Figure 11From: Graphene-supported SnO2 nanoparticles prepared by a solvothermal approach for an enhanced electrochemical performance in lithium-ion batteriesAC impedance spectra of the SnO 2 /GNS nanocomposite electrode (a) before cycling, (b) after 5 cycles, and (c) after 100 cycles. The inset shows the equivalent circuit model: Rs – resistance of the electrolyte; Rct – charge transfer resistance; Zw – Warburg resistance; CPE – constant phase element.Back to article page