Physicochemical properties of pentaglyme–sodium bis(trifluoromethanesulfonyl)amide solvate ionic liquid

Terada, Shoshi; Mandai, Toshihiko; Nozawa, Risa; Yoshida, Kazuki; Ueno, Kazuhide; Tsuzuki, Seiji; Dokko, Kaoru; Watanabe, Masayoshi

doi:10.1039/c4cp00746h

Cited by 63 publications

(94 citation statements)

References 53 publications

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“…Here, we show examples of battery applications of Na‐based SILs. The [Na metal|[Na(G5)][TFSA]|Na 0.44 MnO 2 (SMO)] cell showed stable and reversible charge−discharge behavior at 60 °C, as shown in Figure a . This result indicates Na + ions are reversibly extracted/inserted from/into the MnO 2 framework.…”

Section: Structure and Properties Of Na K And Mg‐based Silsmentioning

confidence: 95%

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Solvate Ionic Liquids for Li, Na, K, and Mg Batteries

Mandai

Dokko

Watanabe

2018

The Chemical Record

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From the viewpoint of element strategy, non‐Li batteries with promising negative and positive electrodes have been widely studied to support a sustainable society. To develop non‐Li batteries having high energy density, research on electrolyte materials is pivotal. Solvate ionic liquids (SILs) are an emerging class of electrolytes possessing somewhat superior properties for battery applications compared to conventional ionic liquid electrolytes. In this account, we describe our recent efforts regarding SIL‐based electrolytes for Li, Na, K, and Mg batteries with respect to structural, physicochemical, and electrochemical characteristics. Systematic studies based on crystallography and Raman spectroscopy combined with thermal/electrochemical stability analysis showed that the balance of competitive cation−anion and cation−solvent interactions predominates the stability of the solvate cations. We also demonstrated battery applications of SILs as electrolytes for non‐Li batteries, particularly for Na batteries.

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Section: Structure and Properties Of Na K And Mg‐based Silsmentioning

confidence: 95%

“…In addition to Li‐based SILs, non‐Li‐based SILs also show sufficient high thermal stabilities, negligible volatility, and non‐flammability with acceptable ionic conductivity ,. The electrochemical stabilities are also effectively enhanced upon complexation of glymes with metal ions.…”

Section: Introductionmentioning

confidence: 99%

Solvate Ionic Liquids for Li, Na, K, and Mg Batteries

Mandai

Dokko

Watanabe

2018

The Chemical Record

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“…The use of glyme for the realization of “solvate ILs,” proposed for lithium system [ 117,118 ] has been also investigated for SIBs. Terada et al [ 119 ] investigated the physicochemical properties of tetraethylene glycol dimethyl ether (tetraglyme/TEGDME) and NaTFSI mixtures. The authors revealed the formation of a “solvate ILs” in which [Na(tetraglyme)] + cationic charge carriers are formed for equimolar ratio of NaTFSI:tetraglyme.…”

Section: Electrolytes For Na‐based Rechargeable Batteriesmentioning

confidence: 99%

Electrolytes and Interphases in Sodium‐Based Rechargeable Batteries: Recent Advances and Perspectives

