▎ 摘　　要

NOVELTY - Secondary battery comprises lithium metal layer, solid electrolyte layer, and negative electrode interface modification layer arranged between lithium metal layer and solid electrolyte layer. The negative electrode interface modification layer includes lithium fluoride, metal lithium alloy, polyethylene glycol (PEG), lithium salt and carbon material. USE - Secondary battery used in electrical equipment (claimed). ADVANTAGE - The negative electrode interface modification layer contains a carbon skeleton structure, which can conduct lithium ions and electrons. The metal lithium alloys promote the transport of lithium ions in the interface modification layer. The lithium fluoride has good ion conductivity, and inhibits the growth of lithium dendrites, protects the metal lithium anode, and improves the cycle stability of the metal lithium anode.