The Effect of Li Salt Concentration on Ion Conduction and Morphology of Epoxy-based Solid Polymer Electrolytes for Supercapacitors
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초록
내용
Mechanical robust solid polymer electrolytes (SPEs) are envisioned to be promising alternatives to conventional flammable liquid electrolytes having an explosion issue due to lithium dendrite formation between electrode and electrolyte. However, SPEs usually suffer from a trade-off characteristic between ionic conductivity and mechanical property. In this study, we prepare commercially accessible epoxy-based SPEs containing solvating electrolytes, composed of weak-binding Li salts (LiTFSI), Li solvating glyme, and high conducting ionic liquids. The epoxy resin is used to provide the SPE with high mechanical strength and good processability, while the solvating electrolytes are selected to maximize SPE ionic conductivity. We systematically investigate the effect of the LiTFSI concentration in the solvating electrolyte on ionic conductivity, mechanical and thermal properties, and morphology using dielectric spectroscopy, DMA, DSC, and field-emission electron microscopy, respectively.