Fig. 4. (a) CV profiles at a scanning rate of 0.3 mV s−1, and (b) discharge−charge curves at 100 mA g−1 of TiO2/C-80.Figure optionsDownload full-size imageDownload as PowerPoint slide
Fig. 4b shows the discharge–charge curves of TiO2/C-80 for selected cycles. The voltage plateau at ~1.7 V during discharging and the one at ~2.0 V during charging Verteporfin in good accordance with the peaks in the CV profiles (Fig. 4a). The plateaus are related to a two-phase separation, i.e. the formation of Li-rich phase and Li-poor phase . During the first discharging, the capacity reaches 537.2 mA h g−1, and in the 2nd cycle, the capacity drops to 301.1 mA h g−1. The irreversible capacity loss is attributed to the formation of SEI films on the surface of electrode materials. The CV profiles and discharge–charge curves of the other TiO2/C nanocomposites are similar to human chorionic gonadotropin (hCG) of TiO2/C-80, as displayed in Figs. S5 and S6 of Supporting Information.