▎ 摘　　要

NOVELTY - The cathode has an anode material thin film, and a solid electrolyte interphase protective layer including graphene nanoparticles formed on the anode material thin film. The graphene nanoparticles are manufactured by pulverizing carbon nanotubes (CNT). The CNTs are single-walled carbon nanotubes (SWCNTs) or multi-walled carbon nanotubes (MWCNTs). The negative electrode material thin film is any one metal selected from lithium, magnesium, sodium, potassium, and aluminum. The protective layer has a thickness of 50-3000 nm. USE - Cathode for secondary battery such as lithium metal battery, lithium-sulfur battery, lithium-air battery, lithium ion battery, magnesium ion battery, sodium ion battery, potassium ion battery and aluminum ion battery used in portable electronic device, mobile unit, power device, and energy storage device (all claimed). ADVANTAGE - The lithium metal battery forms the artificial SEI layer as a protective layer on the lithium cathode to stabilize the electrochemical performance of the lithium metal battery, thus increasing the coulombic efficiency of the battery, charge and discharge capacity, life, and electrochemical properties such as charge and discharge rate can be improved. The contact point between the negative electrode and the electrolyte of the lithium metal battery can be stabilized, which ignites the battery, and can suppress the formation and diffusion of lithium dendrite so that internal short circuit does not occur. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for producing a negative electrode. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of a cathode.