Highly reversible aqueous Zn battery based VS4 microcrystal cathode

At present, lithium-ion batteries are widely used in many aspects in mankind society, but considering the cost and safety factors, aqueous multivalent ion batteries are much suitable for large-scale applications. Among them, aqueous zinc ion batteries (AZIBs) possess the advantages of high safety, environmental friendliness and large theoretical capacity. In this work, we prepare VS 4 nanosheets as cathode electrodes for zinc-ion batteries. The assembled batteries achieve an excellent discharge capacity and rate performance in 3 M Zn (CF 3 SO 3 ) 2 electrolyte. It presents a reversible capacity of 225.43 mAh g −1 at 0.5 A g −1 . In addition, it still can maintain a capacity retention rate of 81% after 700 cycles at 5 A g −1 .