Constructing VN-V₂O₃ Heterogeneous Interface to Improve Wide Temperature Zinc Storage Performance

Vanadium-based cathode materials deliver high specific capacity and multivalent property for zinc storage, but face challenges including dissolution, capacity decay, and slow ion transport at low temperatures, hindering their widespread application. Herein, a porous vanadium nitride-vanadium oxide (VN-V₂O₃) heterostructure is fabricated by a facile solvothermal and pyrolysis method, which enables the construction of the built-in electric field at the VN-V₂O₃ heterointerface and provides multi-channel active sites. During electrochemical activation, V₂O₃ in the VN-V₂O₃ heterojunction undergoes an insertion reaction, while crystal structure of VN alters with the amorphous transformation, thereby promoting Zn²⁺ storage and diffusion. The VN-V₂O₃ electrode exhibits a high reversible capacity of 335 mAh g^-1 and ultra-long cycling capability up to 6000 cycles at 10 A g^-1. It is noteworthy that the VN-V₂O₃ cathode demonstrates excellent zinc storage performance with Zn(CF₃SO₃)₂-based gel electrolyte over wide temperature range (-35 to 60 °C). This work provides a new reference for the construction of vanadium-based heterostructures, constituting a feasible strategy for achieving long cycle stability and wide temperature range adaptability in cathode materials for aqueous ZIBs application.