High-capacity high-Ni low-Co Li-rich layered oxides via adjusting Li2MnO3 content and Li/Ni mixing defects

The reasonably regulated Li2MnO3 phase content and Li/Ni disordering are developed to obtain a high-capacity high-Ni low-Co LLO Li1.167Ni0.222Mn0.537Co0.074O2 (L2-1), by two-step adjustment of the Ni/Mn and Li/Mn ratios. Based on the XRD refinement and density functional theory calculation, it is found that a proper Li2MnO3 content (36.6%) and a high Li/Ni disordering (5.93%) in LLOs play a crucial role in achieving high-capacity and high-voltage performance.