Constructing stable VO/VO heterostructure interface with fast Zn diffusion kinetics for ultralong lifespan zinc-ion batteries.

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 VO/VO 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, VO/VO heterostructure delivers a rapid electrons and ions diffusion kinetics promoted by the stable interface and strong electronic coupling with significant charge transfer between VO and VO, as well as a stable interface achieved by adjusting V - O bond length. Consequently, the optimized VO/VO heterostructure cathode of ZIBs demonstrates exceptional capacity (338 mAh g at 0.1 A g), remarkable cycling stability (92.96 % retained after 1400 cycles at 1 A g). Through comprehensive theoretical calculations and ex situ characterization, the kinetic analysis and storage mechanism of Zn are thoroughly investigated, providing a solid theoretical foundation for the advancement of novel V - based cathode materials aimed at enhancing the performance of ZIBs.