Sodium?ion batteries (SIBs) have the advantages of rich resources and low cost and supply risk.Therefore,they are regarded as a new generation of electrochemical energy storage devices with great potential.At present,vanadium pentoxide (V2O5) has gradually become a research hotspot of cathode materials for SIBs because of its high working voltage and theoretical capacity. However,the disadvantages of V2O5 cathode material,including low ion diffusion coefficient,low conductivity,and structural instability caused by repeated ion intercalation/deintercalation,have limited its application in SIBs.This paper analyzed the crystal structure and sodium storage mechanism of V2O5 and summarized the research progress of V2O5 cathode material in SIBs through modification methods such as morphology control,crystal structure modification,chemical pre?insertion,and composition with other materials.Finally,the paper prospected the development trend of V2O5 electrode material.