POS6-0662
Ionic Functionalized SEBS-Based Protective Layers for High-Performance Lithium Metal Batteries
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
HyunSoo Kwon (KAIST)
Co-Author(s)
Abstract
Lithium metal batteries (LMBs) have attracted significant attention due to their potential to achieve exceptionally high energy densities. However, continuous electrolyte decomposition during cycling leads to uncontrolled lithium dendrite growth, resulting in severe capacity fade and poor lifespan. To address these challenges, we developed an artificial polymer protective layer based on functionalized styrene-ethylene-butylene-styrene (SEBS). This engineered layer effectively suppresses parasitic electrolyte reactions while ensuring high ionic conductivity and mechanical robustness. By precisely tuning the substitution ratio of pyrrolidinium-FSI ionic groups functionalized onto the SEBS matrix, we identified the optimal balance between ionic transport pathways and elastomeric integrity. Notably, at an optimal ion content of 8 mol% (q8), the protective layer exhibited a high ionic conductivity of 0.85 mS/cm alongside excellent mechanical properties capable of firmly maintaining its structural integrity and dimensional stability during cell operation. An outstanding capacity retention of 80% after 220 cycles was achieved in a full-cell with 40 μm Li anode, 4 mAh cm⁻² cathode, and 5 μL mAh⁻¹ electrolyte, validating its exceptional viability for practical high-energy LMBs.
