Recently, the research team helmed by Researcher Liu Qi and Professor Chen Renjie at the Beijing Institute of Technology (BIT) has made remarkable strides in the engineering of inert gas protective coatings, successfully stabilizing high-voltage nickel-rich cathode materials. In their study, they strategically introduced oxygen vacancies onto the surface of LiNi_0.90Co_0.05Mn_0.05O₂ ultra-high nickel cathode materials. This was achieved by meticulously controlling the calcination process within an argon atmosphere, resulting in the formation of a layered spinel protective coating. This groundbreaking approach significantly bolstered the high-voltage cycling stability of the material, which retained a discharge specific capacity of 165.9 mAh g^-1 after 150 cycles at a 1C rate, boasting an impressive capacity retention rate of 83.6%. The pertinent research findings have been published in the esteemed international journal, Advanced Functional Materials.