纳米结构V2O5薄膜的溶胶凝胶制备与特性研究

采用溶胶 -凝胶技术 ,以V2 O5粉末为原材料制备了纳米结构的V2 O5薄膜 .使用椭偏仪、X射线衍射仪(XRD)、红外分光光度计 (FTIR)、电化学分析、原子力显微镜 (AFM)等方法研究了V2 O5薄膜的特性 .实验结果表明 :薄膜具有纳米多孔结构 ;热处理使得薄膜致密 ,折射率提高 ,薄膜结晶 .红外吸收测量揭示了刚制备的薄膜中钒以 4价离子为主 ,高温热处理后形成 5价钒离子 ,相应出现了V2 O5特征吸收峰 .这种结构的薄膜具有很好的锂离子注入 /退出可逆性和很高的离子注入容量 ,可用作锂离子电池的高性能阴极材料 .

Preparation and Characteristics of Nano-structured Vanadium Pentoxide Films Derived by Sol-Gel Process

The nanostructured V 2O 5 films have been prepared by Sol Gel process with the V 2O 5 powder as the starting materials in this paper.The films were characterized by ellipsometer,XRD,FTIR,electrochemical measurements,and AFM,respectively.The experimental results have shown that the grown films have a nano porous structure,and that the films were shrunken and crystallized,and the refractive index increased as well with an increase of the annealing temperature.The FTIR measurements reveal that V 4 ions dominate in the as grown films,while V 5 ions become the domination in the films annealed at higher temperatures.The nanostructured V 2O 5 films have an excellent cycle for lithium intercalation/deintercalation,and a high lithium insertion capacity,which can be used as a high quality cathodic material for lithium battery.