Constructing LiF-rich artificial SEI at a two-dimensional copper net current collector in anode-free lithium metal batteries

Abstract

Anode-Free lithium metal batteries (AF-LMBs) show the advantage in reducing the volume change of lithium metal anode, however also suffer from the obstacles of lacking active sites and uneven deposition of lithium. Herein, employing the silver coated two-dimensional (2D) copper net with artificial LiF-rich solid electrolyte interphase (SEI) as the current collector is proposed to address these issues. The 2D copper net has high chemical and volume stability, and the coated silver nanoparticles can provide active sites for lithium deposition. LiF layer can homogenize Li-ion flux and improve the stability of the interface between electrode and electrolyte. By combining the above-mentioned superiorities, compared with the initial copper net, LiF@Li-Ag@Cu maintains higher coulombic efficiencies and enhanced stable cycling over 250 h at a current density of 1 mA cm−2 in the asymmetric cell with Li foil as counter electrode. A good cycling stability can be also observed in a full cell with LiNi0.8Co0.1Mn0.1O2 as positive electrode material.