<p>With the advancement of electric vehicles and portable electronic devices, the market has increasingly stringent requirements for the energy density and safety of lithium-ion batteries. As a result, solid electrolytes with high energy density and enhanced safety have emerged. Among these, garnet solid electrolytes are considered one of the most promising materials due to their high electrochemical stability and wide electrochemical window. However, they are unstable in air, susceptible to Li⁺/H⁺ exchange reactions, and can further react with CO₂ in the atmosphere to form lithiophobic Li₂CO₃ layers. In recent years, researchers have proposed various solutions to address this issue. This article will briefly introduce some of these approaches, including mechanical polishing, acid treatment, heat treatment, and in-situ reaction treatment. Currently, the methods for removing surface lithium carbonate through mechanical polishing, acid treatment, and heat treatment still exhibit certain limitations, while in-situ reaction treatment shows significant potential for improvement and it will become the focus of future research.</p>