Detailed explanation of lithium battery copper foil technology and development trends

Copper foil technology for lithium batteries Copper foil is one of the key materials for processing lithium batteries, and its quality directly affects battery technology and performance. Initially, copper foil was only used in the production of PCB boards, and it was divided into two extraction processes: calendering processing and electrolytic processing. Because the former has the defects of long process, high cost and poor consistency, electrolytic copper foil is currently used as a comparison in the world. Consistent preparation method. In order to ensure that the negative electrode material coated on the electrolytic copper foil does not fall off, a suitable binder must be added during preparation. It is known that the currently commonly used adhesives are PVDF, PTFE, SBR, LA133, etc. The bonding strength not only depends on the physical and chemical properties of the adhesive itself, but also has a great relationship with the surface characteristics of the copper foil. When the bonding strength of the coating is high enough, the negative electrode may be prevented from powdering and falling off during the charge and discharge cycle, or the substrate may be peeled off due to excessive expansion and contraction, thereby reducing the cycle capacity retention rate. On the contrary, if the bonding strength does not meet the requirements, as the number of cycles increases, the internal impedance of the battery increases due to the increase in the degree of peeling of the coating, and the cycle capacity declines intensified. The development trend of copper foil for lithium batteries. With the large-scale use of electronic products, higher requirements have been put forward on the specifications and quality of lithium batteries. It has also brought new opportunities for the development of the lithium battery industry and the copper foil industry. The performance and quality of copper foil put forward higher requirements: 1. The performance, accuracy and consistency of copper foil are higher; 2. The thickness is thinner to meet the high volume capacity requirements of lithium batteries. The current direction is to develop copper foil with a thickness of less than 9m; 3. Microscopically solve the surface to strengthen the anti-oxidation, anti-corrosion and conductivity capabilities, as well as the adhesion strength to the negative active material; 4. In order to adapt to polymer lithium batteries and high The development of two-dimensional and even three-dimensional copper foil is required for capacity alloy anode materials. Regarding the copper foil industry, the current supply-demand relationship of low-end copper foil has basically stabilized. Therefore, we expect that with the explosive rise of the domestic new energy automobile industry, it will drive the rapid development of the lithium battery industry. Copper foil is used as a lithium battery. One of the important parts will also rise rapidly with the development of the lithium battery industry in the future. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Briefly describe the technical status of the four key materials of lithium batteries