Unlocking dendrite-free zinc metal anodes through anti-corrosive and Zn-ion-regulating interlayer

Aqueous zinc-ion batteries (AZIBs) are a promising solution for large-scale energy storage due to their safety and cost-effectiveness. However, challenges like zinc dendrite growth and electrolyte corrosion hinder their practical use. Surface engineering methods have shown potential in stabilizing the zinc metal anode interface. In this study, we propose a successful approach by combining 2D g-C3N4 nanosheets with 3D ZIF8 nanoparticles to form a g-C3N4@ZIF8 artificial interface. The 3D ZIF8 support on the 2D g-C3N4 enables precise regulation of Zn2+ flux and efficient charge transfer, leading to improved electrochemical performance. Density functional theory confirms ZIF8's superior adsorption energy compared to g-C3N4. Strategically anchoring 3D ZIF8 nanoparticles within 2D g-C3N4 allows robust 3D diffusion of Zn2+, preventing dendrite formation and enabling dendrite-free Zn deposition. This structural design can enhance the performance of symmetric cells with an ultralong cycling lifespan of up to 6200 h at 0.25 mA cm−2/0.25 mA h cm−2 and superior rate capability, even at 40 mA cm−2. When combined with a V2O5 nanopaper cathode, our assembled AZIBs exhibit stable long-term performance. This research paves the way for more efficient and reliable AZIBs for large-scale energy storage.