水热法制备纳米SnO2电极材料及其储锂性能

以SnCl₂·2H₂O、聚乙二醇400(PEG400)和Na₃C₆H₅O₇·2H₂O为主要原料,采用简单的水热法制备了SnO₂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SnO₂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SnO₂具有良好的循环及倍率性能,首次放电比容量为2 774 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SnO₂有了明显改善.

Hydrothermal preparation of nano-SnO2 electrode materials and their lithium storage properties

SnO₂ anode material was prepared by a simple hydrothermal method using SnCl₂·2H₂O, polyethylene glycol 400 (PEG400) and Na₃C₆H₅O₇·2H₂O 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). Theelectrochemical 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 SnO₂, reduce its agglomeration phenomenon and significantly improve the electrochemical properties. When the addition content was 10 mL, the synthesized SnO₂ has good cycling and multiplicative performance with a first discharge capacity of 2 774 mAh/g andthe discharge capacity of 600 mAh/g after 50 cycles, which was significantly higher than that of SnO₂ electrode materialsbefore the modification.