An Approach to Solid-State Electrical Double Layer Capacitors Fabricated with Graphene Oxide-Doped, Ionic Liquid-Based Solid Copolymer Electrolytes

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.

The Study of Plasticized Amorphous Biopolymer Blend Electrolytes Based on Polyvinyl Alcohol (PVA): Chitosan with High Ion Conductivity for Energy Storage Electrical Double-Layer Capacitors (EDLC) Device Application

“…It can be said that the PVCH3 electrolyte film admirably has electrochemical stability because of the almost nearly rectangular mirror images of the shape of the voltammograms, especially at a high sweep rate. Meanwhile, the CV curve shows an ideal capacitor since the plot possesses no visible peaks in the polarization curve, which means no redox reaction occurred with the voltage of 0.9 V [ 72 , 73 , 74 ]. The specific capacitance C s value of fabricated EDLC achieved in this work was found to be higher than some previously reported works.…”

Optical properties and ionic conductivity studies of an 8 MeV electron beam irradiated poly(vinylidene fluoride-co-hexafluoropropylene)/LiClO4electrolyte film for opto-electronic applications

“…13(b), the CV curve exhibits reversible humps at all scan rates, revealing the redox reaction and conrming the capacitive behavior. 56 Also, with increasing scan rate, the oxidation and reduction peak currents increase signicantly. 57 The observed results suggest that the polymer electrolytes are electrochemically active and an active electrolyte for lithium ion battery applications.…”

Blending and Characteristics of Electrochemical Double-Layer Capacitor Device Assembled from Plasticized Proton Ion Conducting Chitosan:Dextran:NH4PF6 Polymer Electrolytes

“…The redox peak indicates deintercalation/intercalation or Faradaic processes that are entirely dissimilar to the mechanism of energy storage in the EDLC. The EDLC will accumulate energy within adsorption and desorption or non-Faradaic processes [ 52 , 53 , 54 ]. The pattern of the CV has a leaf-like shape at 100 mV/s.…”