Polyvinylpyrrolidone–LiClO4 solid polymer electrolyte and its application in transparent thin film supercapacitors

• The conductivity of PVP depends on the concentration of LiClO4.
• PVP–LiClO4 layers exposed to air were characterized by ATR and TGA-DSC.
• A residual amount of ethanol preserves a good ionic conductivity.
• It was made a transparent glass/ITO/PEDOT/PVP–LiClO4/PEDOT/ITO/glass capacitor.
• It was studied the effect of the aging time on the performance of the capacitor.

Films of PVP (polyvinylpyrrolidone) and LiClO4 have been obtained by dip coating to be used as solid ionic conductors in transparent energy storage systems. The dependence of the ionic conductivity of PVP/LiClO4 films on temperature, lithium salt concentration, and residual solvent content or humidity has been studied. The films were used in a symmetrical supercapacitor (PEDOT/PVP/PEDOT). Whose behaviour with the aging time was analysed as well. It was observed that the experimental differences in the performance of a lithium ion based energy storage devices using these films as solid electrolyte may be due to changes in the residual content of the solvent used in their preparation or the hygroscopic nature of the electrolyte.

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