| 초록 |
In this study, a strategy for synthesizing lithium methacrylate (LiMA)-based self-doped gel polymer and solid polymer electrolytes were described and the electrochemical properties were investigated by impedance spectroscopy and linear sweep voltammetry. LiMA was found to dissolve in ethylene carbonate(EC)/diethylcarbonate(DEC)(3/7,v/v) solvent after complexing with borontrifluoride(BF3). This was achieved by lowering the ionic interactions between the methacrylic anion and lithium cation. As a result, gel and solid polymer electrolytes consisting of BF3-LiMA complexes and poly(ethyleneglycol) acrylate were successfully synthesized by radical polymerization. Despite the self-doped nature of the LiMA salt, an ionic conductivity value of 1.0×10-5 S/cm was achieved at 25 oC in the polymer electrolyte with 49 wt% of polymer content. Furthermore, linear sweep voltammetry measurements showed that the electrochemical stability of the gel polymer electrolyte was around 5.0V at 25 oC. |
