PP/PET composite copper foil has advantages in solving inherent safety issues of batteries

Plastic composite copper foil is on the eve of scale and industrialization. By improving the safety and energy density of lithium batteries, it is expected to have lower manufacturing costs in the future.

Appearing in the marketPET, PP composite copper foilThere are two types of material structures, and currently PET composite copper foil has a high level of attention. We believe that PET composite copper foil has advantages in solving the inherent safety problems of batteries, and the industrialization process is beginning to take off. The prospects are promising, and we are optimistic about the potential of PET composite copper foil as a substitute for electrolytic copper foil in traditional lithium batteries,

Electrolytic copper foilAs a key basic material for the negative electrode of lithium batteries, it is the carrier of the negative electrode active material, as well as the collector and conductor of negative electrode electrons in lithium batteries. Due to its excellent conductivity, flexibility, and mechanical processing properties, as well as low processing costs and mature technology, copper foil is the preferred material for lithium battery negative electrode material carriers and current collectors.

In the production process of lithium batteries, the negative electrode active material is uniformly mixed with about 90% negative electrode active material carbon material, 4% -5% acetylene black conductive agent, and 6% -7% binder and coated on the surface of copper foil current collector. After drying, rolling, cutting and other processes, the negative electrode can be produced. The performance of copper foil has a great impact on the performance of lithium batteries.

Composite copper foilFor copper polymer copper composite structure, it is a new type of copper foil material with polymer as the substrate and copper plating on both sides. Polymer materials such as PET, PVC, PI, PP, etc. are selected as the substrate. Organic polymer materials have insulation and flexibility, which can meet the winding requirements of foil materials.

Plastic composite copper foil is a mainstream process that involves magnetron sputtering on a polymer substrate to deposit copper on both sides of the substrate, followed by water plating to thicken the copper metal layer. The manufacturing of plastic composite copper foil is an emerging technology and is in its infancy.

In addition, there are substrate magnetron sputtering vacuum evaporation water plating processes, etc. Compared with the previous process, the vacuum evaporation process is added to further thicken the copper layer on the substrate after magnetron sputtering, reduce the amount of copper plated by magnetron sputtering, and then perform aqueous medium electroplating to thicken the copper film.

Lithium ion batteries stand out among numerous energy storage devices due to their high mass energy density and volumetric energy density. They are widely used in mobile electronic devices such as laptops, mobile phones, electronic watches, and even as a driving energy source for transportation vehicles such as electric bicycles and electric cars. With the development of portable electronic devices, there is an increasing demand for lithium-ion batteries with lighter weight and higher energy density.

Lithium ion batteries typically consist of a multi-layer electrode structure consisting of a current collector, an active material, a separator, and a casing. The current collector's main function is to carry the active material and collect the current generated by the active material for transmission to the outside world. Generally, the positive electrode current collector is aluminum foil, and the negative electrode is copper foil. As a part of lithium-ion batteries, the current collector is an inactive component that can affect the quality and energy density of lithium-ion batteries. The commonly used copper foil anode current collector accounts for about 10% of the total mass of the battery. Therefore, in order to obtain low-quality, high-energy density lithium-ion batteries, lighter negative electrode current collectors are needed.