Negative electrode material of solid-state lithium battery as well as preparation method and application of negative electrode material

The invention relates to the technical field of solid-state batteries, in particular to a negative electrode material of a solid-state lithium battery and a preparation method and application thereof. The negative electrode material of the solid-state lithium battery provided by the invention is selected from foamed aluminum, has the characteristics of adjustable pore diameter, adjustable porosity and large specific surface area, can accommodate sufficient liquid electrolyte or solid electrolyte, and is beneficial to improving the battery performance; moreover, the foamed aluminum is of a through hole structure, and lithium ions can penetrate through the front and back surfaces of the aluminum foil and can react with the positive electrode materials corresponding to the front and back surfaces; foamed aluminum is adopted as a negative electrode material, lithium ions can be preferentially deposited in the foamed aluminum, and the surface of the foamed aluminum is still smooth and flat after multiple cycles; i