Constructing stable V₂O₅/V₆O₁₃ heterostructure interface with fast Zn²⁺ diffusion kinetics for ultralong lifespan...

Given their plentiful reserves, impressive safety features, and economical pricing, aqueous zinc - ion batteries (ZIBs) have positioned themselves as strong competitors to lithium - ion batteries. Yet, the scarcity of available cathode materials poses a challenge to their continued development. In this study, a V₂O₅/V₆O₁₃ heterostructure has been synthesized using a one - pot hydrothermal approach and employed as the cathode material for ZIBs. As evidenced by both experimental and theoretical findings, V₂O₅/V₆O₁₃ heterostructure delivers a rapid electrons and ions diffusion kinetics promoted by the stable interface and strong electronic coupling with significant charge transfer between V₂O₅ and V₆O₁₃, as well as a stable interface achieved by adjusting V - O bond length. Consequently, the optimized V₂O₅/V₆O₁₃ heterostructure cathode of ZIBs demonstrates exceptional capacity (338 mAh g^-1 at 0.1 A g^-1), remarkable cycling stability (92.96 % retained after 1400 cycles at 1 A g^-1). Through comprehensive theoretical calculations and ex situ characterization, the kinetic analysis and storage mechanism of Zn²⁺ are thoroughly investigated, providing a solid theoretical foundation for the advancement of novel V - based cathode materials aimed at enhancing the performance of ZIBs.