2025-04-18 京都大学
＜関連情報＞
- https://www.kyoto-u.ac.jp/ja/research-news/2025-04-18-3
- https://www.kyoto-u.ac.jp/sites/default/files/2025-04/web_2504_Wakamiya-4c75af5cb710e2a233fb4195f058df11.pdf
- https://onlinelibrary.wiley.com/doi/10.1002/anie.202422299
室温フッ化物イオン電池用テーラード3-アルコキシ-N,N,N,2,2-ペンタメチルプロパン-1-アンモニウムビス（トリフルオロメチルスルホニル）イミドイオン液体 Tailored 3-Alkoxy-N,N,N,2,2-Pentamethylpropan-1-Ammonium Bis(trifluoromethylsulfonyl)Imide Ionic Liquids for Room-Temperature Fluoride-Ion Batteries
Tiancheng Tan, Richard Murdey, Shunsuke Sumitomo, Kazuyuki Sato, Takeshi Abe, Atsushi Wakamiya
Angewandte Chemie International Edition Published: 07 April 2025
DOI:https://doi.org/10.1002/anie.202422299
Graphical Abstract
Two new quaternary ammonium TFSI ionic liquids, [MNPA][TFSI] and [NPPA][TFSI] were designed and synthesized. These ionic liquids readily dissolve quaternary ammonium fluorides (>0.7 M), and the resulting electrolytes have a wide operational voltage range (>5.4 V). Battery performance using Np2F/[MNPA][TFSI] demonstrated stable and reversible (de)fluorination reaction, with stable fluoride ion shuttling for 100 h.
Abstract
Two novel liquid electrolytes for room-temperature fluoride ion batteries are presented. These electrolytes are based on ionic liquids with quaternary ammonium cations 3-methoxy-N,N,N,2,2-pentamethylpropan-1-aminium (MNPA) and N,N,N,2,2-pentamethyl-3-(2,2,2-trifluoroethoxy)propane-1-aminium (NPPA) combined with a bis(trifluoromethylsulfonyl)-imide (TFSI) counterion. Quaternary ammonium fluorides can be added at concentrations up to 0.7 M to a functional fluoride electrolyte with a total diffusivity of 4.99 × 10−12 m2 s−1, a viscosity of 260 mP⋅s and a wide operational voltage range exceeding 5.4 V. The liquid ion electrolyte with the MNPA cation supports stable fluoride ion shuttling for up to 100 h.
