Ion Dynamics in Ionic-Liquid-Based Li-Ion Electrolytes Investigated by Neutron Scattering and Dielectric Spectroscopy

Jafta, Charl J.; Bridges, Craig; Haupt, Leon; Do, Changwoo; Sippel, Pit; Cochran, Malcolm J.; Krohns, Stephan; Ohl, Michael; Loidl, Alois; Mamontov, Eugene; Lunkenheimer, Peter; Dai, Sheng; Sun, Xiao-Guang

doi:10.1002/cssc.201801321

Ion Dynamics in Ionic-Liquid-Based Li-Ion Electrolytes Investigated by Neutron Scattering and Dielectric Spectroscopy

Journal Article · Tue Aug 21 00:00:00 EDT 2018 · ChemSusChem

DOI:https://doi.org/10.1002/cssc.201801321· OSTI ID:1479749

^[1]; ^[1]; Haupt, Leon ^[2]; ^[3]; Sippel, Pit ^[2]; Cochran, Malcolm J. ^[3]; Krohns, Stephan ^[2]; ^[4]; ^[2]; ^[3]; ^[2]; ^[5]; ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Science Division
Univ. of Augsburg (Germany). Experimental Physics V. Center for Electronic Correlations and Magnetism
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Forschungszentrum Julich (Germany). Jülich Centre for Neutron Science
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Science Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry

A detailed understanding of the diffusion mechanisms of ions in pure and doped ionic liquids remains an important aspect in the design of new ionic-liquid electrolytes for energy storage. Here, to gain more insight into the widely used imidazolium-based ionic liquids, the relationship between viscosity, ionic conductivity, diffusion coefficients, and reorientational dynamics in the ionic liquid 3-methyl-1-methylimidazolium bis(trifluoromethanesulfonyl)imide (DMIM-TFSI) with and without lithium bis(trifluoromethanesulfonyl)imide (Li-TFSI) was examined. The diffusion coefficients for the DMIM⁺ cation and the role of ion aggregates were investigated by using the quasielastic neutron scattering (QENS) and neutron spin echo techniques. Two diffusion mechanisms are observed for the DMIM⁺ cation with and without Li-TFSI, that is, translational and local. The data additionally suggest that Li⁺ ion transport along with ion aggregates, known as the vehicle mechanism, may play a significant role in the ion diffusion process. These dielectric-spectroscopy investigations in a broad temperature and frequency range reveal a typical α–β-relaxation scenario. The α relaxation mirrors the glassy freezing of the dipolar ions, and the β relaxation exhibits the signatures of a Johari–Goldstein relaxation. In contrast to the translational mode detected by neutron scattering, arising from the decoupled faster motion of the DMIM⁺ ions, the α relaxation is well coupled to the dc charge transport, that is, the average translational motion of all three ion species in the material. Finally, the local diffusion process detected by QENS is only weakly dependent on temperature and viscosity and can be ascribed to the typical fast dynamics of glass-forming liquids.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Federal Ministry of Education and Research (BMBF) (Germany); German Research Foundation (DFG); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1479749

Journal Information:: ChemSusChem, Journal Name: ChemSusChem Journal Issue: 19 Vol. 11; ISSN 1864-5631

Publisher:: ChemPubSoc EuropeCopyright Statement

Country of Publication:: United States

Language:: English

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25 ENERGY STORAGE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
dielectric spectroscopy
ion dynamics
ionic liquids
lithium
neutron diffraction

Ion Dynamics in Ionic-Liquid-Based Li-Ion Electrolytes Investigated by Neutron Scattering and Dielectric Spectroscopy

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