Characterization of the Solid-Electrolyte Interphase between a Cu Electrode and LiN(CF3SO2)2-triglyme Solvate Ionic Liquid

被引:6
作者
Serizawa, Nobuyuki [1 ]
Kitta, Kazuki [1 ]
Tachikawa, Naoki [1 ]
Katayama, Yasushi [1 ]
机构
[1] Keio Univ, Fac Sci & Technol, Dept Appl Chem, Yokohama, Kanagawa 2238522, Japan
关键词
Batteries; Lithium; Molten Salts; Low Temperature Molten Salts; Electrodeposition; Energy Storage; ELECTROCHEMICAL DEPOSITION; LITHIUM; SURFACE; SALT; TEMPERATURE; DISSOLUTION; CARBONATE; BATTERIES; MECHANISM; BEHAVIOR;
D O I
10.1149/1945-7111/aba701
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The formation of the solid electrolyte interphase (SEI) on a Cu electrode was investigated in 50.0-50.0 mol% lithium bis(trifluoromethylsulfonyl)amide (LiTFSA)-triglyme (G3, CH3(OCH2CH2)(3)OCH3) solvate ionic liquid, [Li(G3)]TFSA, using electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FT-IR). The Li(+)conductive SEI was formed on a Cu electrode by keeping the potential at 0 V vs Li divide Li(I). The resistance and capacitance attributable to the SEI changed over a period of 24 h in EIS spectra, suggesting the sluggish SEI formation on the Cu electrode in [Li(G3)]TFSA. XPS and FT-IR spectra indicated the existence of G3, TFSA(-), [Li(G3)](+), and/or their decomposition products in the SEI. In contrast, LiF was not found in the SEI, suggesting LiF was not formed by the cathodic decomposition of [Li(G3)]TFSA on the Cu electrode at 0 V. The whisker-like growth of Li on a Cu electrode was suppressed after the SEI formation at 0 V probably due to the formation of homogeneous and low-conductive SEI layer. The coulombic efficiency for deposition and dissolution of Li was improved with the SEI formation at 0 V prior to the measurements, suggesting the SEI on a Cu electrode affected the reversibility of the Li anode.
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页数:6
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