Synthesis of mesoporous β-Na0.33V2O5 with enhanced electrochemical performance for lithium ion batteries

Mesoporous flake-like β-Na0.33V2O5 has been successfully fabricated via a facile hydrothermal reaction with subsequent calcinations. The flake-like β-Na0.33V2O5 particles with an average thickness of about 100 nm, are composed of small nanorods, exhibiting the mesoporous structures. The electrochemical performance demonstrate that β-Na0.33V2O5 with 3D tunneled crystal structure has high specific discharge capacity, good rate capability and cyclic stability. It delivers high specific discharge capacities of 339 and 226 mA h g−1 at the current densities of 20 and 300 mA g−1, respectively. The structural stability of β-Na0.33V2O5 upon cycling has been investigated by ex-situ X-ray diffraction (XRD), which indicates the β-Na0.33V2O5 has excellent crystal structural reversibility in the voltage range of 1.5∼4 V. Considering its surprising distinct plateaus and excellent structural stability, the β-Na0.33V2O5 material is a promising cathode material for lithium ion batteries.

Graphical abstractThe mesoporous flake-like β-Na0.33V2O5 exhibits high specific discharge capacity, good rate capability and cyclic stability. Moreover, it shows excellent crystal structural stability upon cycling in the potential range of 1.5–4 V.Figure optionsDownload full-size imageDownload as PowerPoint slide