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Series of polymer blend consisting of polyethylene oxide (PEO) and graphene oxide (GO) as co-host polymer were prepared using solution cast method. The most amorphous PEO-GO blend was obtained using 90 wt.% of PEO and 10 wt.% of GO as recorded by X-ray diffraction (XRD). Fourier transform infrared spectroscopy (FTIR) analysis proved the interaction between PEO, GO, lithium trifluoromethanesulfonate (LiCF3SO3), and ethylene sulfite (ES). Incorporation of 25 wt.% LiCF3SO3into the PEO-GO blend increases the conductivity to3.84±0.83×10-6 S cm−1. The conductivity starts to decrease when more than 25 wt.% salt is doped into the polymer blend. The addition of 1 wt.% ES into the polymer electrolyte has increased the conductivity to1.73±0.05×10-5 S cm−1. Dielectric studies show that all the electrolytes obey non-Debye behavior.

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Potato starch (PS)/graphene oxide (GO) blend-based solid polymer electrolyte has been doped with lithium trifluoromethanesulfonate (LiCF 3 SO 3 ) via casting method. Lithium-based system is further infused with ionic liquid, 1-butyl-3-methylimidazolium chloride ([Bmim][Cl]) as a plasticizer to form a PS/GO/LiCF 3 SO 3 /[Bmim][Cl] electrolyte with improved conductivity characteristic. The ionic liquid-based polymer electrolyte PS/GO/LiCF 3 SO 3 /[Bmim][Cl] exhibits better physical properties based on structural characterisation and thermal analysis conducted. Values of linear sweep voltammetry (LSV) that evaluates the electrochemical potential window for salted and plasticized systems are 1.38 V and 1.92 V, respectively. Specific capacitance (C s ) values calculated from charge-discharge measurement and cyclic voltammetry (CV) for the plasticized system are higher compared with those for the salted system. From the galvanostatic charge-discharge analysis, the value of C s obtained for PS/GO/LiCF 3 SO 3 /[Bmim][Cl] is 37.9 F g −1 at 0.6 mA cm −2 current density. The results from CV and galvanostatic chargedischarge analysis confirm the suitability of PS/GO/LiCF 3 SO 3 and PS/GO/LiCF 3 SO 3 /[Bmim][Cl] for electrochemical doublelayer capacitor (EDLC) application.