Two-dimensional V₂O₅ sheet network as electrode for lithium-ion batteries

Two-dimensional V₂O₅ and manganese-doped V₂O₅ sheet network were synthesized by a one-step polymer-assisted chemical solution method and characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermal-gravimetric analysis, and galvanostatic discharge-charge analysis. The V₂O₅ particles were covered with thin carbon layers, which remained after decomposition of the polymer, forming a network-like sheet structure. This V₂O₅ network exhibits a high capacity of about 300 and 600 mA•h/g at a current density of 100 mA/g when it was used as a cathode and anode, respectively. After doping with 5% molar ratio of manganese, the capacity of the cathode increases from 99 to 165 mA•h/g at a current density of 1 A/g (∼3 C). This unique network structure provides an interconnected transportation pathway for lithium ions. Improvement of electrochemical performance after doping manganese could be attributed to the enhancement of electronic conductivity.