COF?based single Li ⁺ solid electrolyte accelerates the ion diffusion and restrains dendrite growth in quasi?solid?state organic batteries

A solid-state electrolyte (SSE), which is a solid ionic conductor and electron-insulating material, known to play crucial role in adapting lithium metal anode high-capacity cathode battery. Among the various SSEs, single Li-ion has advantages terms of enhancing ion conductivity, eliminating interfacial side reactions, broadening electrochemical window. Covalent organic frameworks (COFs) are optimal platforms for achieving conduction behavior because well-ordered one-dimensional channels precise chemical modification features. Herein, we study depth three types Li-carboxylate COFs (denoted LiOOC-COFn, n = 1, 2, 3) as conducting SSEs. Benefiting from directional channels, LiOOC-COF3 shows an exceptional conductivity 1.36 × 10?5 S cm?1 at room temperature high transference number 0.91. Moreover, it excellent performance with long-term cycling, output, no dendrites quasi-solid-state battery, small molecule cyclohexanehexone (C6O6) Li anode, enables effectively avoiding dissolution electrode by liquid electrolyte.