· Title: Ionic Covalent Organic Framework Solid-State Electrolytes (iCOF SSEs)

· Speakers: Prof. Yoonseob Kim (The Hong Kong University of Science and Technology; HKUST)

· Date: 2025.5.22(Thurs.), 16:00 ~ 17:00

· Venue: W1-1, #2430 (주흘회의실)

·  Abstract:

One of the recently developed polymers with high porosity and crystallinity, called porous crystalline polymers, includes covalent organic frameworks (COFs). COFs with ionic functional groups can rapidly, selectively, and reliably transport ions, e.g., Li+, Na+, Zn2+, or Ca2+. These ionic COFs (iCOFs) are incorporated in energy devices for enhanced transport and safety, outperforming known electrolytes and enabling the next-generation batteries. A key feature of the iCOFs is that they are solid-state single-ion conductors. We developed new iCOFs, such as the ones bearing hypervalent nodes, redox-active moieties, or three-dimensional network topologies. We have demonstrated that iCOF-based batteries offer significantly improved safety while maintaining the same high performance as those with liquid electrolytes. The iCOFs we have developed showed the highest Li+ conductivity of 9.8 mS cm–1 at r.t. and a transference number of 0.92 (J. Am. Chem. Soc. 2023). We recently demonstrated that iCOF/polymer composite can be an excellent all-solid-state electrolyte for lithium metal batteries (LMBs), meeting industry standards (Adv. Energy Mater. 2024). We also demonstrated that multicomponent reactions can yield iCOF-based quasi-solid-state electrolytes (QSSEs) for LMBs (Angew. Chem. Int. Ed. 2024), and phosphonium COFs as QSSEs for zinc–air batteries (Angew. Chem. Int. Ed. 2024). Current efforts include iCOF applications in high-valent ion batteries, e.g., Ca-ion batteries, development of COF-based cathodes for lithium–sulfur batteries, etc. Overall, iCOF’s advantageous properties realize the next-generation batteries (Advanced Materials 2021; Advanced Materials 2024).