Abstract:Lithium-ion batteries have high working voltage and high energy density. At present, mainstream cathode materials such as LiFePO4 cannot meet the need due to its low theoretical capacity. V2O5 has a layered structure and can be effectively embedded with lithium. It is a new type of positive electrode for lithium-ion batteries. However, the poor cycle stability of V2O5 as a cathode material for lithium-ion batteries limits its application. V2O5 nanomaterials with two-dimensional structure were prepared by hydrothermal method and used as cathode materials for lithium-ion batteries, and compared with commercial V2O5. The results of a series of electrochemical tests show that lamellar structure of V2O5 is nanosheets with particle size of 130—280 nm; V2O5 nano sheet has three obvious redox peaks, which shows the process of three phase state transition of lithium ion embedded in V2O5 nano sheet. The cyclic stability test results show that after 50 cycles, reversible capacity of V2O5 nano sheet can still reach 227 mAh/g. Compared with discharge capacity of the second cycle, capacity retention rate is 89%, which proves that V2O5 nano chip has better lithium storage performance.