Artificial Presetting Layers for Practical Li-Metal Batteries

Li-metal batteries (LMBs) are one of the most promising candidates for next-generation practical rechargeable batteries. The in situ solid electrolyte interphase (SEI) is critical in determining the cycling stability of the LMB. However, the formation of dendritic and uncontrolled interfacial corrosion often lead to the degradation of the in situ SEI. The surface modification of Li anodes displays considerable potential for use in addressing these challenges. The artificial presetting layers (APLs) attract attention because of their capacities to regulate the evolution of the in situ SEI during cycling. This Review focuses on the functionalities and dynamic evolution of in situ SEIs and analyzes the mechanisms of the interactions between APLs, electrolytes, and in situ SEIs. The latest advancements in APLs are summarized to gain deeper insight into the influences of the structures of electrode interfaces on cycling stability. Finally, perspectives regarding the future research directions for APLs on Li-metal anodes are provided.