Improving the cycle stability and rate performance of LiNi0.91Co0.06Mn0.03O2 Ni-rich cathode material by La2O3 coating for Lithium-ion batteries

In this wok, a uniform layer of La2O3 is coated on the surface of LiNi0.91Co0.06Mn0.03O2 Ni-rich cathode material by using a wet coating process. The XPS and EDX analysis confirms the presence of La2O3 coating on the surface of NCM. The coated samples deliver the superior electrochemical performance, 0.2 wt % La2O3 (LaO-0.2) NCM exhibits discharge capacity of 202.7 mAh g−1 in 1st cycle and delivered the cycle stability of 87.2% after 100 cycles. Besides, the enhanced capacity retention, LaO-0.2 has delivered very high discharge capacity of 80.3 mAh g−1 at very high C-rate of 5C while the pristine sample shows very low discharge capacity (33.4 mAh g−1). CV results shows the significant suppression in the intensity of H2–H3 which indicates the superior electrochemical stability of LaO-0.2 NCM. Thus, we can confirm that La2O3 coating is promising technique to achieve superior electrochemical performance in the long term cycling process.