| 초록 |
One of the major challenges in the development of lithium ion batteries consisting of an electrolyte and electrodes is how to achieve high conductivity of the electrolyte without sacrificing its mechanical properties. We successfully prepare a chemically cross-linked epoxy-based solid polymer electrolyte (SPE) with outstanding mechanical and ion transport properties, using an epoxy ring-opening polymerization. In the SPE, a diglycidyl ether of bisphenol-A (DGEBA) epoxy resin was combined with an ionic liquid (BMIM TFSI), a lithium salt (LiTFSI), and a poly(ethyleneglycol)diglycidyl ether (PEGDE). The mixture was then thermally cured with a methyl tetrahydrophthalic anhydride (MeTHPA) curing agent and a benzyldimethylamine (BDMA) catalyst. The mechanical properties and ion conductivity of these epoxy-based SPEs were investigated using DMA, DRS and EIS. The SPEs exhibit high room temperature ion conductivity (3x10-4 S/cm) and stretchability (elongation at break ~ 140 %). |
