Dendrites‐Free Lithium Metal Anode Enabled by Synergistic Surface Structural Engineering

Abstract Lithium (Li) metal with high specific capacity and low redox potential is widely considered as a potential anode for lithium‐ion batteries (LIBs) with high energy density. However, the catastrophic dendrites growth, “dead Li” formation, and surface passivation hinder its practical application. Herein, a selective artificial solid electrolyte interphase (SEI) layer (Li 2 S x , x = 1, 2) protection strategy is adopted, where the tip sites passivation and the uniform Li nucleation in grooves are well combined, which enables reversible Li stripping/plating with high storage capacity and robust electrode framework. The grooves derived patterned array Li with selective Li 2 S x artificial SEI (LS@A‐Li) exhibit over 1800 h cycling life at 1.0 mA cm –2 /1.0 mAh cm –2 and over 600 h even under 5.0 mA cm –2 /10.0 mAh cm –2 . The application feasibility of such LS@A‐Li is also confirmed by coupling with commercial LiFePO 4 and LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) in the full batteries. This work paves way for the large‐scale application of Li metal anode in lithium‐metal batteries with a facile and efficient fabrication process.