Cathodes for Aqueous Zn-Ion Batteries: Materials, Mechanisms and Kinetics.

As the increasing of the concerns about the safety of lithium ions batteries (LIBs), aqueous zinc-ion batteries (ZIBs) with a lower cost, higher safety, and higher co-efficiency have attracted more and more interests. However, finding suitable cathode materials is still an urgent problem in ZIBs. In recent years, a lot of significant works are reported, including manganese-based cathodes, vanadium-based cathodes, Prussian blue analog-based materials, and sustainable quinone cathodes. In this review, some typical cathode materials are introduced. We also summarized the detailed storage mechanisms and the improving methods for the reaction kinetics of zinc-ion. Finally, the issues, challenges, and the research directions are provided.