Raman Spectroscopic Study on Alkaline Metal Ion Solvation in 1-Butyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)amide Ionic Liquid

Umebayashi, Yasuhiro; Yamaguchi, Toshio; Fukuda, Sho; Mitsugi, Takushi; Takeuchi, Munetaka; Fujii, Kenta; Ishiguro, Shin‐ichi

doi:10.2116/analsci.24.1297

Cited by 40 publications

(36 citation statements)

References 82 publications

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“…It is well known that TFSA – anions serve as bidentate ligands for metal ions using oxygen atom in sulfonyl group. Seminal studies, based on Raman spectroscopy and molecular dynamic (MD) simulations, have indeed revealed that the number of solvated TFSA – anions are 2 for Li + , and 3 for both Na + and K + . In Pyr 13 TFSA, however, there is a significant difference in the viscosity and ionic conductivity between 0.5 M KTFSA/Pyr 13 TFSA and 0.5 M NaTFSA/Pyr 13 TFSA, albeit the number of solvated TFSA – anions are the same.…”

Section: Resultsmentioning

confidence: 99%

“…Seminal studies, based on Raman spectroscopy and molecular dynamic (MD) simulations, have indeed revealed that the number of solvated TFSAanions are 2 for Li + , and 3 for both Na + and K + . [27] In Pyr 13 TFSA, however, there is a significant difference in the viscosity and ionic conductivity between 0.5 M KTFSA/Pyr 13 TFSA and 0.5 M NaTFSA/Pyr 13 TFSA, albeit the number of solvated TFSAanions are the same. These results can be rationalized to arise from the difference in the ionic radii of Na (102 pm) and K (138 pm), [28] in addition to the Lewis acidity which determine the solvation structure.…”

Section: Physicochemical and Electrochemical Properties Of Potassium mentioning

confidence: 96%

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Sulfonylamide‐Based Ionic Liquids for High‐Voltage Potassium‐Ion Batteries with Honeycomb Layered Cathode Oxides

et al. 2019

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The world is at the cusp of a new era where pivotal importance is being attached to the development of sustainable and high‐performance energy storage systems. Potassium‐ion batteries are deemed not only cheap battery candidates, but also as the penultimate high‐voltage energy storage systems within monovalent‐cation chemistries. However, their performance and sustainability are undermined by the lack of suitable electrolytes for high‐voltage operation, particularly owing to the limited availability of cathode materials. Here, the potential of ionic liquids based on potassium bis(trifluoromethanesulfonyl)amide (KTFSA) as high‐voltage electrolytes is presented by assessing their physicochemical properties along with the electrochemical properties upon coupling with new high‐voltage layered cathode materials. These ionic liquids demonstrate a wide electrochemical window (around 6.0 V), making them feasible and safe electrolytes for the high‐voltage potassium‐ion battery configuration. This is proven by matching this electrolyte with new high‐voltage layered cathode compositions, demonstrating stable electrochemical performance. The present findings of electrochemically stable ionic liquids based on potassium bis(trifluoromethanesulfonyl)amide will bolster further advancement of high‐performance cathode materials, whose performance at high‐voltage regimes were apparently restricted by the paucity of suitable and compatible electrolytes.

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Section: Resultsmentioning

confidence: 99%

Section: Physicochemical and Electrochemical Properties Of Potassium mentioning

confidence: 96%

Sulfonylamide‐Based Ionic Liquids for High‐Voltage Potassium‐Ion Batteries with Honeycomb Layered Cathode Oxides

et al. 2019

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“…More importantly, high concentrated electrolytes have an unusual solvation structure compared to conventional low concentration electrolytes. Shirai et al (2008) (Umebayashi et al, 2008). After that, Yamada et al reported that the performance of 3.6 mol/L electrolyte consisted of dual (fluorosulfonyl) lithium amide (LiFSA) and DME was much higher than that of commercial electrolytes under ultrafast charge.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Concentration of Lithium Salt on the Structural and Transport Properties of Ionic Liquid-Based Electrolytes

Tong

Solms

et al. 2020

Front. Chem.

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Ionic liquids (ILs) are used as electrolytes in high-performance lithium-ion batteries, which can effectively improve battery safety and energy storage capacity. All atom molecular dynamics simulation and experiment were combined to investigate the effect of the concentration of lithium salt on the performance of electrolytes of four IL solvents ([C n mim][TFSI] and [C n mim][FSI], n = 2, 4). The IL electrolytes exhibit higher density and viscosity; meanwhile, larger lithium ion transfer numbers as the concentration of LiTFSI increases. Furthermore, in order to explore the effect of the concentration of lithium salt on the ionic associations of Li + and anion of IL, the microstructures of the lithium salt in various IL electrolytes at different concentrations were investigated. The structural analysis indicated that strong bidentate and monodentate coordination was found between Li + and anion of all IL electrolytes. Both cis and trans isomerism of [FSI] − were observed in [FSI] −-type IL electrolyte systems. Furthermore, the existence of the ion cluster [Li[anion] x ] (x−1)− in IL electrolytes and the cluster became more closed and compact as the concentration of LiTFSI increases.

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“…But the actual conductivities of common ILs are comparable to the highest nonaqueous solvent/electrolyte systems ($10 mS cm À1 ), and they are much smaller than those of concentrated aqueous electrolyte solutions. [35] showed that the numbers of NTf 2 À bound to Li þ , Na þ , K þ and Cs þ are 1.95, 2.88, 3.2 and 3.9, respectively. Some of the conductivity (k) and molar conductivity (L) data are also shown in Table 13.3.…”

Section: Ionic Liquidsmentioning

confidence: 99%

Electrochemistry in Clean Solvents

Izutsu¹

2009

Electrochemistry in Nonaqueous Solutions

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Raman Spectroscopic Study on Alkaline Metal Ion Solvation in 1-Butyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)amide Ionic Liquid

Cited by 40 publications

References 82 publications

Sulfonylamide‐Based Ionic Liquids for High‐Voltage Potassium‐Ion Batteries with Honeycomb Layered Cathode Oxides

Sulfonylamide‐Based Ionic Liquids for High‐Voltage Potassium‐Ion Batteries with Honeycomb Layered Cathode Oxides

The Effect of Concentration of Lithium Salt on the Structural and Transport Properties of Ionic Liquid-Based Electrolytes

Electrochemistry in Clean Solvents

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