P(TBA-LiATFSI) : A Single-Ion Conducting Binder with High Ionic Conductivity and Electrochemical Stability for Dual-Ion Batteries
발표자
문세정 (서강대학교)
연구책임자
김형준 (서강대학교)
공동저자
문세정 (서강대학교), 김형준 (서강대학교)
초록
내용
High-energy lithium-ion (LIBs) and dual-ion batteries (DIBs) require improved binders for better performance and stability. Conventional binders like PVDF and PAA face challenges with silicon anodes and high-voltage cathodes. We developed P(TBA-LiATFSI), a single-ion conducting polymer binder from Li[ATFSI], a lithium sulfonylimide salt, and tert-butyl acrylate (TBA). SuFEx synthesis enables large-scale, pure Li[ATFSI] monomer production. TBA can be thermally converted to PAA, avoiding side reactions in direct P(PAA-LiATFSI) synthesis. Among samples with varying Li[ATFSI] content (0, 0.2, 0.5, 0.8), P(TBA-LiATFSI) 0.2 showed best results. In dual-ion batteries with natural graphite cathodes and lithium anodes, P(TBA-LiATFSI) 0.2 outperformed commercial PVDF binders in capacity, coulombic efficiency, and rate capability. Its flexibility and ionic conductivity make it promising for high-voltage batteries. Future work will explore other monomers via SuFEx,and LIB uses.