Graphene/Sulfur@Graphene Composite Structure Material for a Lithium-Sulfur Battery Cathode

Table 1

Impedance parameters of Li-S coin cells with S, G/S, and G/S-G cathodes before discharge and after cycles.

Cathode	(Ω)	(Ω)
S (before discharge)	14.67	257.00
G/S (before discharge)	6.78	174.00
G/S-G (before discharge)	18.05	147.00
S (after the 100^th cycle)	20.24	157.00
G/S (after the 200^th cycle)	3.49	83.60
G/S-G (after the 200^th cycle)	3.99	67.20