title: Highly Safe Ionic Liquid Electrolytes for Sodium-Ion Battery: Wide Electrochemical Window and Good Thermal Stability.
abstract: Novel ionic liquid (IL) electrolytes are prepared by mixing 1-ethyl-3-methylimidazolium-bis-tetrafluoroborate (EMIBF4) with different concentrations of sodium salt (NaBF4). The as-prepared IL electrolytes display wide electrochemical windows of ∼4 V (1-5 V), which are consistent with the quantum chemical theoretical calculation. The IL electrolyte with 0.1 M NaBF4 shows excellent ionic conductivity, namely, 9.833 × 10(-3) S cm(-1) at 20 °C. In addition, nonflammability and good thermal stability are exhibited by combustion test and thermogravimetric analysis (TGA), which indicate the high safety of the IL electrolyte.
authors.affiliation: Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology , Beijing 100081, People's Republic of China.|Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, People's Republic of China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wu
authors.affiliation: Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology , Beijing 100081, People's Republic of China.
authors.forename: Na
authors.initials: N
authors.lastname: Zhu
authors.affiliation: Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology , Beijing 100081, People's Republic of China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Bai
authors.affiliation: Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology , Beijing 100081, People's Republic of China.
authors.forename: Libin
authors.initials: L
authors.lastname: Liu
authors.affiliation: Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology , Beijing 100081, People's Republic of China.
authors.forename: Hang
authors.initials: H
authors.lastname: Zhou
authors.affiliation: Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology , Beijing 100081, People's Republic of China.|Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, People's Republic of China.
authors.forename: Chuan
authors.initials: C
authors.lastname: Wu
keywords: NaBF4; electrolyte; ionic liquid; quantum chemical theoretical calculation; sodium-ion battery