Correlation between Segmental Dynamics and Charge Carrier Relaxation in Blend Solid Polymer Electrolyte : Effects of Molecular Weight and Concentration
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Lithium-based rechargeable batteries are sought for high energy density and cycling life. However, safety concerns arise from using liquid electrolytes, increasing fire risk. As a solution, researchers investigate solid polymer electrolytes (SPE) as potential replacements. However, their ionic conductivity at room temperature remains low mainly due to the slow segmental motion in the crystalline region. To address this issue, we introduce a SPE by incorporating low molecular weight (MW) poly(ethylene glycol) (PEG) to suppress crystallization. To compensate for the weak properties resulting from the low MW of PEG, poly(vinylidene fluoride) was blended, which possesses excellent mechanical and thermal properties. Our SPE exhibited an outstanding ionic conductivity (2.1x10-4 S/cm) at room temperature. We thoroughly investigated the relationship between MW, concentration, and ionic conductivity and found a strong correlation between the segmental dynamics and charge carrier relaxation.