydrothermal preparation of nano-SnO_(2) electrode materials and their lithium storage properties

以SnCl_(2)·2H_(2)O、聚乙二醇400(PEG400)和Na_(3)C_(6)H_(5)O_(7)·2H_(2)O为主要原料,采用简单的水热法制备了SnO_(2)负极材料.采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)表征其组成和微观形貌,并采用恒流充放电测试、循环伏安法(CV)对样品进行电化学性能测试.结果表明:添加PEG400可以有效改善SnO_(2)表面形貌,减少其团聚现象并且使其电化学性能明显提高.当添加量为10 mL时,合成的SnO_(2)具有良好的循环及倍率性能,首次放电比容量为2774 mAh/g,循环50次后放电比容量为600 mAh/g,电化学性能较改性前的SnO_(2)有了明显改善.

SnO_(2)anode material was prepared by a simple hydrothermal method using SnCl_(2)·2H_(2)O,polyethylene glycol 400(PEG400)and Na_(3)C_(6)H_(5)O_(7)·2H_(2)O as the main raw materials.The composition and microscopic morphology of the prepared negative materials were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The electrochemical properties were also tested using galvanostatic charge/discharge(DC)and cyclic voltammetry(CV)methods.The results showed that the addition of PEG400 can effectively improve the surface morphology of SnO_(2),reduce its agglomeration phenomenon and significantly improve the electrochemical properties.When the addition content was 10 mL,the synthesized SnO_(2)has good cycling and multiplicative performance with a first discharge capacity of 2774 mAh/g and the discharge capacity of 600 mAh/g after 50 cycles,which was significantly higher than that of SnO_(2)electrode materials before the modification.