LAUSR

Due to the advantages of the low cost of Zn and the safety of aqueous electrolytes, the aqueous Zn ion battery (AZIBs) is expected to become the next generation battery after lithium-ion battery. However, the problems of Zn anode dendrite growth, self-corrosion, and passivation in AZIBs lead to the short cycle life and short circuit of the battery. In this work, uniform and stable Silk II-Silk Fibroin (Silk II-SF) coating was prepared on the surface of Zn anode by a simple method. Experiments show that the SF coating can prevent dendritic growth and hydrogen evolution corrosion. Therefore, symmetric cells using Silk II-SF@Zn anode achieved the cycle life over 3300 h and 1500 h at the current densities of 10 mA cm -2 and 20 mA cm --2 , respectively. Using Silk II-SF coating to protect Zn anode is a simple and effective strategy to realize dendrite-free Zn anode and long cycle life AZIBs.