Lithiophilic Cu-Li 2 O matrix on a Cu Collector to Stabilize Lithium Deposition for Lithium Metal Batteries

[摘要] Lithium metal anode is the most ideal candidate for next-generation energy storage system. However, the uncontrolled dendrite growth, infinite volume expansion, and undesired side reactions lead to serious safety issues and hinder their potential application. Herein, a pre-lithiation strategy is proposed to construct a high-lithiophilic Cu-Li 2 O matrix on commercial Cu foil. The in situ-generated Li 2 O promises adequate nucleation sites and strengthens solid electrolyte interphase and lateral lithium deposition. Meanwhile, the existence of 3D matrix reduces the local current density. The synergy effect of Li 2 O and Cu suppresses the growth of lithium dendrites. As a result, Cu-Li 2 O matrix reveals an enhanced lithium plating/stripping behavior with Coulombic efficiency of 98.46% after 270 cycles. The symmetrical cell assembled by Li-plated electrodes displays a prolonged lifespan of 1400 h. The work demonstrates a scalable and effective approach for modified current collectors toward stable Li metal anode.

[关键词] Cu-Li2O matrix;current collectors;Li metal anodes;SEI film