Highly Safe Ionic Liquid Electrolytes for Sodium Ion Battery: Wide Electrochemical Window and Good Thermal Stability.
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 x 10( 3) S cm( 1) at 20 degC. 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.
ACS applied materials interfaces