Solution‐engineering of Vanadyl Ethylene Glycolate for Promoting Cathodic Kinetics in High‐Performance Zinc‐Ion Batteries

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Abstract Developing high‐performance aqueous zinc‐ion batteries (AZIBs) requires precise control over electrode structure and composition. However, conventional synthesis methods often suffer from structural inconsistencies and long processing time, hindering practical application. Here, we present a new method with a one‐step solution engineering strategy to synthesize ZnCl 2 ‐doped amorphous vanadyl ethylene glycolate (ZnCl 2 @A‐VEG), effectively modulating its porous architecture and enhancing cathodic kinetics. ZnCl 2 acts as a microporosity modulator, increasing the electrochemical surface area and promoting rapid Zn 2+ transport. As a result, ZnCl 2 @A‐VEG exhibits a fast Zn 2+ diffusion coefficient of 4.67 × 10 −9 cm 2 s −1 (74 times higher than crystalline VEG) and a low activation energy of 16.15 kJ mol −1 . Ex situ and in situ analyses and DFT calculation reveal a synergistic H⁺/Zn 2+ co‐insertion and stable amorphous framework with phase evolution during cycling. This work provides a scalable and efficient approach for designing high‐performance cathodes for next‐generation AZIBs.

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