SnO₂-Based Nanomaterials: Synthesis and Application in Lithium-Ion Batteries and Supercapacitors

Figure 12

(a) Plotted curve of the variation in the specific capacitance of the SnO₂/MnO₂ composites as a function of the scan rate. (b) Specific capacitance obtained at different scan rates at 3, 27, and 55°C. (c) Curve showing long-term stability as a function of the cycle number tested by constant current charge/discharge method (current density of 20 A g⁻¹), which was carried out continuously at °C (ice water bath) and then at 27°C (room temperature) and finally at °C (water bath). The inset shows the first cycle of charge/discharge curves at different temperatures at a high current density of 20 A g⁻¹ adapted from [90] with permission.

(a)

(b)

(c)