“…As presented in Fig. 7, the maximum OCV reaches 4.79 V, which is much higher than the results of studies by Chiba (4.19 V) and Li (4.3 V), 49,50 while the minimum opencircuit voltage is more than 4.06 V, which demonstrates that the system has a high operating voltage. In addition, the theoretical specific capacity can reach 275 mA h g −1 .…”