Covalent Organic Frameworks Construct Precise Lithiophilic Sites for Uniform Lithium Deposition

Lithium (Li) metal represents a promising anode material for constructing high-energy-density rechargeable batteries but is severely limited by uncontrolled Li dendrite growth. Introducing a Li host effectively relieves Li dendrite growth, while precise construction of the lithiophilic sites is essential but insufficient among the current strategies. In this contribution, a covalent organic framework is employed as a Li host to precisely construct the lithiophilic sites with well-defined chemical structure and uniform geometric distribution at the atomic level. The precisely constructed structure delivers maximum efficiency and exposure of the lithiophilic sites. Consequently, the G@COF-1 host reduces Li nucleation overpotentials and favors prolonged lifespan with uniform deposition morphologies, and the G@COF-1-Li composite anode realizes stable cycling in LFP and NCM full cells.