Liquid Electrolytes Based on Ionic Liquids for Lithium-Ion Batteries

Le, My Loan Phung; Tran, Ngan; Ngo, Hoang Phuong Khanh; Nguyen, Truong Giang; Tran, Van Man

doi:10.1007/s10953-015-0408-z

Cited by 19 publications

(15 citation statements)

References 11 publications

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“…For the ionic liquids with this cation, the samples with the [FSI] − anion show slightly lower melting points, but higher crystallization temperatures than the [TFSI] − analogues. The values for the melting point and solid-solid transition of the pure [N1114][TFSI] are in good agreement with literature reports [31]. Elongation of the alkyl side chain from butyl to pentyl leads to an increase in the crystallization and melting points of roughly 10 • C. As a consequence, [N1115][TFSI] is the only sample with purely alkyl side chains, that is not a room temperature ionic liquid.…”

Section: Ionic Liquidsupporting

confidence: 89%

Structure-Property Relation of Trimethyl Ammonium Ionic Liquids for Battery Applications

et al. 2021

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Ionic liquids are attractive and safe electrolytes for diverse electrochemical applications such as advanced rechargeable batteries with high energy densities. Their properties that are beneficial for energy storage and conversion include negligible vapor-pressure, intrinsic conductivity as well as high stability. To explore the suitability of a series of ionic liquids with small ammonium cations for potential battery applications, we investigated their thermal and transport properties. We studied the influence of the symmetrical imide-type anions bis(trifluoromethanesulfonyl)imide ([TFSI]−) and bis(fluorosulfonyl)imide ([FSI]−), side chain length and functionalization, as well as lithium salt content on the properties of the electrolytes. Many of the samples are liquid at ambient temperature, but their solidification temperatures show disparate behavior. The transport properties showed clear trends: the dynamics are accelerated for samples with the [FSI]− anion, shorter side chains, ether functionalization and lower amounts of lithium salts. Detailed insight was obtained from the diffusion coefficients of the different ions in the electrolytes, which revealed the formation of aggregates of lithium cations coordinated by anions. The ionic liquid electrolytes exhibit sufficient stability in NMC/Li half-cells at elevated temperatures with small current rates without the need of additional liquid electrolytes, although Li-plating was observed. Electrolytes containing [TFSI]− anions showed superior stability compared to those with [FSI]− anions in battery tests.

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Section: Ionic Liquidsupporting

confidence: 89%

Structure-Property Relation of Trimethyl Ammonium Ionic Liquids for Battery Applications

et al. 2021

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“…As soon as Li-TFSA is added to an EMIM-TFSA/EC mixture, the conductivity values of the mixture usually decrease significantly ( Figure 9 f). This is in accordance with pyrrolidinium-TFSA/Li-TFSA mixtures in liquid state studied by Martinelli et al [ 34 ] and IL/EC + Li-TFSA mixtures mentioned by Le et al [ 47 ]. With increasing Li-TFSA content, the maximum value of the conductivity with respect to the EMIM-TFSA/EC ratio is measured in mixtures with higher EC amounts.…”

Section: Resultssupporting

confidence: 92%

Investigation of Ternary Mixtures Containing 1-Ethyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)azanide, Ethylene Carbonate and Lithium Bis(trifluoromethanesulfonyl)azanide

Hofmann

Migeot

Arens

et al. 2016

IJMS

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Temperature-dependent viscosity, conductivity and density data of ternary mixtures containing 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)azanide (EMIM-TFSA), ethylene carbonate (EC), and lithium bis(trifluoromethanesulfonyl)azanide (Li-TFSA) were determined at atmospheric pressure in the temperature range of 20 to 80 °C. Differential scanning calorimetry (DSC) measurements were performed to characterize phase conditions of the mixtures in a temperature range of −120 to +100 °C. The viscosity data were fitted according to the Vogel-Fulcher-Tammann-Hesse (VFTH) equation and analyzed with the help of the fractional Walden rule. In this study, fundamental physicochemical data about the mixtures are provided and discussed as a basis for structure-property relationship calculations and for potential use of those mixtures as electrolytes for various applications.

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“…When the temperature was increased from 20 to 80 °C, the viscosity of DEMEFTFSI decreased from 64.1 to 10.4 MPa s whereas that of DEMEFSI changed from 59.8 to 10.8 MPa s. Furthermore, the introduction of an ether function on the cation improves chain flexibility and lowers the viscosity . Indeed, the viscosity of DEMETFSI (95.9 MPa s at 20 °C) was almost half that of the alkyl‐ammonium analogue (N 1224 TFSI, 160.7 MPa s at 20 °C), resulting from the improved fluidity induced by the flexible ether function.…”

Section: Resultsmentioning

confidence: 99%

Concentrated Ionic‐Liquid‐Based Electrolytes for High‐Voltage Lithium Batteries with Improved Performance at Room Temperature

Gao

Mariani

et al. 2019

ChemSusChem

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Ionic liquids (ILs) have been widely explored as alternative electrolytes to combat the safety issues associated with conventional organic electrolytes. However, hindered by their relatively high viscosity, the electrochemical performances of IL‐based cells are generally assessed at medium‐to‐high temperature and limited cycling rate. A suitable combination of alkoxy‐functionalized cations with asymmetric imide anions can effectively lower the lattice energy and improve the fluidity of the IL material. The Li/Li1.2Ni0.2Mn0.6O2 cell employing N‐N‐diethyl‐N‐methyl‐N‐(2‐methoxyethyl)ammonium (fluorosulfonyl)(trifluoromethanesulfonyl)imide (DEMEFTFSI)‐based electrolyte delivered an initial capacity of 153 mAh g−1 within the voltage range of 2.5–4.6 V, with a capacity retention of 65.5 % after 500 cycles and stable coulombic efficiencies exceeding 99.5 %. Moreover, preliminary battery tests demonstrated that the drawbacks in terms of rate capability could be improved by using Li‐concentrated IL‐based electrolytes. The improved room‐temperature rate performance of these electrolytes was likely owing to the formation of Li+‐containing aggregate species, changing the concentration‐dependent Li‐ion transport mechanism.

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Liquid Electrolytes Based on Ionic Liquids for Lithium-Ion Batteries

Cited by 19 publications

References 11 publications

Structure-Property Relation of Trimethyl Ammonium Ionic Liquids for Battery Applications

Structure-Property Relation of Trimethyl Ammonium Ionic Liquids for Battery Applications

Investigation of Ternary Mixtures Containing 1-Ethyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)azanide, Ethylene Carbonate and Lithium Bis(trifluoromethanesulfonyl)azanide

Concentrated Ionic‐Liquid‐Based Electrolytes for High‐Voltage Lithium Batteries with Improved Performance at Room Temperature

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