Abstract: Mn_xV₂O₅ (x=0~0.06) was prepared by hydrothermal method with H₂O₂ and V₂O₅ as precursors and Mn²⁺ added directly in the sol preparation process. Structures and morphologies of the materials were characterized by X-ray diffraction (XRD), X-ray Photoelectron Spectroscope (XPS) and scanning electron microscope (SEM). The results indicate that the V₂O₅ is well crystallized as an orthorhombic structure without any detectable impurity phase with the doping of Mn²⁺. The doping Mn²⁺ is situated between anionic sheets of VO₆ chain in the V₂O₅ and the morphology of V₂O₅ changes from nanorods to nanobelts cluster. The electrochemical behavior of the Mn_xV₂O₅ acted as cathode materials is studied by charge-discharge test and electrochemical impedance spectra (EIS) test through a three electrode system. The results indicate that the efficiency of the first charge-discharge of the material enhances to 90% with the Mn²⁺ doping. The discharge capacity of the Mn_0.01V₂O₅ is up to 192.2 mAh/g after 90 charge-discharge cycles at 0.2C rate. The doping Mn²⁺ performs efficiently in ionic conductivity of V₂O₅ electrode material, and the ionic conductivity of Mn_0.02V₂O₅ is enhanced from 6.27×10^-4 S/cm to 1.58×10^-3 S/cm.

Key words: Mn_xV₂O₅, electrode material, ion doping, electrochemical properties