POS6-0291
Zwitterion Incorporation Mode Modulates Ion Coordination in Single-Ion Conducting Polyether Electrolytes
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
Jiyoung Lee (Yonsei University)
Co-Author(s)
Abstract
Single-ion conducting polymer electrolytes (SIPEs) are promising solid-state electrolyte candidates because they can suppress anion migration and improve Li+ transference. However, their ionic conductivity is often limited by strong ion-polymer interactions and restricted segmental dynamics. Zwitterionic groups can modulate local ion coordination and enhance ion transport, but the influence of their incorporation mode remains poorly understood.
Here, the effect of zwitterion incorporation mode on ion transport behavior was systematically investigated in polyether-based SIPEs. A common orthogonally functionalizable polyether backbone was used to prepare two types of SIPEs: copolymers with covalently incorporated zwitterionic units and blends composed of zwitterionic polymer and SIPEs. This design enabled direct comparison of ion transport behavior at equivalent zwitterion contents.
Both systems exhibited non-monotonic glass transition temperature behavior, indicating that the segmental dynamics were governed by the interplay between plasticization effects and ionic interactions. In copolymers, ionic conductivity decreased with increasing zwitterion content; however, the normalized conductivity collapsed onto a single master curve after normalized for Li+ concentration and segmental dynamics, suggesting that ion transport is primarily controlled by polymer dynamics and effective charge carrier density. In constrast, blends showed the highest conductivity at an intermediate zwitterion content, likely due to enhanced segmental mobility, electrostatic screening, and modified Li+ coordination environments. At excessive zwitterion loading, however, reduced transport efficiency was observed, suggesting less favorable ionic environments and local heterogeneity.
These results provide mechanistic insight into how zwitterion incorporation mode governs ion transport, offering structure-property guidelines for the design of high-performance polymer electrolytes.
Here, the effect of zwitterion incorporation mode on ion transport behavior was systematically investigated in polyether-based SIPEs. A common orthogonally functionalizable polyether backbone was used to prepare two types of SIPEs: copolymers with covalently incorporated zwitterionic units and blends composed of zwitterionic polymer and SIPEs. This design enabled direct comparison of ion transport behavior at equivalent zwitterion contents.
Both systems exhibited non-monotonic glass transition temperature behavior, indicating that the segmental dynamics were governed by the interplay between plasticization effects and ionic interactions. In copolymers, ionic conductivity decreased with increasing zwitterion content; however, the normalized conductivity collapsed onto a single master curve after normalized for Li+ concentration and segmental dynamics, suggesting that ion transport is primarily controlled by polymer dynamics and effective charge carrier density. In constrast, blends showed the highest conductivity at an intermediate zwitterion content, likely due to enhanced segmental mobility, electrostatic screening, and modified Li+ coordination environments. At excessive zwitterion loading, however, reduced transport efficiency was observed, suggesting less favorable ionic environments and local heterogeneity.
These results provide mechanistic insight into how zwitterion incorporation mode governs ion transport, offering structure-property guidelines for the design of high-performance polymer electrolytes.
