Electrolyte Strategies toward Better Zinc-Ion Batteries

With the increasing demand for large-scale energy storage, high-safety and low-cost rechargeable zinc-ion batteries (ZIBs) have been regarded as potential substitutes for lithium-ion batteries (LIBs). Exploring high-performance cathodes and a stable zinc anode is important, and fruitful achievements have been made. However, many fundamental issues still hinder the development of zinc-based energy storage systems. As a pivotal component, the electrolyte provides the basic operating environment to ensure the high compatibility and reversible cycling of each component in the battery. In this Focus Review, we present a comprehensive overview of electrolyte strategies in terms of solving or alleviating the issues of cathode dissolution, zinc dendrites and corrosion, hydrogen evolution, and so on. Furthermore, the adoption of gel electrolytes in flexible batteries is briefly introduced. Finally, the recommended future research perspectives of electrolytes are discussed, which may boost the development of this field.