Fig. 1: Configuration and components of quasi-solid-state rechargeable Li-O2 battery.

a Schematic illustration of a quasi-solid-state rechargeable Li-O2 battery. SEM images of (b) porous graphene cathode and (c) porous graphene/Li anode. Insets show the photographic images. d Optical photograph of GPE-TTF. e, f SEM images of GPE-TTF with different magnifications