Fig. 5: Li/Cu and Li/Li symmetric cell performance.

a–c Voltage profile of an Aurbach test using a Gen 2, b (PMpyrf)0.8Li0.2FSI, and c (PMpyrf)0.5Li0.5FSI. d Coulombic efficiency of Li/Cu cell cycled with current density of 0.1 mA/cm2. e Voltage profile of Li/Li symmetric cell with current density of 0.5 mA/cm2.