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Lithium metal is widely concerned and valued by people because of its technical advantages such as extremely high energy density and lowest electrode potential, but the crystallization problem of lithium metal is very serious at this stage, which greatly restricts and limits the commercial development of lithium batteries. In this paper, we firstly analyze the connotation of PIMs in detail, and summarize the experimental procedure and conclusions of high-quality lithium metal anode protective film based on PIMs in combination with the current research status of high-quality lithium metal anode protective film.