Effect of the Poly(ethylene glycol) Diacrylate (PEGDA) Molecular Weight on Ionic Conductivities in Solvent-Free Photo-Cross-Linked Solid Polymer Electrolytes

To obtain safe, high-performance Li-ion batteries, thedevelopmentof electrolytes with high impact resistance and high ionic conductivityis important. Ionic conductivity at room temperature has been improvedby using poly(ethylene glycol) (PEG) diacrylate (PEGDA) to form three-dimensional(3D) networks and solvated ionic liquids. However, the effects ofthe molecular weight of PEGDA on ionic conductivities and the relationshipbetween ionic conductivities and network structures of cross-linkedpolymer electrolytes have not been discussed in detail. In this study,the dependence of the ionic conductivity of photo-cross-linked PEGsolid electrolytes on the molecular weight of the PEGDA was evaluated.X-ray scattering (XRS) gave detailed information about the dimensionsof 3D networks formed by the photo-cross-linking of PEGDA, and theeffects of the network structures on the ionic conductivities werediscussed.

Automated summary

To achieve safe and high-performance Li-ion batteries, it is crucial to develop electrolytes with high impact resistance and high ionic conductivity. The use of poly(ethylene glycol) diacrylate (PEGDA) to form 3D networks and solvated ionic liquids has improved the ionic conductivity at room temperature. However, the effects of PEGDA's molecular weight on ionic conductivities and the relationship between ionic conductivities and network structures of cross-linked polymer electrolytes have not been thoroughly discussed.