An appropriate Zn2+/Mn2+concentration of the electrolyte enables superior performance of AZIBs

The superior performance of AZIBs with MnO as the cathode of 246 mA h g −1 after 5000 cycles at 1 A g −1 is achieved due to the beneficial effects of the optimized 0.5 M ZnSO 4 + 0.5 M MnSO 4 electrolyte on both the anode and the cathode.