Highly efficient supercapacitor using single-walled carbon nanotube electrodes and ionic liquid incorporated solid gel electrolyte

Abstract

Gel polymer electrolyte (GPE) comprising a low viscosity ionic liquid, that is, 1-propyl-3-methyl imidazolium bis(trifluoromethyl sulfonyl)imide (PMI-TFSI, viscosity 38 cP at 20°C) and a polymer, that is, polyvinyl alcohol (PVA) have been prepared using solution cast technique and characterized by impedance spectroscopy, X-ray diffraction, differential scanning calorimetry, optical microscopy, and Fourier transform infrared spectroscopy. Blending PMI-TFSI with PVA matrix hindered the crystallinity of polymer matrix and presented remarkable enhancement in electrical conductivity with a conductivity maxima at 250 wt% PMI-TFSI. The prepared electric double-layer capacitor using single-walled carbon nanotube as symmetric electrodes and PVA:250 wt% PMI-TFSI as GPE presented a capacitance value of about 28 F g−1.

Ionic liquid (1-hexyl-3-methylimidazolium iodide)-incorporated biopolymer electrolyte for efficient supercapacitor

“…where Z ″ is the imaginary part of impedance at the lowest frequency. 9 –15 The value of specific capacitance we have calculated using low-frequency impedance is 24.8 F g −1 .…”

Ionic liquid dispersed highly conducting polymer electrolyte for supercapacitor application: Current scenario and prospects “ICSEM 2021”

“…Carbon black, carbide-derived carbon, activated carbon, carbon nanofibers, carbon nanotubes, carbon aerogels, porous carbon, graphene quantum dots, onion-like carbon, graphene and carbon foams, and other carbon-based compounds have been used as electrode materials in supercapacitors due to their outstanding electrical conductivity, large surface area, controlled pore size distribution and light weight. 24,25…”

“…Carbon black, carbide-derived carbon, activated carbon, carbon nanofibers, carbon nanotubes, carbon aerogels, porous carbon, graphene quantum dots, onion-like carbon, graphene and carbon foams, and other carbon-based compounds have been used as electrode materials in supercapacitors due to their outstanding electrical conductivity, large surface area, controlled pore size distribution and light weight. 24,25 Because of its attractive properties, activated carbon (AC) was used as a common electrode material in EDLCs. The principal advantages of using AC are its low cost, large specific surface area (1,000-2,500 m 2 g À1 ) and high porosity.…”

“…Single Walled Carbon Nanotube (SWCNT) and poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) as binder were taken in appropriate proportions, 25 and thoroughly mixed in mortar and pestle using acetone to make a homogeneous paste to be used in the construction of electrodes. It is then coated on flexible high-density 0.25 mm thick graphite sheets and left overnight at room temperature before being used as electrodes.…”

Polyvinylpyrrolidone with ammonium iodide and plasticizer ethylene carbonate solid polymer electrolyte for supercapacitor application

“…In the past, various methods have been used to enhance the ionic conductivity of SPEs. [11][12][13][14][15] Since decades, researchers have reported solid polymer electrolytes for electrochemical applications due to its various advantages over liquid electrolytes [16][17][18][19] such as no leakage problem, mechanically stable, large electro stability window, and long life,. making it a promising material for various applications such as dye-sensitized solar cells, batteries, and supercapacitor.…”