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Title: Comparative study of M[N(SO₂F)(SO₂CF₃)]–[N-butyl-N-methylpyrroridinium][N(SO₂F)(SO₂CF₃)] (M = Li, Na, K, Rb, Cs) ionic liquid electrolytes
Authors: Yamamoto, Takayuki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-3553-3272 (unconfirmed)
Nishijima, Shu
Nohira, Toshiyuki
Author's alias: 山本, 貴之
西島, 士湧
野平, 俊之
Issue Date: 24-Sep-2020
Publisher: American Chemical Society (ACS)
Journal title: The Journal of Physical Chemistry B
Volume: 124
Issue: 38
Start page: 8380
End page: 8387
Abstract: We systematically evaluated the physicochemical properties of a series of M[FTA]–[C₄C₁pyrr][FTA] ionic liquids (ILs) (M = alkali metal, FTA = (fluorosulfonyl)(trifluoromethylsulfonyl)amide, C₄C₁pyrr = N-butyl-N-methylpyrrolidinium) as electrolytes for alkali metal-ion batteries. First, the viscosity (η), ionic conductivity (σ), and density (ρ) of the M[FTA]–[C₄C₁pyrr][FTA] ILs at x(M[FTA]) = 0.20 (x(M[FTA]) = molar fraction of M[FTA]) were measured. The σ values ranged from 1–3 mS cm⁻¹ at 298 K and increased as follows: Na < Li < K < Rb < Cs, which indicated that the Li-based IL did not obey the trend predicted by the charge densities of alkali metal cations. Second, the Li-based IL exhibited slightly lower vertical intercept values than the other FTA-based ILs in the Walden plots obtained using the results of η, σ, and ρ measurements. Third, the electrochemical stability of the ILs was investigated by cyclic voltammetry, and the redox potentials of the alkali metals (E(M⁺/M)) were determined. The E(M⁺/M) values of the FTA-based ILs increased as follows: Cs < Rb < K < Li < Na. Subsequently, we compared the obtained E(M⁺/M) values with those of other general electrolytes, such as propylene carbonate (PC)-based electrolytes and aqueous solutions. The trend in E(M⁺/M) values of the FTA-based ILs was similar to that of PC-based electrolytes and was significantly different from that of aqueous solutions. In particular, the FTA- and FSA-based ILs (FSA = bis(fluorosulfonyl)amide) presented the most negative E(Na⁺/Na) and E(K⁺/K) values among various electrolytes, which indicated that utilization of these IL electrolytes for the development of Na- and K-ion batteries would present significant advantages.
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry B, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcb.0c06578.
The full-text file will be made open to the public on 2 September 2021 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/261732
DOI(Published Version): 10.1021/acs.jpcb.0c06578
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