Effects of end-group on ion transport properties of PEO-based polymer electrolytes
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Solid-state polymer electrolytes have widely been investigated for their potential uses in advanced lithium batteries. Most of them are based on poly(ethylene oxide) (PEO) since the PEO can effectively solvate and conduct lithium ions. The main research aim of PEO-based polymer electrolytes is the simultaneous achievement of high mechanical stability and high ionic conductivity. One of the approach for this is the use of block copolymers, where their microphase separation enables to achieve this based on nanoconfinements. In this study, we investigated poly(styrene-b-ethylene oxide) (PS-b-PEO) block copolymers comprising different end-functional groups. The intrachain interactions between the end-group and PEO backbone resulted in the reduction of PEO crystallinity, linked to the enhanced room temperature conductivity. Furthermore, dipolar interactions between the end-group and lithium salt improved the lithium cation transport efficiency.