Lithium metal negative electrode protection layer and preparation method and application thereof

The invention relates to the technical field of lithium ion batteries, and discloses a lithium metal negative electrode protection layer, which comprises a PAN polymer skeleton layer, a polymer protection layer and a lithium metal layer, one side of the PAN polymer skeleton layer is coated with the polymer protection layer, and the lithium metal layer is arranged on the other side of the PAN polymer skeleton layer; the PAN polymer skeleton layer contains ionic liquid, and the ionic liquid is uniformly dispersed on the surface of the lithium metal layer. The PAN polymer skeleton plays a role in adsorbing a proper amount of ionic liquid, so that the ionic liquid is uniformly dispersed on the surface of the lithium metal, the interface contact between the polymer and the lithium metal is improved, and a LiF substance with a stable interface is generated under the electrochemical action. 本发明涉及锂离子电池技术领域，公开了一种锂金属负极保护层，包括PAN聚合物骨架层、聚合物保护层和锂金属层；所述聚合物保护层涂布于所述PAN聚合物骨架层一侧，所述锂金属层设置于所述PAN聚合物骨架层另一侧；所述PAN聚合物骨架层内含有离子液体，且所述锂金属