Boosting Interfacial Binding Force for Highly Efficient and Stable Lithium Metal Anodes

Uncontrolled Li dendrite growth and interfacial side reactions severely limited the performance of the Li metal anode. Herein, we present a simple and effective strategy to construct a firmly adhered Ga–Sn layer on Li metal to form a Ga–Sn/Li composite anode. By harnessing the self‐healing function of Ga‐based liquid metals and strong Sn–Li interaction, the interfacial layer homogenizes Li ⁺ flux, promotes uniform Li deposition, suppresses side reactions, and accelerates Li ⁺ transport kinetics. Consequently, the Ga–Sn/Li symmetric cells achieve an extended cycle lifetime of 1200 h at 1 mA cm ⁻² and 1 mAh cm ⁻² . The Ga–Sn/Li||NCM811 full cells maintain a capacity of more than 125.7 mAh g ⁻¹ after 200 cycles at a rate of 0.5 C, representing a capacity retention rate of 86.7%. This study proposes a simple way for the practical application of Li metal anodes and demonstrates the potential of the Ga–Sn alloy interface.