Enhancing the cycling stability of Co-free high-Ni layered cathodes through MgO surface engineering.

A magnesium oxide (MgO) coating strategy is proposed for improving the cobalt-free high-nickel LiNiMnO cathode. It is revealed that a MgO coating can stabilize reversible Ni/Ni redox and suppress structural degradation. The MgO coated LiNiMnO exhibits a promising capacity retention of 66.