Abstract
Solvation reaction and the ion conduction mechanism in fire‐retardant poly[acrylonitrile] (PAN)‐based gel electrolytes complexed with ethylene carbonate (EC), proplylene carbonate (PC), and were investigated using Fourier transform Raman scattering spectroscopy (FT‐Raman) and conventional complex impedance measurements. FT‐Raman spectroscopy eliminated the fluorescence problem of the gel electrolytes, showing that the mole fraction of EC‐solvating ions is significantly affected by the concentration rather than the PAN ratio. Based on deconvolution analysis, the solvation numbers of ions were estimated to be 4.0 to 5.4 in the salt concentration range of 0.28 to 1.35 mol kg−1, which is corresponding to that in liquid electrolyte‐based EC and PC. As for the ionic conduction property of PAN‐based gel electrolytes, the activation energy of ionic conduction estimated from the Arrhenius equation is more strongly dependent on the concentration than the PAN ratio in the temperature range from −20 °C to room temperature. These results confirm that ions dominantly interact with EC and PC dispersed in the network structure of the gel electrolytes and also the polymer chains of PAN make a rigid framework which scarcely interacts with the ions at ambient temperature.
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