Fig. 4

Electrochemical performance of the pure SnS₂ and 3D SnS₂ QDs/rGO composite electrodes for SIBs. a, b CV curves of the pure SnS₂ electrode and 3D SnS₂ QDs/rGO composite electrode at a scan rate of 0.1 mV/s for the first five cycles. c Charge/discharge curves of the pure SnS₂ composite electrode and d the 3D SnS₂ QDs/rGO composite electrode at a current density of 0.1 A/g in the voltage range of 0.01–3.0 V vs. Na⁺/Na. e Rate performance of 3D SnS₂ QDs/rGO and the pure SnS₂ composite electrode at rates ranging from 0.1 to 5 A/g. f Cycling performance of 3D SnS₂ QDs/rGO composite electrode and the pure SnS₂ electrode at a current density of 0.5 A/g. g CV curves of 3D SnS₂ QDs/rGO composite electrode at different scan rates. h Capacitive contribution at the scan rate of 1 mV/s. i Contribution ratio of the capacitive and diffusion-controlled charge vs. different scan rates