Abstract:
In order to improve the challenges of zinc anode such as dendrites and corrosion in aqueous zinc ion batteries, a layered bohmite (AlOOH) was prepared by the hydrothermal method as the surface coating of zinc anode to achieve uniform deposition of zinc ions to alleviate the corrosion and formation of zinc dendrites. The structure and morphology of the material were characterized by a scanning electron microscope and X-ray diffraction. The electrochemical performance of AlOOH@Zn was investigated by a galvanostatic long-cycle performance test and cyclic voltammetry. The experimental results show that boehmite has a unique mesoporous structure and zincophilic properties. As a coating of zinc anode, it can effectively inhibit the corrosion of zinc anode in electrolyte and provide abundant nano channels for zinc deposition. The AlOOH@Zn anode shows good stability and cycle life during the cycle process. The AlOOH@Zn symmetric battery shows stable polarization below 50 mV and its cycle life is four times that of the bare Zn at 0.5 mA·cm
−2. The AlOOH@Zn//NaV
3O
8·1.5H
2O full battery provides a high specific capacity of 238.4 mAh·g
−1 at 1 A·g
−1. These results indicate that boehmite coating is a promising strategy to inhibit the corrosion and dendrite of aqueous zinc-ion batteries.