NOVELTY - The method comprises supplying a conductive substrate (65), depositing an electrode layer by electrophoresis from a suspension of electrode material particles, on the substrate, drying the electrode layer, and thermally thickening the electrode layer by sintering at a temperature (TR), which is less than 0.3 times a melting point of electrode material, and performing mechanical compaction of the dried layer before or at the sintering step. The mechanical compaction step is carried out by applying a compression pressure of higher than 500 MPa.    USE - The method is useful for manufacturing an electrode layer of solid battery (claimed) such as a lithium-ion battery that is useful as a power supply for autonomous electric devices such as telephone and portable laptops, autonomous sensors and electric vehicles.    ADVANTAGE - The method enables easy and economical manufacture of the electrode layer with high quality and productivity and without any cavities cracks and other defects thus enhancing lifespan, energy density, performance and safety of the battery.    DETAILED DESCRIPTION - The method comprises supplying a conductive substrate (65), depositing an electrode layer by electrophoresis from a suspension of electrode material particles, on the substrate, drying the electrode layer, and thermally thickening the electrode layer by sintering at a temperature (TR), which is less than 0.3 times a melting point of electrode material, and performing mechanical compaction of the dried layer before or at the sintering step. The mechanical compaction step is carried out by applying a compression pressure of higher than 500 MPa. The thermal thickening step and/or mechanical compaction step is carried out under vacuum. An average size (D50) of the particles of electrode material is less than or equal to 30 nm. The electrode layer has a thickness of less than 5 mu m. The electrically conductive and/or conductive nanoparticles of lithium ions are simultaneously deposited with the nanoparticles of electrode material. A zeta potential of the suspensions of electrode material particles is higher than 60 mV. The suspension of the electrode material particles contains an electrostatic stabilizer.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a method for manufacturing an electrode layer in solid battery.    Cathode layer (63)    Substrate (65)    Electrolyte layer (66)    Anode layer (67)    Metallic films on the substrate. (68a)