采用355nm脉冲激光沉积(PLD)法以Li6.16V0.61Si0.39O5.36为靶制备了Li2O-V2O5-SiO2薄膜。由X射线衍射(XRD)、扫描电子显微镜(SEM)、表面轮廓、交流阻抗(ACI)、直流极化(DCP)等方法对薄膜的形貌、结构及电化学性能进行表征,讨论了Li2O-V2O5-SiO2薄膜电化学性能与其结构的关系。结果表明,该薄膜是一种元针孔和裂缝、厚度均匀、组成致密的非晶态结构;Li2O-V2O5-SiO2薄膜离子电导率与温度符合Arrhenius关系,离子迁移数接近1.0(tion〉99.999%),是一种性能良好的离子导体材料;Li2O-V2O5-SiO2薄膜室温时离子电导率达4.0×10^-7S/cm,而电子电导率仅为10^-11~10^-12S/cm,可作为电解质材料用于全固态薄膜锂电池。
Using Li6.16V0.61Si0.39O5.36 as target, Li2O-V2O5-SiO2 film were deposited by 355nm reactive pulsed laser deposition (PLD). The morphology, structure and electrochemical properties of Li2O-V2O5-SiO2 film were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), profile meter, AC impendence (ACI) and DC polarization (DCP) methods. The dependence of film's performances on structures was discussed. Results show that Li2O-V2O5-SiO2 film possesses a denser non-crystal structure with 4×10^-7S/cm ionic conductivity, 10^-11~10^-12S/cm electronic conductivity, ion transference number close to 1.0, uniform thickness and without any pinhole or crack on it's surface. The dependence of Li2O-V2O5-SiO2 film ionic conductivity on measured temperature is true of Arrhenius relation showing film excellent ionic conductivity and could be used as electrolyte material for all-sold-state thin film lithium battery.