POS4-1434
Micellization of SIS Triblock Copolymer toward Improving Ionic Conductivity of All-Solid-State Battery Binders
Topic
S4. Colloids, Interfaces, and Molecular Assemblies for Functional Soft Materials
When and Where
Oct 1, 2026
08:30 - 09:30
Room 301 (Grand Ballroom)
Session Chairs
Jinkee HONG
Ki Su KIM
Presenter(s)
Ahjeong kim (Department of Organic Materials Engineering)
Co-Author(s)
Abstract
All-solid-state batteries are attracting attention as next-generation energy storage systems because solid electrolytes can improve safety and enable high energy density. Sulfide-based solid electrolytes are promising due to their high lithium-ion conductivity and processability. However, since the active material, solid electrolyte, and conductive additive are all solids, sufficient interfacial contact and continuous ion-transport pathways must be maintained. Poor contact or blocked interfaces can increase resistance and limit electrode reactions.
Binders maintain electrode integrity by connecting the components and reducing mechanical damage during fabrication and cycling. However, conventional polymer binders may form continuous films on particle surfaces, decreasing direct contact between the active material and solid electrolyte and obstructing lithium-ion transport. Binder design should therefore consider both adhesion and spatial distribution. In wet processing, binder-solvent interactions influence the final electrode structure.
In this study, a styrene-isoprene-styrene (SIS) triblock copolymer was used to control binder morphology through solvent selectivity. Differences in solvent affinity between the polystyrene and polyisoprene blocks were utilized to induce a locally distributed micelle-like structure instead of a continuous film. This approach was designed to create discrete binding points between particles while preserving the active material-solid electrolyte interface. Rather than increasing the intrinsic ionic conductivity of SIS, the aim was to secure effective lithium-ion transport pathways by minimizing excessive binder coverage.
The proposed point-contact structure is expected to reduce blockage of active interfaces, maintain particle adhesion, and improve ion-transport continuity. This study provides a structural strategy for all-solid-state battery electrodes that balances mechanical stability with efficient ion transport.
Binders maintain electrode integrity by connecting the components and reducing mechanical damage during fabrication and cycling. However, conventional polymer binders may form continuous films on particle surfaces, decreasing direct contact between the active material and solid electrolyte and obstructing lithium-ion transport. Binder design should therefore consider both adhesion and spatial distribution. In wet processing, binder-solvent interactions influence the final electrode structure.
In this study, a styrene-isoprene-styrene (SIS) triblock copolymer was used to control binder morphology through solvent selectivity. Differences in solvent affinity between the polystyrene and polyisoprene blocks were utilized to induce a locally distributed micelle-like structure instead of a continuous film. This approach was designed to create discrete binding points between particles while preserving the active material-solid electrolyte interface. Rather than increasing the intrinsic ionic conductivity of SIS, the aim was to secure effective lithium-ion transport pathways by minimizing excessive binder coverage.
The proposed point-contact structure is expected to reduce blockage of active interfaces, maintain particle adhesion, and improve ion-transport continuity. This study provides a structural strategy for all-solid-state battery electrodes that balances mechanical stability with efficient ion transport.
