Fig. 2. (a) Polarization voltage curves of Li‖Li symmetric cells with different electrolytes at a current density of 0.1 mA cm⁻² and a capacity of 0.1 mA h cm⁻². (b) SEM images of LM of Li‖FGPE1:1‖Li and Li‖FGPE1:2‖Li after 100 h at a current density of 0.1 mA cm⁻² with a capacity of 0.1 mA h cm⁻². (c) Cycling performance of LFP‖Li cells with different electrolytes after 100 cycles at 0.2C. (d) Cycling performance of the LFP‖FGPE1:1‖Li cell at 0.2C. (e) Charge and discharge curves of LFP‖FGPE1:1‖Li at 0.2C. (f) Rate performance of LFP‖Li cells with different electrolytes.