Preparation and Electrochemical Characterization of La and Al Co-doped NCM811 Cathode Materials

[Image: see text] LiNi(0.8)Co(0.1)Mn(0.1)O(2) (NCM811) became a research hot point because of its low cost, environmental friendliness, and excellent electrochemical performance. However, Li(+)/Ni(2+) intermixing is an essential factor affecting its applicability. Doping could be an important method to improve the electrochemical performance of NCM811-based cathode materials. In this work, La and Al co-doped NCM811 was prepared by a solid-state method. Results from X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) and electrochemical performance were discussed in depth. These showed that when La and Al doping concentrations were 1 and 0.5%, the samples showed the best performance. The as-improved performances were mainly attributed to the reduced Li(+)/Ni(2+) intermixing, suppressed phase transition, and decreased potential polarization and impedance.