▎ 摘　　要

NOVELTY - Preparing metal lithium cathode comprises (a) mixing solvent A, polymer A, polymer B, Lithium salt A according to the mass ratio of 9:0.8:(0.1-0.3):0.05, and stirring evenly to obtain film-forming solution A, (b) applying the film-forming solution A on the surface of the metal lithium cathode by spin coating, drying and forming an organic polymer protective layer, (c) soaking the metal lithium cathode in solvent B to make through holes, solvent B does not dissolve polymer A, but it does dissolve polymer B, (d) adding solvent C and lithium salt B into lithium salt solution A, lithium salt solution A and lithium pro-lithium substance A, mixing according to a mass ratio of 10: (0.05-0.1), and stirring evenly to obtain lithiophilic solution A, (e) spin coating the lithium-philic solution A on the surface of the metal lithium cathode in an amount of 30-60 ul/cm and reacting for 2-10 minutes to form a layer with lithiumphilic sites. USE - Preparation method of metal lithium cathode is used in battery (claimed) e.g. lithium ion battery and lithium polymer battery. ADVANTAGE - The method induces uniform nucleation and growth of lithium metal, changes the deposition direction of lithium metal, improves the ionic conductivity of the composite protective film, and at the same time suppress the formation of lithium dendrites and reduce the side reactions caused by the direct contact between the cathode and the electrolyte.