Complete neglect of differential overlap study of the binding of salts to N-methyl acetamide

Abdulnur, Suheil F.; Laki, K.

doi:10.1016/s0006-3495(79)85196-6

Cited by 10 publications

(10 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In other words, the interactions of the acetamide (−CO−NH−CH 3 ) groups with ions (cations and anions) can lead to a formation of coordinated complexes producing microdomains in solution as supported by several works. 21−23 Abdulnur and Laki have calculated optimal distance of approach for lithium cations to the oxygen atom on the MAc structure, which is close to d = 2.16 Å, 22 Additionally, they evaluated also the interaction energy of the Li + with MAc as ΔE = 346.9 kJ/mol. 22 These considerations can be used to explain the behavior of adsorption in the activated carbon as electrochemical double-layer capacitor material according to the pore size and shape as discussed below.…”

Section: Methodsmentioning

confidence: 95%

“…21−23 Abdulnur and Laki have calculated optimal distance of approach for lithium cations to the oxygen atom on the MAc structure, which is close to d = 2.16 Å, 22 Additionally, they evaluated also the interaction energy of the Li + with MAc as ΔE = 346.9 kJ/mol. 22 These considerations can be used to explain the behavior of adsorption in the activated carbon as electrochemical double-layer capacitor material according to the pore size and shape as discussed below. The ionic bond in selected DESs based on LiX−MAc mixtures is a weakening process between LiX and MAc.…”

Section: Methodsmentioning

confidence: 95%

See 1 more Smart Citation

Deep Eutectic Solvents Based on N-Methylacetamide and a Lithium Salt as Electrolytes at Elevated Temperature for Activated Carbon-Based Supercapacitors

et al. 2014

View full text Add to dashboard Cite

This study describes the utilization of deep eutectic solvents (DESs) based on the mixture of the N-methylacetamide (MAc) with a lithium salt (LiX, with X = bis[(trifluoromethyl)sulfonyl]imide, TFSI; hexafluorophosphate, PF 6 ; or nitrate, NO 3 ) as electrolytes for carbon-based supercapacitors at 80°C. The investigated DESs were formulated by mixing a LiX with the MAc (at x Li = 0.25). All DESs show the typical eutectic characteristic with eutectic points localized in the temperature range from −85 to −52°C. Using thermal properties measured by differential scanning calorimetry (DSC), solid−liquid equilibrium phase diagrams of investigated LiX−MAc mixtures were then depicted and also compared with those predicted by using the COSMOThermX software. However, the transport properties of selected DESs (such as the conductivity (σ) and the fluidity (η −1 )) are not very interesting at ambient temperature, while by increasing the temperature up to 80°C, these properties become more favorable for electrochemical applications, as shown by the calculated Walden products: w = ση −1 (mS cm −1 Pa −1 s −1 ) (7 < w < 16 at 25°C and 513 < w < 649 at 80°C). This "superionicity" behavior of selected DESs used as electrolytes explains their good cycling ability, which was determined herein by cyclic voltammetry and galvanostic charge−discharge methods, with high capacities up to 380 F g −1 at elevated voltage and temperature, i.e., ΔE = 2.8 V and 80°C for the LiTFSI−MAc mixture at x Li = 0.25, for example. The electrochemical resistances ESR (equivalent series resistance) and EDR (equivalent diffusion resistance) evaluated using electrochemical impedance spectroscopy (EIS) measurements clearly demonstrate that according to the nature of anion, the mechanism of ions adsorption can be described by pure double-layer adsorption at the specific surface or by the insertion of desolvated ions into the ultramicropores of the activated carbon material. The insertion of lithium ions is observed by the presence of two reversible peaks in the CVs when the operating voltage exceeds 2 V. Finally, the efficiency and capacitance of symmetric AC/AC systems were then evaluated to show the imbalance carbon electrodes caused by important lithium insertion at the negative and by the saturation of the positive by anions, both mechanisms prevent in fact the system to be operational. Considering the promising properties, especially their cost, hazard, and risks of these DESs series, their introduction as safer electrolytes could represent an important challenge for the realization of environmentally friendly EDLCs operating at high temperature.

