fig3

Figure 3. Electrochemical characterizations at both (A-G) the room temperature and (H and I) the extreme temperature (-20~60 °C) in 3.0 to 4.8 V. (A) Reversible capacity comparison of LVP@NC-x (x = 0.5, 0.8, 1, 2, 3). (B) The first three CV curves and (C) charge/discharge profiles of the LVP@NC-0.8 cathode in different cycles at 0.5 C. (D) Rate performances at the different current densities from 0.5 C to 10 C, (E) cycling performance at 0.5 C, (F) ultralong-life cycling performance at 10 C, and (G) Nyquist plots of LVP@NC-x (x = 0.5, 0.8, 1). (H) Initial charge/discharge curves and (I) cycling performances of LVP@NC-0.8 electrode at different temperatures.