Effect of La³⁺ doping on the structure and electrochemical properties of LiNi_0.8Co_0.15Al_0.05O₂

Co-precipitation method was used to prepare LiNi_0.8Co_0.15Al_0.05O₂ anode materials with La³⁺ added. The XPS, X-ray analyzer, scanning electron microscope, electrochemical workstation, and battery charge and discharge test system were used to discuss the effects of different addition of La³⁺ on the structure, morphology and electrochemical performance of anode materials. Results show that, compared with the non-added LiNi_0.8Co_0.15Al_0.05O₂ cathode material, the material with La³⁺ has a larger primary particle size, better sphericity, and the Rsfand Rct impedance of the martials shows a decrease. When the doping amount of La³⁺ is x=0.01, the material's high-current cycle stability is greatly improved. After 100 cycles under 1 C, the capacity retention of La³⁺ is 75.81%, while that of the non-added materials is only 49.57%. Apart from that, the discharge specific capacity of the battery adding La³⁺ material at 0.5 C, 1 C, or 5 C is also significantly higher than that of non-added materials