Electrical and Electronic Devices, Circuits, and Materials

To increase the energy density of the SC, various efforts have been done to tune the voltage window of the electrolytes by the addition of IL and plasticizers [51]. In continuation of this, Kang et al . [52] reported the preparation of solid electrolyte comprising poly(ethylene glycol) behenyl ether methacrylate-gpoly((2-acetoacetoxy)ethyl methacrylate) (PEGBEM-g-PAEMA) graft copolymer by one-pot free-radical polymerization process for application in bendable SC. The ionic conductivity of the PE was 1.23 × 10 -3S/cm and the increase was attributed to high polarity and amorphous nature. Two SC cells were fabricated using PEGBEM-g-PAEMA (Cell-1) and PVA/H 3PO 4(Cell-2) as a solid electrolyte and activated carbon as an electrode. The PEGBEM-g-PAEMA based SC demonstrated the specific capacitance of about 55.5 F/g at 1.0 A/g (for Cell-2: 40.8 F/g at 1.0 A/g) with a power density of 900 and corresponding energy density of 25 Wh/kg. It is important to note that even after bending with an angle of 135 o, the performance was good. Table 3.4 summarizes some reported polymer electrolytes, their ionic conductivity and the electrochemical performance of the cell using them. Table 3.5 shows some patents on the supercapacitor device using different separators.

Table 3.4Reported polymer electrolytes and fabricated supercapacitor performance.

Table 3.5Reported polymer electrolytes and fabricated supercapacitor performance.