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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.

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