Commonly, the Li and Ni mixing occurs in the Ni-rich cathode materials, occupying the Li sites. Heavier Ni + cations result in a weaker 003 intensity, so the (003)/(104) ratio could be employed to examine the cation mixing degree. In general, if I003/I104 is larger than 1.2, the layer structure could be expected obvious, and the material's electrochemical performance will be good. As shown in Figure , the I003/I104 of 811@MoO3 and 811@Al2O3 are 1.94 and 2.05, respectively. The I003/I104 of them are larger than that of 811, demonstrates the coating can stabilize the NMC811 crystal structure. In addition, the split of (006)/(012) and ( )/(110) can also indicate the degree of cationic mixing. The (006)/(012) peak split of NMC@Al2O3 is more obvious than that of NMC@MoO3 in Figure , indicates 811@Al2O3 has less cationic mixing. But the split of (018)/(110) peaks are similar for those samples in Figure . In Figure , the peaks situate at 232.15 and 235.31 eV can be ascribed to the Mo 3d5/2 and 3d2/3 of MoO3. In Figure , the peak observed in 73.38 eV corresponds to Al 2p of Al2O3.