Developing an in Situ Polyoxovanadate to Vanadium Nitride/Carbon Conversion Strategies in Manufacture Aqueous Zinc Ion Batteries Cathode with Ultrahigh Rate Capability

Abstract Vanadium nitride (VN) is considered to have sufficient application potential for energy storage, and in the field of aqueous zinc‐ion batteries (AZIBs), its unique in situ phase transition mechanism is conducive to solving the intrinsic low conductivity, slow kinetics, and poor cycling stability of vanadium‐based materials. In the present study, the nanoscale morphology of VN cathode materials is controlled by cationic modulation of decavanadate precursors. Among them, VN quantum dots/nitrogen‐doped carbon nanosheets (VNQD/NC), which have the prime particle size and uniform distribution on a carbon substrate, show excellent cathode performance after activation. The innovative VNQD/NC composite exhibits high discharge capacity (698 mAh g −1 at 0.5 A g −1 ), excellent rate performance (498 mAh g −1 at 20 A g −1 ), and excellent stability. The mechanism of the VNQD/NC cathode is investigated by various ex situ means, and researchers actively analyze the source of its excellent electrochemical performance. This work offers an alternative strategy for the preparation of nitride materials and provides insights into the development of high‐performance vanadium‐based cathodes for AZIBs.