Physicochemical properties of (1-butyl-1-methylpyrrolydinium dicyanamide + γ-butyrolactone) binary mixtures

Zec, Nebojša; Bešter‐Rogač, Marija; Vraneš, Milan; Gadžurić, Slobodan

doi:10.1016/j.jct.2015.08.014

Cited by 39 publications

(34 citation statements)

References 56 publications

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“…From Figure 1 it can be seen that specific conductivity for PYR 14 TFSI/GBL/LiTFSI increases with temperature and decreases when a LiTFSI is added to make an electrolyte solution. For the solutions containing 1 mol · dm −3 Li + it was found that specific conductivity increases from 3.9 mS · cm −1 at 0 • C to 14.1 mS · cm −1 at 50…”

Section: Resultsmentioning

confidence: 99%

“…After that chemicals were kept in an argon-filled glove box. The water content (mass fraction) in H5101 PYR 14 TFSI and GBL was determined by Karl Fisher titration and confirmed to be 44 ppm and 76 ppm, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…This mole fraction of binary {PYR 14 TFSI + GBL} mixture was selected since our previous studies indicated that this composition has the highest specific conductivity which is one of the parameters that governs performance of the lithium-ion batteries. 26 For convenience, in this work the electrolyte 1 mol · dm −3 LiTFSI in {PYR 14 TFSI + GBL} (at 0.2 IL mole fraction) will be indicated as PYR 14 TFSI/GBL/LiTFSI. TiO 2 NTAs were prepared by anodic oxidation of 0.25 mm thick and 0.5 cm wide Ti-foil (Alfa Aesar, purity ≥ 0.995).…”

Section: Methodsmentioning

confidence: 99%

“…Mixing of ionic liquids with molecular solvents such as organic carbonates or lactones can reduce viscosity of applied electrolyte. [12][13][14][15] Among other aprotic solvents, γ-butyrolactone (GBL) is usually applied in new generation of LIBs and other electrochemical devices. Besides its low cost, GBL has wide liquidus range and better thermal stability comparing to alkyl carbonate solvents.…”

mentioning

confidence: 99%

“…Besides its low cost, GBL has wide liquidus range and better thermal stability comparing to alkyl carbonate solvents. 16 In our previous papers we demonstrated that binary mixture of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, (IM 14 TFSI), and GBL has around 20% higher specific conductivity at low IL mole fractions compared to IM 14 TFSI + propylene carbonate (PC) binary mixture. 15,17 Xu et al observed similar trend in the case of 1-ethyl-3-methylimidazolium dicyanamide (IM 12 DCA) binary mixtures with GBL and PC.…”

mentioning

confidence: 99%

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Electrochemical Performance of Anatase TiO₂Nanotube Arrays Electrode in Ionic Liquid Based Electrolyte for Lithium Ion Batteries

Zec

Cvjetićanin

Bešter‐Rogač

et al. 2017

J. Electrochem. Soc.

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Ternary electrolyte composed of 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide ionic liquid (PYR 14 TFSI), γ-butyrolactone (GBL) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and anatase TiO 2 nanotube arrays (NTAs) electrode are investigated for the application in new generation of lithium-ion batteries (LIBs). The electrical conductivity and viscosity are measured in the whole composition range at several temperatures. Also, cyclic voltammetry experiments are performed at different temperatures and scan rates. At all scan rates, up to 100 mV · s −1 Ti 4+ /Ti 3+ redox peaks appear designating exceptionally fast intercalation/deintercalation reaction. At the end of cycling the intercalation/deintercalation capacity was 144.8/140.7 mAh · g −1 at current rate 3 C. The diffusion coefficient for Li + extraction from TiO 2 nanotubes (NTs) have been calculated for temperatures from (25 to 55) • C. Activation energy for diffusion was found to be 54.7 kJ/mol (0.57 eV The rapid development of portable electronic devices and technologies significantly increased demand for the next generation of energy storage systems.1 Because of enhanced energy and power density, efficiency and long life, LIBs are currently one of the most promising energy storage devices.2,3 Improvement of safety standards and low impact on human health and environment is essential for large-scale application of LIBs. 4 Safety concerns related to utilization of highly volatile and flammable organic solvents in commercial cells can be addressed by introducing ionic liquids (ILs) as emerging class of fluids.5 Numerous advantages of ILs such as negligible vapor pressure and high chemical and thermal stability make them ideal candidates for their application in LIBs. Potential application of ILs based on a combination of the pyrrolidinium (PYR + ) cation and bis(trifluoromethanesulfonyl)imide (TFSI -) anion as electrolytes in LIBs with long term cycling stability and very good capacity utilization, has been confirmed by several research groups. [6][7][8][9][10][11][12] Nevertheless, the utilization of IL-based electrolytes is usually limited by their high viscosity, which reduces transport capabilities and slows down the chemical processes that occur in these solvents. Mixing of ionic liquids with molecular solvents such as organic carbonates or lactones can reduce viscosity of applied electrolyte. 12-15Among other aprotic solvents, γ-butyrolactone (GBL) is usually applied in new generation of LIBs and other electrochemical devices. Besides its low cost, GBL has wide liquidus range and better thermal stability comparing to alkyl carbonate solvents. 16 In our previous papers we demonstrated that binary mixture of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, (IM 14 TFSI), and GBL has around 20% higher specific conductivity at low IL mole fractions compared to IM 14 TFSI + propylene carbonate (PC) binary mixture.15,17 Xu et al. observed similar trend in the case of 1-ethyl-3-methylimidazolium dicyanamide (IM 12 DC...

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%