Progress and Perspectives of the Covalent Organic Frameworks in Boosting Ions Transportation for High‐Energy Density Li Metal Batteries

ABSTRACT Lithium‐ion batteries have gained widespread application due to their high energy density, stable discharge platforms, and broad operating temperature ranges. However, both liquid and solid‐state battery systems face challenges in lithium metal battery development, primarily caused by uneven lithium deposition that induces dendrite growth, leading to SEI layer damage and eventual short‐circuit failure. Covalent organic frameworks (COFs), crystalline porous materials constructed from organic building units through covalent bonds, have emerged as promising candidates for ion conduction systems owing to their high surface area, tunable pore structures, and diverse functional groups. This review examines the application of COF materials in various components of lithium metal batteries, including separators, SEI layers, and solid‐state electrolytes. It systematically analyzes the performance requirements and research progress of COF‐based solid‐state electrolytes in different cathode systems, while providing perspectives on their future development in battery technologies.