Eshetu

Elia

Armand

et al. 2020

Advanced Energy Materials

294

258

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technologies. Unlike lithium, whose market is already very tight, sodium mineral deposits are almost infinite, evenly distributed worldwide, much easier to extract and thereby attainable at low cost. [1][2][3][4] If the realization of Na-rechargeable batteries could be practically possible, there will be nearly three orders of magnitude relaxation in the constraints on lithium-based resources, accompanied by sustainability, improved environmental benevolence, and cost reduction ( Table 1). Even more appealing is the possible use of the widely available and lighter aluminum, rather than copper, as negative current collector and hard carbon from renewable sources instead of graphite for the negative electrode. Finally, the stability of sodium-ion batteries (SIBs) in the fully discharged state would significantly enhance the safety associated with the shipment of large-format SIBs worldwide.These beneficial features of sodiumbased cells revived the research work on Na-based rechargeable batteries and accordingly captured the attention of both the academic research and industry sectors. However, similar to LIB, most of the research work in Na-based batteries have focused on the development and elaboration of negative and positive For sodium (Na)-rechargeable batteries to compete, and go beyond the currently prevailing Li-ion technologies, mastering the chemistry and accompanying phenomena is of supreme importance. Among the crucial components of the battery system, the electrolyte, which bridges the highly polarized positive and negative electrode materials, is arguably the most critical and indispensable of all. The electrolyte dictates the interfacial chemistry of the battery and the overall performance, having an influence over the practical capacity, rate capability (power), chemical/thermal stress (safety), and lifetime. In-depth knowledge of electrolyte properties provides invaluable information to improve the design, assembly, and operation of the battery. Thus, the full-scale appraisal of both tailored electrolytes and the concomitant interphases generated at the electrodes need to be prioritized. The deployment of large-format Na-based rechargeable batteries also necessitates systematic evaluation and detailed appraisal of the safety-related hazards of Na-based batteries. Hence, this review presents a comprehensive account of the progress, status, and prospect of various Na + -ion electrolytes, including solvents, salts and additives, their interphases and potential hazards.

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“…It was observed that a weak Lewis‐acidic cation, such as the lithium–glyme complex, and a weak Lewis‐basic anion leads to ionic dissociation. They have also studied an equimolar mixture of pentaglyme (G5) and Na[NTf 2 ] in which the high ionicity suggested the solvate IL dissociates into the separate sodium glyme complex [Na(G5)] + cation and [NTf 2 ] − anion, despite the extremely high salt concentration in the liquid . Kar et al .…”

Section: Introductionmentioning

confidence: 99%

“…They have also studied an equimolar mixture of pentaglyme (G5) and Na[NTf 2 ]i n which the high ionicity suggested the solvate IL dissociates into the separates odium glyme complex [Na(G5)] + cation and [NTf 2 ] À anion, despite the extremely high salt concentration in the liquid. [26] Kar et al [27][28] made as imilar observation where an ovel quaternary alkoxy bis(trifluoromethylsulfonyl)amide [NTf 2 ]b ased IL with multiple oligo-ether side chains was demonstrated to interact and successfully solubilise zinc ions in an electrolyte proposed for aZn-air battery system.…”

Section: Introductionmentioning

confidence: 99%

Ion Dynamics in a Mixed‐Cation Alkoxy‐Ammonium Ionic Liquid Electrolyte for Sodium Device Applications

et al. 2016

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The ion dynamics in a novel sodium-containing room-temperature ionic liquid (IL) consisting of an ether-functionalised quaternary ammonium cation and bis(trifluoromethylsulfonyl)amide [NTf ] anion with various concentrations of Na[NTf ] have been characterised using differential scanning calorimetry, impedance spectroscopy, diffusometry and NMR relaxation measurements. The IL studied has been specifically designed to dissolve a relatively large concentration of Na[NTf ] salt (over 2 mol kg ) as this has been shown to improve ion transport and conductivity. Consistent with other studies, the measured ionic conductivity and diffusion coefficients show that the overall ionic mobility decreases with decreasing temperature and increasing salt content. NMR relaxation measurements provide evidence for correlated dynamics between the ether-functionalised ammonium and Na cations, possibly with the latter species acting as cross-links between multiple ammonium cations. Finally, preliminary cyclic voltammetry experiments show that this IL can undergo stable electrochemical cycling and could therefore be potentially useful as an electrolyte in a Na-based device.

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Physicochemical properties of pentaglyme–sodium bis(trifluoromethanesulfonyl)amide solvate ionic liquid

Cited by 63 publications

References 53 publications

Solvate Ionic Liquids for Li, Na, K, and Mg Batteries

Solvate Ionic Liquids for Li, Na, K, and Mg Batteries

Electrolytes and Interphases in Sodium‐Based Rechargeable Batteries: Recent Advances and Perspectives

Ion Dynamics in a Mixed‐Cation Alkoxy‐Ammonium Ionic Liquid Electrolyte for Sodium Device Applications

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