Lithium Borate Ionic Liquids as Single?Component Electrolytes for Batteries

Current electrolytes for lithium batteries are usually composed of at least two chemical compounds, an organic solvent such as a cyclic carbonate and salt LiPF6. Here, the concept using single-component electrolyte is demonstrated in based on new borate ionic liquids room temperature. The design this class (LiILs) asymmetrically substituted central tetracoordinate boron atom with oligoethylene glycol groups, fluorinated electron-attracting one alkane group. optimized borate?Li+ LiILs show high conductivity value >10?4 S cm?1 25 °C, transference numbers ( t L i + ${t_{L{i^{\bm{ }}}}}$ = 0.4 – 0.5) electrochemical stability (>4 V). Some present compatibility lithium-metal electrodes showing stable polarization profiles platting/stripping tests. selected LiIL investigated battery cells discharge capacity values Li0/LiIL/lithium–iron phosphate Li0/LiIL/lithium titanate 124 75 mAh g?1, respectively, C-rate 0.2 C 65 °C low-capacity loss.