Fig. 7. (a) Voltage profiles of the lithium plating/striping cycling of symmetrical Li/Li cells with Celgard 2325 separator, PVDF-HFP and PVDF-HFP-PEO-SiO2 GPEs at a current density of 0.1 mA cm−2. (b) Voltage profiles of the lithium plating/striping cycling of PVDF-HFP-PEO-SiO2 GPE at a current density of 0.2 mA cm−2. SEM images of (c) Li metal before cycling, (d) Li metal of Li/Celgard 2325 separator/Li cell after 500 h cycles, (e) Li metal of Li/PVDF-HFP GPE/Li cell after 310 h cycles, and (f) Li metal of Li/PVDF-HFP-PEO-SiO2 GPE/Li cell after 1000 h cycles at a current density of 0.1 mA cm−2.
