Composition-Driven Design of Solid Polymer Electrolytes: Effects of Non-coordinating and Coordinating Polymers on Ionic Transport in PVDF-HFP/PEG Blends
발표자
윤승한 (서울대학교)
연구책임자
김소연 (서울대학교)
초록
내용
This study explores how coordinating and non-coordinating polymers influence ionic transport in solid polymer blend electrolytes (SPBEs). SPBEs composed of PEG and PVDF-HFP showed ionic conductivity up to 2.21×10⁻⁴ S/cm at 298 K. Spectroscopy revealed that increasing PEG content shifts Li⁺ coordination from solvent-based complexes to PEG ether groups, enabling ion hopping assisted by segmental motion. Ionic conductivity followed VTF behavior, with PEG-rich SPBEs showing lower activation energy and higher pre-exponential factors, indicating enhanced segmental mobility and overcoming the conventional compensation effect. Reduced conductivity analysis confirmed improved intrinsic transport with higher PEG content. Electrochemical tests demonstrated stable lithium plating and stripping with low overpotential in PEG-rich SPBEs. These results highlight that tuning the composition of SPBE offers a strategy for designing high-performance SPBEs for all solid-state lithium batteries.