What is the commonly used material of lithium-ion battery copper foil production method?

Method for the Production of Copper Foils for Lithium-ion Battery

(1) Pressing copper foil: Generally, copper ingots are used as raw materials. They are made by processes such as hot pressure, tempering toughness, scaling, cold rolling, continuous toughening, pickling, compression, and degreasing drying. The production is difficult and the equipment is high in accuracy. Therefore, the cost is also higher; The main difference in the production mode is the type selection of rolling Mills, which are generally imported rolling Mills.

Key technology: the pressure extension copper foil needs to have a smaller thickness deviation, better flatness and residual stress, so copper foil rolling is a key process, the thickness, speed, tension and surface quality control during rolling is particularly important.

(2) Electrolyzed copper foil: Electrolyzed copper foil is formed by depositing copper ions in the electrolyte on a smooth rotating stainless steel plate(or titanium plate) circular cathode drum. The surface of the copper foil pressing the cathode cylinder surface is called the light surface, and the other side is called the hair surface.

Under the action of DC, the divalent copper ions in the copper sulfate electrolyte in the electrolyte are reduced to copper atoms and the crystals are focused on the smooth cathode roller surface that is constantly rotating.

Pretreatment: cleaning of the surface of raw foil, removal of oxidation, and leaching of the surface, generally using sulfuric acid, hydrogen peroxide or its mixed solution for treatment

Anti-oxidation treatment: In order to prevent copper foil from encountering moist air and excessive temperature during storage, transportation and use, an acidic or alkaline anti-oxidation treatment is used on the surface of copper foil. Direct current is used to make copper foil surface produce oxidation film., achieve the purpose of antioxidant

Drying: thoroughly remove moisture without causing damage to the surface of copper foil

Differentiation between Electrolyzed Copper Foils and Pressurized Copper Foils

First, the process of the two processes is different, electrolysis is completed by electroplating process, and the pressed copper is produced by coating method;

Second, the performance is not the same, electrolysis copper conductivity is better, compression copper winding properties are better, generally bending requirements of the product to use pressed copper foil, pressed copper foil unit price is more expensive than electrolysis copper foil;

Third, electrolytic copper molecules are relatively loose and easy to break; The compressed copper molecules are tight and flexible, and the thinner the more flexible the better; The phosphorus-containing extended copper molecules are delicate, and the post-treatment electroplating surface is bright, but the flexibility is less than that of pure compressed copper.

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