Cathode Interfacial Layer Formation via in Situ Electrochemically Charging in Aqueous Zinc-Ion Battery

The issue of material dissolution is common in aqueous batteries, leading to serious performance deterioration. However, it is difficult to be solved so far. In this study, a single component cathode solid electrolyte interface (SEI) layer (CaSO4·2H2O) is observed via in situ electrochemically charging process, as demonstrated in a Ca2MnO4 cathode for an aqueous zinc-ion battery. Density functional theory calculation confirms its electronic...