Poly(3,4-alkylenedioxythiophene)-Based Supercapacitors Using Ionic Liquids as Supporting Electrolytes

Abstract

A series of dual conducting polymer based type I supercapacitors were constructed using poly͑3,4-propylenedioxythiophene͒ and poly͑3,4-ethylenedioxythiophene͒ as electrode couples. The switching speeds and cycle lifetimes of these supercapacitors were compared using two types of supporting electrolytes; lithium bis͑trifluoromethanesulfonyl͒imide and 1-ethyl-3-methyl-1-Himidazolium bis͑trifluoromethanesulfonyl͒imide ͑a room temperature molten salt͒. The results indicate that supercapacitors using 1-ethyl-3-methyl-1-H-imidazolium bis͑trifluoromethanesulfonyl͒imide as the supporting electrolyte have cycle lifetimes superior to supercapacitors using lithium bis͑trifluoromethanesulfonyl͒imide as the supporting electrolyte.

Polymer Brushes

“…For this reason some IL monomers were prepared, as shown in Figure 31. 10. Figure 31.12 shows the effect of the spacer length on ionic conductivity and the T g 's for EImEO2BS, EImEO8BS, EImPO9BS, and their polymers.…”

Ionic Liquids in Charge Storage Devices: Effect of Purification on Performance

“…All electrochemical techniques were used as described previously 12,13 and all experiments were performed in a dry box. ProDOT and EMIBTI were synthesized according to published procedures 12 .…”

“…ProDOT and EMIBTI were synthesized according to published procedures 12 . Chromatography (as described in the Introduction) was performed on the 50 gram scale and approximately 100 mL fractions were collected until about 90% of the original material was recovered.…”

“…The 2-electrode devices were assembled according to previously published reports 12 . The devices were then switched from 0 to 1.0 Volts at 0.1, 1.0, and 10.0 Volts per second to determine the initial charge capacity and voltage performance.…”

Clay incorporation at the dielectric layer of multilayer polymer films for electrochemical activation

“…17,18 In recent years, significant efforts have been devoted to improve the intrinsic capacitive properties of PEDOT. 11,19 Within this context, composites based on transition-metal oxides (e.g. MnO 2 , NiO, Fe 3 O 4 and V 2 O 5 ) embedded into the PEDOT matrix showed better capacitive properties than pure PEDOT.…”