Abstract
Solid polymer electrolyte (SPE) composed of semi-crystalline poly (vinylidene fluoride-hexafluoropropylene) [P(VdF-HFP)] copolymer, 1-ethyl-3-methylimidazolium bis (trifluoromethyl sulphonyl) imide [EMI-BTI] and graphene oxide (GO) was prepared and its performance evaluated. The effects of GO nano-filler were investigated in terms of enhancement in ionic conductivity along with the electrochemical properties of its electrical double layer capacitors (EDLC). The GO-doped SPE shows improvement in ionic conductivity compared to the P(VdF-HFP)-[EMI-BTI] SPE system due to the existence of the abundant oxygen-containing functional group in GO that assists in the improvement of the ion mobility in the polymer matrix. The complexation of the materials in the SPE is confirmed in X-ray diffraction (XRD) and thermogravimetric analysis (TGA) studies. The electrochemical performance of EDLC fabricated with GO-doped SPE is examined using cyclic voltammetry and charge–discharge techniques. The maximum specific capacitance obtained is 29.6 F∙g−1, which is observed at a scan rate of 3 mV/s in 6 wt % GO-doped, SPE-based EDLC. It also has excellent cyclic retention as it is able keep the performance of the EDLC at 94% even after 3000 cycles. These results suggest GO doped SPE plays a significant role in energy storage application.
Highlights
Electronic devices are becoming essential belongings for people around the world in their daily life
We focused on the effect of the addition of different weight percentages of graphene oxide (GO), an inorganic nanofiller into the solid polymer electrolyte
The increase of the ionic conductivity up to 30 wt % of the EMI-BTI added is due to the increasing number of mobile ions [21] and the plasticizing effect from the EMI-BTI ionic liquid [22,23]
Summary
Electronic devices are becoming essential belongings for people around the world in their daily life. It is something that is carried along almost everywhere at all times. The need for these devices to be lightweight, thin and safe is extremely high. The conventional liquid electrolyte batteries used in these electronic devices are mostly bulky and heavy and could cause safety issues due to the risk of harmful liquid leakages [1]. Recent research has shown tremendous advancements in an alternative to liquid electrolyte batteries: solid polymer electrolytes (SPE). Their ability to form thin films, light weight, flexibility and reasonable ionic conductivity are among the useful benefits of using solid polymer electrolyte [2]
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