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The dynamic evaporation process of deep eutectic solvent LiTf2N:N-methylacetamide at ambient temperature

Abstract

Lithium-based deep eutectic solvents (DESs) are potential and promising electrolytes for energy-storing devices such as lithium-ion battery and supercapacitor due to their greenness, low cost, favorable stability, and easy for synthesis. LiTf2N (lithium bis(trifluoromethylsulfonyl)imide):NMA (N-methylacetamide) is liquid due to the strong intermolecular H-bonding interaction between H-bonding acceptor (HBA, LiTf2N) and H-bonding donor (HBD, NMA). The properties (melting point, conductivity, viscosity, etc) of LiTf2N:NMA would be changed with the evaporation of NMA from LiTf2N:NMA, which would further influence the performance of the energy-storing devices. The evaporation of DES should be determined by the intermolecular interactions. Here, for the first time, the dynamic process of evaporation and intermolecular interactions of DES LiTf2N:NMA at room temperature were investigated and we find that the evaporation mechanism of DES LiTf2N:NMA can be divided into three stages. In the first stage (before 110 min), H-bonding interaction between O in LiTf2N and NH in NMA is disrupted before destruction of coordinating interaction related to amide II C=O and Li cation. In the second stage (from 110 min to 270 min), the change of coordinating interaction related to amide II C=O and Li cation is also higher than that of H-bonded interaction. In the third stage (after 270 min), evaporation of NMA from LiTf2N:NMA has very little influence on the environment of LiTf2N:NMA. This work provides guide for designing DESs as electrolyte for energy-storing devices such as lithium-ion battery and supercapacitor.

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Supplementary files

Publication details

The article was received on 09 Jan 2019, accepted on 07 May 2019 and first published on 07 May 2019


Article type: Paper
DOI: 10.1039/C9CP00148D
Phys. Chem. Chem. Phys., 2019, Accepted Manuscript

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    The dynamic evaporation process of deep eutectic solvent LiTf2N:N-methylacetamide at ambient temperature

    Y. Chen, D. Yu, L. Fu, M. Wang, D. Feng, Y. Yang, X. Xue, J. Wang and T. Mu, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C9CP00148D

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