Figure illustrates the discharge capacity of the prepared cathode arrays in different C-rates, including 0.1, 0.5, 1, 2, 3, 4, and 5. From the figure, the cells delivered the maximum discharge capacity value in the 0.1 C rate, while they reduced through increasing the current rate. This could be assigned to an increment of the electric current local concentration at higher C rates, resulting in the cell polarization and thereby diminishing the discharge capacity. As is apparent, the coated samples with Al2O3 possessed superior discharge capacity at various C-rates, compared with the bare 811 and 811@MoO3. This could be linked with the chemical bonding of the Al2O3 coated layer and the NMC811 cathode surface.