To characterize the redox mechanism, the magnetic moment (represented by the number of unpaired electrons (Nunp)) was calculated on the elements and the spin density (SD, Figure. In addition to the cation redox, oxygen redox was also found in the three materials, in particular for O anions that are close to Ni cations. It can be observed that the calculated value of 𝑁 unp ̅̅̅̅̅̅ on O is almost zero for these samples in the OCV states, indicating an average charge of 2-on this anion (see Figure -e and Table ). Upon desodiation from x=0.67 to 0.