Ti- and F- co-doped Li1.2Mn0.75Ni0.25O2 as efficient cathode materials for Li-ion batteries

Recently, the enhancement of electrochemical performance of Li- and Mn-rich layered cathodes by the co-doping method of cation and anion is under intense investigation. Therefore, Ti and F co-doped Li1.2Mn0.75Ni0.25O2 cathode materials were synthesized and examined in this study. The Ti and F co-doping affects the phase structure and grain morphology of the pristine sample. Consequently, it improves cycle performance, Coulombic efficiency, and Li+ diffusion coefficient number for the cathode. The doped sample can deliver a stable capacity of 180 mAh g−1 with excellent capacity retention of 93 % after 150 cycles at C/2, higher than that of the pristine sample (80 % capacity retention). This work provides further evidence for the positive effect of the co-doping method on the enhancement of electrochemical performance in Li- and Mn-rich layered cathode materials.