Effects of Vanadium Pentoxide with Different Crystallinity on Lithium Ion Storage Performance
To investigate the effects of different crystallinity on the electrochemical performance of V2O5 as anode materials for lithium ion battery, spherical V2O5 with variable crystallinity are prepared through a solvothermal method and changing the calcination temperature. It is confirmed that V2O5 with lower crystallinity shows the better performance of lithium ion storage, because of the loose structure, lower polarization, and convenient diffusion of lithium ion. The reversible specific capacity of V2O5 obtained at 250℃ (1092.1 mAh·g-1) with lower crystallinity is much higher than that of others prepared at 350℃ (645.9 mAh·g-1), 450℃ (526 mAh·g-1), and 550℃ (498.9 mAh·g-1) at 100 mA·g-1 after 200 cycles. And it keeps 584.6 mAh·g-1 even at 1 A·g-1 after 500 cycles. V2O5 prepared at 350℃ releases an excellent rate performance with a specific capacity of 131.1 mAh·g-1 at a current density of 5 A·g-1. The idea of this work proposes an effective direction and strategy to design traditional metal oxides electrode materials with lower crystallinity to enhance the cycle and rate performance of lithium ion battery in the future.