Hydrogenated V 2 O 5 Nanosheets for Superior Lithium Storage Properties

V 2 O 5 is a promising cathode material for lithium ion batteries boasting a large energy density due to its high capacity as well as abundant source and low cost. However, the poor chemical diffusion of Li + , low conductivity, and poor cycling stability limit its practical application. Herein, oxygen‐deficient V 2 O 5 nanosheets prepared by hydrogenation at 200 °C with superior lithium storage properties are described. The hydrogenated V 2 O 5 (H‐V 2 O 5 ) nanosheets deliver an initial discharge capacity as high as 259 mAh g −1 and it remains 55% when the current density is increased 20 times from 0.1 to 2 A g −1 . The H‐V 2 O 5 electrode has excellent cycling stability with only 0.05% capacity decay per cycle after stabilization. The effects of oxygen defects mainly at bridging O(II) sites on Li + diffusion and overall electrochemical lithium storage performance are revealed. The results reveal here a simple and effective strategy to improve the capacity, rate capability, and cycling stability of V 2 O 5 materials which have large potential in energy storage and conversion applications.