Post-synthetic Fully\nπ‑Conjugated Three-Dimensional\nCovalent Organic Frameworks for High-Performance Lithium Storage

Abstract

A fully π-conjugated nitrogen-rich three-dimensional\ncovalent\norganic framework (<b>PYTRI-COF-2</b>) containing both pyrazine\nand triazine units was prepared through a post-synthetic strategy.\nThe imine linkages in the pre-prepared <b>PYTRI-COF-1</b> were\nconverted into heterocyclic quinoline by the Povarov reaction. The\nobtained <b>PYTRI-COF-2</b> displayed high Li-ion storage capacity\nand excellent cycling stability when it was used as the lithium (Li)-ion\nbattery electrode.