Constructing dual-ionic channels to enhance the cycle stability of solid-state zinc-air batteries

Improving cycling stability is essential for the practical development of solid-state zinc-air batteries (ZABs). Constructing stable transport channels for the key ionic species is a critical starting point. Herein, a novel interpenetrating network electrolyte was designed with dual-ionic channels for both OH⁻ and zinc species. This solid-state electrolyte achieved a high ionic conductivity of 271 mS cm⁻¹, and the solid-state ZAB incorporating this novel electrolyte effectively extended charge-discharge cycle stability. It was cycled stably for 98 h at a current density of 3 mA cm⁻² and exhibited ultra-long cycling stability of 168 h at a current density of 1 mA cm⁻². It was found that the by-products on the zinc electrode were suppressed due to the efficient dual-ionic channels, which synergistically facilitate the zinc deposition through the direct pathway.