Facile Dry Coating Method of High‐Nickel Cathode Material by Nanostructured Fumed Alumina (Al ₂ O ₃ ) Improving the Performance of Lithium‐Ion Batteries

Surface coating is a crucial method to mitigate the aging problem of high-Ni cathode active materials (CAMs). By avoiding direct contact CAM and electrolyte, side reactions are hindered. Commonly used techniques like wet or ALD time consuming costly. Therefore, more cost-effective technique desirable. Herein, facile fast dry powder process for CAMs with nanostructured fumed metal oxides reported. As model case, NMC (LiNi0.7Mn0.15Co0.15O2) by Al2O3 investigated. A high coverage surface an almost continuous layer achieved, still showing some porosity. Electrochemical evaluation shows significant increase in capacity retention, cycle life rate performance coated material. The protects successfully prevents reactions, resulting reduced solid electrolyte interface (SEI) formation charge transfer impedance during cycling. mechanism on how enhances cycling hypothesized. stable effectively crack particle disintegration NMC. In depth analysis indicates partial LixAl2O3/LiAlO2 cycling, enhancing lithium ion diffusivity thus, also performance.