Electrochemical performance of the Li-rich layered Li1.2Mn0.54Ni0.13Co0.13O2 cathode material influenced by Fe3+ doping

The extensive application of the layered Li-rich Mn-based cathode material is limited due to the inferior cycling stability, rate capability and voltage decay. The electrochemical performance of Fe3+ doping Li1.2Mn0.54Ni0.13Co0.13O2 cathode material synthesized by sol-gel method was investigated in this paper. It is indicated that Fe3+ doping Li1.2Mn0.54Ni0.13Co0.13O2 cathode material shows excellent electrochemical performance at high current intensity rates, especially the cycling stability and capacity retention. The cathode Li1.2Mn0.54Ni0.13Co0.12Fe0.01O2 exhibits excellent initial discharge capacities of 193.5 mAh g−1 at 1 C, 179.8 mAh g−1 at 2 C and 119.6 mAh g−1 at 5 C, and expresses remarkable capacity retention of 87.1% at 1 C and 84.0% at 2 C after 100 charge/discharge cycles, respectively. It is attributed to the beneficial effects of the Fe3+ doping in the cathode material, which enlarges the lithium layer spacing, decreases charge-transfer resistance and accelerates the Li+ diffusion, significantly slows down the decomposition of Li2MnO3, and efficiently alleviates the irreversible loss of lattice oxygen and the Mn dissolution during cycling.