POS6-0561
Synergistic Effect of Ionic Liquid and ZIF-8 to Enhance Ion Transport in PEO-Based Solid Polymer Electrolytes
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
Sanghee Park (Chonnam National University)
Co-Author(s)
Abstract
Lithium metal batteries (LMBs) have garnered significant attention as next-generation energy storage systems due to their high theoretical capacity and low redox potential. However, safety concerns arising from lithium dendrite growth and flammable liquid electrolytes hinder their commercialization. As a promising alternative, polyethylene oxide (PEO)-based solid polymer electrolytes (SPEs) have been widely investigated owing to their excellent flexibility, processability, and chemical stability against lithium metal. Nevertheless, the high crystallinity of PEO at room temperature results in poor ionic conductivity, which severely limits cell performance.Herein, we propose a synergistic strategy to suppress PEO crystallinity and maximize lithium-ion transport kinetics by incorporating a dual-additive system comprising the ionic liquid [BMIM][DCA] and the metal-organic framework (MOF) ZIF-8. The ionic liquid [BMIM][DCA] effectively disrupts the packing of PEO chains, expanding the amorphous domains. Concurrently, the well-defined porous structure of ZIF-8 immobilizes the DCA anions of the ionic liquid through physico-chemical interactions, facilitating selective Li+ transport. Consequently, the optimized composite electrolyte exhibits a significantly enhanced ionic conductivity of 1.1✕10-5 S/cm at room tempareature and 2.1✕10-3 S/cm at 60℃, alongside a remarkably high lithium-ion transference number Li+ = 0.61. This combination of an ionic liquid and porous nanoparticles demonstrates that the synergistic effect establishes efficient Li+ conduction pathways within the polymer matrix, providing an effective approach to enhance the performance of lithium metal batteries.
