Regulating Li+ Transport and Interfacial Stability with Zwitterionic COF Protective Layer Towards High-Performance Lithium Metal Batteries

Abstract The sluggish Li + migration kinetics and unstable electrode/electrolyte interface severely hinder the commercial application of high-performance lithium metal batteries (LMBs). Herein, an artificial protective layer is constructed using zwitterionic covalent organic framework (Z-COF) simultaneously containing sulfonate and ethidium groups, aiming to facilitate rapid, uniform Li + transport and stabilize anode interface. The sulfonate groups with high lithiophilicity provide abundant hopping sites for fast Li + diffusion. The ethidium cations immobilize TFSI − and solvent molecules by ion–dipole interactions, which accelerate the dissociation of LiTFSI and Li + desolvation. Moreover, the monodispersed…