show abstract

Section: Methodsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 95%

Deep Eutectic Solvents Based on N-Methylacetamide and a Lithium Salt as Electrolytes at Elevated Temperature for Activated Carbon-Based Supercapacitors

et al. 2014

View full text Add to dashboard Cite

show abstract

“…This formation of micro-domains is supported by several works dealing with infrared 39 and dielectric relaxation measurements 40 which have provided an estimation of this domain size in the (amide + salt) DES. For example, Abdulnur and Laki 41 shown that the cation-MAc-anion interactions in solution result in a net residual charge on MAc, which becomes less positive as the difference in charge density between the anion and the cation of the salt increases. Authors have then calculated the optimal distance of approach for lithium cations to the oxygen atom on the MAc structure, which is close to d = 2.16 Å, and the resultant electronic charge on MAc, obtained from Mulliken population analysis, is close to Q = +0.27.…”

Section: Physical Properties Of the Desmentioning

confidence: 99%

Deep eutectic solvents based on N-methylacetamide and a lithium salt as suitable electrolytes for lithium-ion batteries

Boisset

Menne

Jacquemin

et al. 2013

Phys. Chem. Chem. Phys.

173

164

View full text Add to dashboard Cite

In this work, we present a study on the physical and electrochemical properties of three new Deep Eutectic Solvents (DESs) based on N-methylacetamide (MAc) and a lithium salt (LiX, with X = bis[(trifluoromethyl)sulfonyl]imide, TFSI; hexafluorophosphate, PF6; or nitrate, NO3). Based on DSC measurements, it appears that these systems are liquid at room temperature for a lithium salt mole fraction ranging from 0.10 to 0.35. The temperature dependences of the ionic conductivity and the viscosity of these DESs are correctly described by using the Vogel-Tammann-Fulcher (VTF) type fitting equation, due to the strong interactions between Li(+), X(-) and MAc in solution. Furthermore, these electrolytes possess quite large electrochemical stability windows up to 4.7-5 V on Pt, and demonstrate also a passivating behavior toward the aluminum collector at room temperature. Based on these interesting electrochemical properties, these selected DESs can be classified as potential and promising electrolytes for lithium-ion batteries (LIBs). For this purpose, a test cell was then constructed and tested at 25 °C, 60 °C and 80 °C by using each selected DES as an electrolyte and LiFePO4 (LFP) material as a cathode. The results show a good compatibility between each DES and LFP electrode material. A capacity of up to 160 mA h g(-1) with a good efficiency (99%) is observed in the DES based on the LiNO3 salt at 60 °C despite the presence of residual water in the electrolyte. Finally preliminary tests using a LFP/DES/LTO (lithium titanate) full cell at room temperature clearly show that LiTFSI-based DES can be successfully introduced into LIBs. Considering the beneficial properties, especially, the cost of these electrolytes, such introduction could represent an important contribution for the realization of safer and environmentally friendly LIBs.

show abstract

“…The strong interaction of the acetamide (-CO-NH-CH 3 ) groups with ions (cations and anions) can lead to the formation of coordinated complexes producing microdomains in solution as demonstrated by infrared and dielectric relaxation measurements. 25 The (N-H-O) hydrogen bond in the solvent explains the solid state of MAc at room temperature, by adding NaNO 3 the interaction between MAc and salt weakens or even breaks this intra (N-H-O) hydrogen bond due to the competitive Na + -O interactions in solution. With these new room temperature molten salt electrolytes, besides considering the applied voltage window in electrochemical systems like supercapacitors, the ion dimensions and solvent polarizability should also be considered.…”

Section: Electrochemical Studymentioning

confidence: 99%

Deep eutectic solvent based on sodium cations as an electrolyte for supercapacitor application

2014

View full text Add to dashboard Cite

show abstract

Complete neglect of differential overlap study of the binding of salts to N-methyl acetamide

Cited by 10 publications

References 6 publications

Deep Eutectic Solvents Based on N-Methylacetamide and a Lithium Salt as Electrolytes at Elevated Temperature for Activated Carbon-Based Supercapacitors

Deep Eutectic Solvents Based on N-Methylacetamide and a Lithium Salt as Electrolytes at Elevated Temperature for Activated Carbon-Based Supercapacitors

Deep eutectic solvents based on N-methylacetamide and a lithium salt as suitable electrolytes for lithium-ion batteries

Deep eutectic solvent based on sodium cations as an electrolyte for supercapacitor application

Contact Info

Product

Resources

About