Abstract
Poly(ethylene glycol)/poly(2-acrylamido-2-methyl-1-propane sulfonic acid) (PEG/PAMPS) with a transparent appearance were prepared in the presence of ammonium persulfate (APS) as an initiator at 70 °C for 24 h. PEG/PAMPS-based polymer gel electrolytes in a motionless and uniform state were obtained by adding the required amount of liquid electrolytes to a dry PEG/PAMPS polymer. Liquid electrolytes include organic solvents with high boiling points (-1-methyl-2-pyrrolidone (NMP) and γ-butyrolactone (GBL)) and a redox couple (alkali metal iodide salt/iodine). The optimized conditions for PEG/PAMPS-based gel electrolytes based on the salt type, the concentration of alkali metal iodide salt/iodine, and solvent volume ratio were determined to be NaI, 0.4 M NaI/0.04 M I2, and NMP:GBL (7:3, v/v), respectively. The highest ionic conductivity and the liquid electrolyte absorbency were 2.58 mS cm−1 and 3.6 g g−1 at 25 °C, respectively. The ion transport mechanism in both the polymer gel electrolytes and liquid electrolytes is investigated extensively, and their best fits with respect to the temperature dependence of the ionic conductivity are determined with the Arrhenius equation.
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This study was supported by a research fund of Istanbul University with project nos. 27915 and 33168.
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▪This study provides a useful approach to prepare and characterize polymer gel electrolytes based on the strong acidic monomer 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS).
▪Among the different salts studied, NaI indicates the best performance on the ionic conductivity and liquid electrolyte absorbency of polymer gel electrolytes.
▪The highest ionic conductivity of the PEG/PAMPS-based polymer gel electrolytes is 2.58 mS cm−1 at room temperature.
▪The ionic conductivity mechanism follows the Arrhenius relationship.
▪The amorphous state plays an important role to improve ionic conductivity, and the amorphous property of the polymer gel electrolytes is confirmed by characterization studies.
▪A positive effect of PAMPS on amorphous structures is observed.
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Çavuş, S., Yıldıran, M. Poly(ethylene glycol)/poly(2-acrylamido-2-methyl-1-propane sulfonic acid) gel electrolytes: a detailed investigation of their conductivity and characterization. Ionics 22, 1059–1073 (2016). https://doi.org/10.1007/s11581-016-1649-6
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DOI: https://doi.org/10.1007/s11581-016-1649-6