Iranian Journal of Chemistry

Iranian Journal of Chemistry

Theoretical study of electron transfer reaction in the anode of Li-Air battery with Cn(mim)22(NTF2) ionic liquid electrolyte: Effect of alkyl chain length

Document Type : Original Article

Authors
Mohamad Mehdi Moghtadaei 1
Saeid Yeganegi 2
Effat Kianpour 1
1 Department of Physical Chemistry, Faculty of Chemistry, University of Mazandaran, P. O. Box 47416-9544, Babolsar, Iran.
2 Phys. Chem. Dept., Faculty of Chemistry, University of Mazandaran, Babolsar, Iran
10.22036/cr.2022.328968.1171
Abstract
In this research, the electron transfer rate of the anodic reaction of the lithium-air battery was theoretically investigated in the presence of the imidazolium-based dicationic ionic liquids (ILs), Cn(mim)22(NTF2), as an electrolyte. For this purpose, the electron transfer rate constant (ket) of the related reaction was calculated using Marcus' theory. Gibbs free energy of the reaction (ΔG0), reorganization energy (λ), and electron coupling energy (VRP) calculated using the density functional theory (DFT) method. All calculations performed using DFT with GGA/revPBE and B3LYP exchange-correlation functional and 6- 311++G** basis set, using NWchem software. Results show that the ket at the anode depends on the solvent dielectric constant. The longer alkyl chains in the ILs resulted in a decrease in dielectric constant and, consequently, a decrease in ket. Calculated ket values for dicationic ILs ranged from 1.312 to 1.416, which are higher values than those of mono-cationic ILs. The findings of this study are important because the ILs are green solvents with tunable properties.

Graphical Abstract

Theoretical study of electron transfer reaction in the anode of Li-Air battery with Cn(mim)22(NTF2) ionic liquid electrolyte: Effect of alkyl chain length
Keywords
Density Functional Theory؛ Dicationic ionic liquids
؛ Electron Transfer Rate Constant
Gibbs Free Energy
Li-Air batteries

Subjects

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Iranian Journal of Chemistry
Volume 5, Issue 1 - Serial Number 8
August 2022
Pages 97-106

  • Receive Date 11 June 2022
  • Revise Date 05 November 2022
  • Accept Date 25 December 2022