Electric double layer design for Zn-based batteries

Zinc-based batteries (ZBs) have recently attracted wide attention energy storage with cost-effectiveness and intrinsic safety. However, it suffers from poor interface stability between the zinc anode and the electrolyte. Although the structure of the electrical double layer (EDL) is the key factor governing the interfacial properties, its understanding is still in infancy due to limited characterization techniques. In this review, we systematically discuss the relationship between interface properties, solvation sheath structure and the components of the Helmholtz layer. The possible transport pathway of zinc ions and the structural evolution mechanism of EDL at the interface are emphasized, with a scientific principle for the EDL regulation to inspire the rational design of future electrolytes and interface.