The impedance spectra of the samples are provided in Figure , confirming a dramatic reduction in the impedance of the cathodes from 438 Ω to 91 Ω and 136 Ω through the addition of Al2O3 and MoO3 artificial CEI layers. Correspondingly, not only the coating layers showed no adverse effect on the Li-ion diffusion, but also, they improved the lithiation/delithation procedure. The obtained results indicated that the presence of coating layers could efficiently suppress the side reactions in the electrodeelectrolyte interface and so enhance the charge transfer. The difference observed in both impedances, as well as the discharge capacity of the 811@Al2O3 and 811@MoO3 could be originated from a higher thickness of the coating layer in the 811@MoO3, causing losing the active cathode materials. Moreover, an increase in the formation of inactive materials of Li-Mo-O solid solution phases could be another possible reason for the detected variance.