Highly Safe Ionic Liquid Electrolytes for Sodium-Ion Battery: Wide Electrochemical Window and Good Thermal Stability

Feng Wu; Na Zhu; Ying Bai; Libin Liu; Hang Zhou; Chuan Wu

doi:10.1021/acsami.6b07054

Highly Safe Ionic Liquid Electrolytes for Sodium-Ion Battery: Wide Electrochemical Window and Good Thermal Stability

ACS Appl Mater Interfaces. 2016 Aug 24;8(33):21381-6. doi: 10.1021/acsami.6b07054. Epub 2016 Aug 9.

Authors

Feng Wu^{1

2}, Na Zhu¹, Ying Bai¹, Libin Liu¹, Hang Zhou¹, Chuan Wu^{1

2}

Affiliations

¹ 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.
² Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, People's Republic of China.

PMID: 27454818
DOI: 10.1021/acsami.6b07054

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.

Keywords: NaBF4; electrolyte; ionic liquid; quantum chemical theoretical calculation; sodium-ion battery.