High-temperature ultrahigh-strength high-elongation lithium battery copper foil and production process thereof

The invention discloses a high-temperature ultrahigh-strength high-elongation lithium battery copper foil and a production process thereof, and the production process comprises the following steps: S1, preparing an electrolyte: dissolving raw material copper in a sulfuric acid solution to form a dissolved solution, filtering to remove impurities, and mixing with a composite additive to obtain the electrolyte; wherein the composite additive comprises organic sulfide, gelatin, polyethylene glycol, a nitrogen-containing compound, a polyether compound and Cl ; s2, a primary copper foil product is prepared, the electrolyte is guided into an electrolytic bath of a crude foil machine through a pipeline, and the primary copper foil product is obtained after electroplating; and S3, carrying out surface passivation treatment on the copper foil primary product, drying and rolling to obtain the ultra-high-strength lithium battery copper foil. A high-performance additive is introduced to control grain refinement and un