POS6-0233
POSS-PEG-based Pore-Filling Solid Electrolyte with Enhanced Li+ Transport and Interfacial Stability for Solid-State Lithium-ion Batteries
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
Bokyung Park (Sungkyunkwan University)
Co-Author(s)
Abstract
To address safety concerns associated with conventional liquid electrolytes, solid electrolytes have emerged as attractive candidates for next-generation batteries. As a promising alternative, solid polymer electrolytes (SPEs) have attracted considerable attention owing to their excellent flexibility, processability, and interfacial contact with electrodes. However, conventional SPEs still suffer from low ionic conductivity and poor mechanical strength. To overcome these challenges, a pore-filling solid electrolyte (PFSE) is developed by infiltrating a polysilsesquioxane-graft-poly(ethylene glycol) (POSS-PEG)-based electrolyte into a porous polytetrafluoroethylene (PTFE) framework. The porous PTFE framework provides excellent thermal stability, mechanical strength, and high porosity, while POSS-PEG, consisting of a rigid POSS core and eight PEG chains, facilitates efficient lithium-ion transport. Additionally, a trimethyl phosphate (TMP)/ethylene carbonate (EC) additive is incorporated to promote lithium salt dissociation and provide a plasticizing effect, impart flame retardancy. As a result, the optimized PFSE achieves high ionic conductivity, a high Li+ transference number, and excellent mechanical strength, and enhanced interfacial and electrochemical stability. Furthermore, when applied to LiNi0.8Co0.1Mn0.1O2-based cells, the PFSE demonstrates excellent charge–discharge performance and long-term cycling stability. This study presents an effective design strategy for PFSEs that simultaneously achieve high ionic conductivity, excellent mechanical strength, and enhanced safety, providing a promising direction for the development of solid-state lithium-ion battery electrolytes
