Nanophase-Separated Block Copolymer Layers Enabling Stable Zinc Metal Batteries

Aqueous Zn-ion batteries are promising and efficient energy storage systems owing to their low cost, high safety, and satisfactory capacity. However, the instability of Zn metal anodes, caused by dendritic growth and parasitic side reactions, hinders their practical application. In this study, a nanophase-separated block copolymer layer that enhances the reversibility of Zn metal anodes is introduced. This layer consists of two components: a high-performance engineering-plastic-based hydrophobic block exhibiting excellent mechanical properties and chemical stability, and a hydrophilic block that significantly improves the interfacial stability of the anode by selectively permeating Zn ions through the separated nanophase channels. Through an improved electrochemical system and scalable fabrication process, this block copolymer provides a feasible approach for the practical application of Zn metal anodes in aqueous energy storage systems.