METHOD FOR PRODUCING HOT-DEFORMED COMPOSITE POWDER MATERIALS Pb-С Russian patent published in 2023 - IPC H01M4/16 

FIELD: powder metallurgy.

SUBSTANCE: used in the production of hot-deformed Pb-C materials for porous electrode grids of lead-acid batteries, as well as lithium-ion batteries. The method for obtaining a hot-deformed Pb-C composite powder material includes the preparation of a charge based on lead and graphite powders in a dry environment and subsequent hot pressure treatment. The process is carried out in a high-energy mill in air in two stages: at the first stage, mixing with graphite powder with a content of 0.15 or 0.50 wt.% is carried out for 1.2 ks at a rotor speed of 150 rpm, at the second - mechanical activation for 1.8 or 3.0 ks, respectively, at a rotor speed of 290 rpm. Hot working of the workpiece by pressure is carried out by hot stamping with reduced pressure work W=36.6 MJ/m³ and preliminary cold compaction at 500 MPa or spark plasma sintering in a vacuum of 4.6⋅10 Pa at heating rate 50° S/min and current~ 100 A for 0.42 ks.

EFFECT: increasing the mechanical strength of the electrode grid, increasing the reliability of the lead-acid battery and reducing manufacturing costs.

1cl 2 dwg, 3 tbl, 8 ex