2024/3/1/ · The coated carbon aluminum foil was then sliced into 14 mm-diameter discs. In an argon-filled glove box with O 2 and H 2 O concentrations less than 0.1 ppm, the coin cells were put together. The lithium metal foil served as the counter electrode, Celgard 2400 as the separator, and El-Gr as the electrolyte (1.0 M LiPF6 in EC: DMC: EMC=1:1:1,