1. Stability of Ionic Liquids against Sodium Metal: A Comparative Study of 1-Ethyl-3-methylimidazolium Ionic Liquids with Bis(fluorosulfonyl)amide and Bis(trifluoromethylsulfonyl)amide
- Author
-
Takafumi Hosokawa, Toshiyuki Nohira, Koji Nitta, Kazuhiko Matsumoto, Shoichiro Sakai, Atsushi Fukunaga, and Rika Hagiwara
- Subjects
Inorganic chemistry ,Ionic bonding ,02 engineering and technology ,Electrolyte ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Dielectric spectroscopy ,Metal ,chemistry.chemical_compound ,General Energy ,chemistry ,Amide ,visual_art ,Ionic liquid ,visual_art.visual_art_medium ,Physical and Theoretical Chemistry ,Cyclic voltammetry ,0210 nano-technology ,Dissolution - Abstract
The stability of [C2C1im][FSA] (C2C1im+: 1-ethyl-3-methylimidazolium; FSA–: bis(fluorosulfonyl)amide) and [C2C1im][TFSA] (TFSA–: bis(trifluoromethylsulfonyl)amide) ionic liquids against Na metal has been investigated in view of their application as electrolytes for Na secondary batteries. Cyclic voltammetry revealed that Na metal electrodeposition/dissolution reactions occur in Na[FSA]–[C2C1im][FSA], whereas these processes do not occur in Na[TFSA]–[C2C1im][TFSA]. Both visual and spectroscopic changes were observed for Na[TFSA]–[C2C1im][TFSA] after immersion of Na metal for 4 weeks, but no changes were observed for Na[FSA]–[C2C1im][FSA]. X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy indicated that there were differences in the thickness of the surface films on Na metal immersed in these ionic liquids. The presence of Na+ also affects the thickness of the surface film, and the nature of the surface films determines the difference in the stability of Na metal in these two ionic...
- Published
- 2016
- Full Text
- View/download PDF