Ionic Conductivity and Transporting Properties in LiTFSI-Doped Bis (trifluoromethanesulfonyl)imide-Based Ionic Liquid Electrolyte

Wu, Tzi‐Yi; Lin, Haibo; Chen, Pin-Rong; Liao, Jian-Wei

doi:10.1016/s1452-3981(23)14335-5

Cited by 37 publications

(1 citation statement)

References 58 publications

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“…This is consistent with previous reports for ILEs − and ILEs diluted with molecular solvents . In line with increasing viscosity, the conductivity of the ILEs decreases with increasing Li + concentration, in accordance with prior studies for LiTFSI and NaTFSI addition to TFSI-based ILs. − To the authors’ knowledge, there are no prior reports of the viscosity of LCILEs as a function of the metal ion concentration.…”

Section: Resultssupporting

confidence: 92%

Nanostructure of Locally Concentrated Ionic Liquids in the Bulk and at Graphite and Gold Electrodes

Wang,

Buzolic,

Mullen

et al. 2023

ACS Nano

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The physical properties of ionic liquids (ILs) have led to intense research interest, but for many applications, high viscosity is problematic. Mixing the IL with a diluent that lowers viscosity offers a solution if the favorable IL physical properties are not compromised. Here we show that mixing an IL or IL electrolyte (ILE, an IL with dissolved metal ions) with a nonsolvating fluorous diluent produces a low viscosity mixture in which the local ion arrangements, and therefore key physical properties, are retained or enhanced. The locally concentrated ionic liquids (LCILs) examined are 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (HMIM TFSI), 1hexyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate (HMIM FAP), or 1-butyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate (BMIM FAP) mixed with 1,1,2,2-tetrafluoroethyl 2,2,2-trifluoroethyl ether (TFTFE) at 2:1, 1:1, and 1:2 (w/w) IL:TFTFE, as well as the locally concentrated ILEs (LCILEs) formed from 2:1 (w/w) HMIM TFSI−TFTFE with 0.25, 0.5, and 0.75 m lithium bis(trifluoromethylsulfonyl)imide (LiTFSI). Rheology and conductivity measurements reveal that the added TFTFE significantly reduces viscosity and increases ionic conductivity, and cyclic voltammetry (CV) reveals minimal reductions in electrochemical windows on gold and carbon electrodes. This is explained by the small-and wide-angle X-ray scattering (S/WAXS) and atomic force microscopy (AFM) data, which show that the local ion nanostructures are largely retained in LCILs and LCILEs in bulk and at gold and graphite electrodes for all potentials investigated.

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Section: Resultssupporting

confidence: 92%

Nanostructure of Locally Concentrated Ionic Liquids in the Bulk and at Graphite and Gold Electrodes

Wang,

Buzolic,

Mullen

et al. 2023

ACS Nano

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Electrolytes for Lithium Batteries: The Quest for Improving Lithium Battery Performance and Safety

Capiglia

2022

Rechargeable Ion Batteries

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Assessing the Ion Transport Properties of Highly Concentrated Non‐Flammable Electrolytes in a Commercial Li‐Ion Battery Cell

Sälzer

Pescara

Franke

et al. 2019

Batteries & Supercaps

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In order to assess the ion transport properties of alternative non-flammable electrolytes in a typical commercial Li-ion battery cell, we have measured the ionic conductivity s ion and the lithium-ion transference number under anion-blocking conditions, t ABC Li þ , for two classes of highly concentrated battery electrolytes: (i) Mixtures of the ionic liquid N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide (Pyr 13 FSI) with different amounts of the lithium bis(fluorosulfonyl)imide (LiFSI), and (ii) a solvate ionic liquid consisting of an equimolar mixture of tetraglyme (G4) and LiFSI. Together with previously published data on the solvate ionic liquid G4/LiTFSI (1 : 1), the obtained Li + ion transport data was used to estimate the overall resistance and the resulting maximum cycling rate of a commercial 10 Ah Li-ion pouch cell containing these alternative electrolytes. Our results suggest that Pyr 13 FSI/LiFSI mixtures would allow for maximum charging/discharging rates close to 1 C, while the solvate ionic liquids would only support maximum rates of about 0.3 C.

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Ionic Conductivity and Transporting Properties in LiTFSI-Doped Bis (trifluoromethanesulfonyl)imide-Based Ionic Liquid Electrolyte

Cited by 37 publications

References 58 publications

Nanostructure of Locally Concentrated Ionic Liquids in the Bulk and at Graphite and Gold Electrodes

Nanostructure of Locally Concentrated Ionic Liquids in the Bulk and at Graphite and Gold Electrodes

Electrolytes for Lithium Batteries: The Quest for Improving Lithium Battery Performance and Safety

Assessing the Ion Transport Properties of Highly Concentrated Non‐Flammable Electrolytes in a Commercial Li‐Ion Battery Cell

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