The Improved Interfacial and Thermal Stability of Nickel‐Rich LiNi_0.85Co_0.10Mn_0.05O₂ Cathode in Li‐Ion Battery via Perovskite La₄NiLiO₈ Coating

Abstract Capacity attenuation caused by Ni dissolution and interface instability during cycling is a major challenge because it limits the application of high Ni ternary cathode materials in Li‐ion batteries. In this paper, ternary LiNi_0.85Co_0.10Mn_0.05O₂ cathode with high nickel content was prepared by co‐precipitation method, and then was coated with perovskite La₄NiLiO₈ via the simple thermochemical method. The analysis of the images of transmission electron microscope (TEM) showed that the coating is uniformly covered on the surface of NCM85 material with a thickness of 5 nm. Compared to uncoated sample, the La₄NiLiO₈‐coated LiNi_0.85Co_0.10Mn_0.05O₂ material shows lower electrochemical impedance and better cyclic stability, the initial kinetic diffusion coefficient and the interface stability of the prepared material are greatly improved. Meanwhile, the problems of Li⁺/Ni²⁺ mixing are also been solved. This work provides a new strategy for improving the interface and thermal stability of the nickel cathode material of Li‐ion battery in the future.