Physical properties and compatibility with graphite and lithium metal anodes of non-flammable deep eutectic solvent as a safe electrolyte for high temperature Li-ion batteries

Chidiac, Joseph; Timperman, Laure; Anouti, Mérièm

doi:10.1016/j.electacta.2022.139944

Cited by 19 publications

(15 citation statements)

References 74 publications

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“…To our knowledge, there is one study that describes an eutectic mixture of an imide salt (LiTFSI) with EC for battery applications (i. e., Li metal studies). [11] We recently reported our findings on this eutectic mixture [12] on Li metal and graphite in half-cells showing good thermal stability (C/10 rate up to 80 °C), long cycling (5 months), minimal capacity fade (0.4 mAh g À 1 per cycle for 100 cycles) and most importantly non-flammable behaviour. [12] The formation of efficient coordination bonds of the molecules of polar solvents with the Li + cations effectively stabilizes the free doublets of the solvent and marginalizes their sensitivity to oxidation.…”

Section: Introductionmentioning

confidence: 84%

“…[11] We recently reported our findings on this eutectic mixture [12] on Li metal and graphite in half-cells showing good thermal stability (C/10 rate up to 80 °C), long cycling (5 months), minimal capacity fade (0.4 mAh g À 1 per cycle for 100 cycles) and most importantly non-flammable behaviour. [12] The formation of efficient coordination bonds of the molecules of polar solvents with the Li + cations effectively stabilizes the free doublets of the solvent and marginalizes their sensitivity to oxidation. When less than 5 % of the solvent is free and does not participate in the coordination of Li + , the volatility of the electrolyte is markedly reduced, leading to low cell overpressure and electrolyte flammability.…”

Section: Introductionmentioning

confidence: 84%

“…Table 2 summarizes the thermodynamic characteristics, including the eutectic composition (x e , T e ) and depth (DT) of the Na-imides salt-based mixtures against a Li analog, i. e., EC/LiFTFSI. [12] The eutectic depth corresponds to the difference between an ideal behavior (depicted by the purple line in Figures 1c and 1 d) and the actual mixture obtained. Here, it lies between 90 and 105 °C.…”

Section: Thermal Characterization and Eutectic Diagrammentioning

confidence: 99%

“…The eutectic point for the EC/NaTFSICN solution lies at 0.2, for the EC/NaTFSI mixture at 0.14, while for EC/LiTFSI it reaches 0.4. [12] The lower eutectic point of Na-based DESs indicates that the size, charge density, and polarizability of the Na + cation induce less interaction with anions, rendering the formation of the EC-anion complex facile. Table 2 summarizes the thermodynamic characteristics, including the eutectic composition (x e , T e ) and depth (DT) of the Na-imides salt-based mixtures against a Li analog, i. e., EC/LiFTFSI.…”

Section: Thermal Characterization and Eutectic Diagrammentioning

confidence: 99%

“…EC/NaFTFSI EC/NaTFSICN EC/LiFTFSI [12] T m salt The LiTFSI/EC plots are used for comparison purposes and taken from. [12] a ¼ À…”

Section: Eutecticmentioning

confidence: 99%

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Non‐Flammable Sodium Asymmetric Imide Salt‐Based Deep Eutectic Solvent for Supercapacitor Applications

et al. 2022

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This study reports two deep eutectic solvents (DESs) based on alkaline imide salts with asymmetric anions as functional electrolytes for supercapacitor (SC) application. The eutectic mixture of sodium (fluorosulfonyl) (trifluoromethanesulfonyl) imide (NaFTFSI) or sodium cyano-trifluoromethanesulfonyl imide (NaTFSICN) with ethylene carbonate (EC) delivers a nonflammable and stable liquid. The eutectic diagrams of the electrolytes directed to an optimal composition (w salt = 0.25), hinging to that of conventional carbonate-based electrolytes, i. e., 1 mol L À 1 . The volumetric properties of the DESs revealed a "stacking" effect, reflecting a strong coordination bond between the imide and EC anions without solvating the Na + cations. The DES transport properties (i. e., viscosity, conductivity, and ionicity) and temperature variations designate a high organization, similar to ionic liquids. The DESs, when coupled with activated carbon electrodes in a two-electrode symmetric configuration, yield specific capacities of 150 F g À 1 at a normalized current density of 0.5 A g À 1 (and 120 F g À 1 at 2 A g À 1 ). The SC maintained 80 % of its initial capacity beyond 100 h of floating at an operating voltage of 2.4 V and showed a 150 mV per hour potential loss under self-discharge. The devised eutectic mixtures offer a promising new pathway for simple, safe, and effective electrolytes for SC applications.

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Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 84%

Section: Thermal Characterization and Eutectic Diagrammentioning

confidence: 99%

Section: Thermal Characterization and Eutectic Diagrammentioning

confidence: 99%

“…EC/NaFTFSI EC/NaTFSICN EC/LiFTFSI [12] T m salt The LiTFSI/EC plots are used for comparison purposes and taken from. [12] a ¼ À…”

Section: Eutecticmentioning

confidence: 99%

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Non‐Flammable Sodium Asymmetric Imide Salt‐Based Deep Eutectic Solvent for Supercapacitor Applications

et al. 2022

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Designer Anions for Better Rechargeable Lithium Batteries and Beyond

Song,

Wang,

Feng

et al. 2024

Advanced Materials

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Non‐aqueous electrolytes, generally consisting of metal salts and solvating media, are indispensable elements for building rechargeable batteries. As the major sources of ionic charges, the intrinsic characters of salt anions are of particular importance in determining the fundamental properties of bulk electrolyte, as well as the features of the resulting electrode‐electrolyte interphases/interfaces. To cope with the increasing demand for better rechargeable batteries requested by emerging application domains, the structural design and modifications of salt anions are highly desired. Here, salt anions for lithium and other monovalent (e.g., sodium and potassium) and multivalent (e.g., magnesium, calcium, zinc, and aluminum) rechargeable batteries are outlined. Fundamental considerations on the design of salt anions are provided, particularly involving specific requirements imposed by different cell chemistries. Historical evolution and possible synthetic methodologies for metal salts with representative salt anions are reviewed. Recent advances in tailoring the anionic structures for rechargeable batteries are scrutinized, and due attention is paid to the paradigm shift from liquid to solid electrolytes, from intercalation to conversion/alloying‐type electrodes, from lithium to other kinds of rechargeable batteries. The remaining challenges and key research directions in the development of robust salt anions are also discussed.This article is protected by copyright. All rights reserved

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Carbon based manganese oxide (MnO2, MnO2/MWCNT and MnO2/rGO) composite electrodes for high-stability Li-ion batteries

Rosaiah,

Divya,

Sambasivam

et al. 2023

Carbon Lett.

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Physical properties and compatibility with graphite and lithium metal anodes of non-flammable deep eutectic solvent as a safe electrolyte for high temperature Li-ion batteries

Cited by 19 publications

References 74 publications

Non‐Flammable Sodium Asymmetric Imide Salt‐Based Deep Eutectic Solvent for Supercapacitor Applications

Non‐Flammable Sodium Asymmetric Imide Salt‐Based Deep Eutectic Solvent for Supercapacitor Applications

Designer Anions for Better Rechargeable Lithium Batteries and Beyond

Carbon based manganese oxide (MnO2, MnO2/MWCNT and MnO2/rGO) composite electrodes for high-stability Li-ion batteries

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