fig12

Figure 12. (A) Charge and discharge curves of VN-rGO in the initial two cycles at 0.1 A g^-1, (B) in-situ EIS plots during the first charging process, (C) CV curve of VN-rGO material for the first three cycles at 0.1 mV s^-1, (D) the cycling performance of VN-rGO at 0.1 A g^-1, (E) comparison of the rate performance of VN-rGO microspheres and VN microspheres/rods and (F) long cycle performance. (G) comparison of energy density of VN-rGO microspheres with Ragone diagrams of other materials^[135]. Copyright 2022, Elsevier.