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.

The 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 as PowerPoint slide