4.5μm
PET film coated with double-sided copperThis is a brilliant innovation aimed at surpassing people's imagination. By plating 1 μ m of copper on both sides of a 4.5 μ m PET film, a 6.5 μ m PET copper plated film, also known as PET copper foil, is formed. This is a composite copper foil. This revolutionary technology utilizes polymer based PET as a substitute for traditional copper metal, featuring low density, low Young's modulus, high compressibility, and low cost. Compared to traditional copper foil, PET copper foil is thinner and requires less copper, effectively improving the safety and energy density of lithium batteries.
The manufacturing process of lithium-ion copper foil can be divided into two types: electrolytic copper foil and PET copper foil. Electrolytic copper foil is currently the mainstream process in the market, while PET copper foil is an emerging process. The biggest difference between PET copper foil and traditional copper foil is the preparation process. Traditional copper foil is mostly prepared by electrolysis, while PET copper foil mainly relies on
Vacuum coatingAnd ion exchange technology.
In the traditional copper foil preparation process, copper is mainly deposited on copper based flooring through electrolysis to form the desired copper foil. The preparation process of PET copper foil is different. Firstly, vacuum coating is carried out on both sides of the PET film to coat each side with 1 μ m copper. In this way, a 6.5 μ m thick PET copper plated film, also known as PET copper foil, is formed on the PET film. The next key step is ion exchange. By immersing the copper foil in an ion solution, the copper ions on the foil can undergo an exchange reaction with the displaced ions in the ion solution, replacing the ions on the surface of the foil. This process can not only improve the quality of the copper coating on the surface of PET film, but also remove impurities on the copper foil and improve its quality.
The emergence of PET copper foil has brought many advantages. Firstly, due to the low density and low Young's modulus of PET substrate, PET copper foil is thinner and lighter than traditional copper foil, which can reduce the overall weight of the battery and improve its energy density. Secondly, PET copper foil has high compressibility, which can better adapt to the expansion and contraction changes of lithium batteries during charging and discharging, thereby improving the reliability and lifespan of the battery. In addition, the preparation cost of PET copper foil is relatively lower, which reduces the production cost to a certain extent.
Overall, through the innovative process of plating double-sided copper on 4.5 μ m PET film, we have successfully produced
PET copper foilThis new type of composite copper foil perfectly combines advantages and innovation. It not only has the characteristics of thin thickness and low copper consumption, but also effectively improves the safety and energy density of lithium batteries. The preparation process of PET copper foil is different from the traditional electrolytic copper foil preparation process. Copper foil preparation on PET film is achieved through vacuum coating and ion exchange technology. This revolutionary innovation has brought many benefits to the lithium battery industry, bringing us more efficient, safer, and reliable lithium battery products.
