Preparation of Li_(3+x)V_(1-x)Si_xO_4 Films by Solvthermal Electrochemical Method

Dense crystalline Li3VO4/Li4SiO4 solid solution films were prepared on Pt substrate electrochemically in SiO2,V2O5,LiOH,absolute ethyl alcohol solution.XRD,IR,and Raman analyses indicate that the films are well-crystallized with γ-Li3PO4 structure.No Li2SiO3 impurity is found in the sample.The chemical composition of the film is 0.4(Li4SiO4)-0.6(Li3VO4).Using a low boiling point ethyl alcohol as solvent can improve the films properties due to the increased vapor pressure generated in the reaction.The absolute ethyl alcohol of the reaction system facilitated the formation of the Li3+xV1-xSixO4 phase.The surface of the films is smooth and fine grained due to the low solubility of the constituent ions in the solvent and the low formation speed of the films.