Recent Advances in Zn-Ion Batteries

The ever-growing demands for electrical energy storage have stimulated the pursuit of alternative advanced batteries. Zn-ion batteries (ZIBs) are receiving increased attentions due to the low cost, high safety, and high eco-efficiency. However, it is still a big challenge to develop suitable cathode materials for intercalation of Zn ions. This review provides a timely access for researchers to the recent activities regarding ZIBs. First, cathode materials including various manganese oxides, vanadium compounds, and Prussian blue analogs are summarized with details in crystal structures and Zn ion storage mechanisms. Then, the electrolytes and their influences on the electrochemical processes are discussed. Finally, opinions on the current challenge of ZIBs and perspective to future research directions are provided.