Explain in detail the development status of high-end separator technology for lithium batteries and the use of separators

Lithium battery diaphragm technology is currently a pain point of my country's power lithium-ion battery industry. Among the lithium battery materials, the positive and negative electrode materials and electrolyte have basically achieved domestic production, but the diaphragm started late, and the domestic company's technology maturity is not high. Although the localization rate of lithium battery separators in my country has been increasing in recent years, the market for low-end 3C battery separators is the key market. The localization rate of high-end separators is still very low, and there are still a large number of separators for high-end 3C batteries and power lithium-ion batteries. Rely on imports. As we all know, in the structure of lithium batteries, the separator is one of the key inner layer components. It is necessary to guard against the contact between the positive and negative electrodes and to ensure the passage of electrolyte ions. Therefore, the quality of the separator will directly affect the capacity, cycle and safety performance of the battery. A separator with excellent quality has an important purpose for improving the overall performance of the battery. Diaphragm is currently a high-value-added material with the highest technical barrier among lithium battery materials, accounting for about 15% of the cost of lithium batteries. The technical difficulty lies in the engineering technology, matrix materials, and manufacturing equipment for making holes. The current common problems in domestic diaphragms are inconsistency, irregular defects, substandard porosity, uneven thickness, pore distribution, and pore size distribution. Uniaxially stretched domestic PP membranes are relatively close to foreign products in terms of porosity and pore size distribution; bidirectionally stretched PE membranes are generally lower in porosity than foreign products, and the pore size distribution is not ideal. These problems are potential risks that the industry is subject to people. If they are not handled well, they may curb the healthy development of my country's lithium battery industry. High-end lithium battery separator technology has a very high threshold. It not only requires a huge investment, but also a strong Ru0026D and processing team, proficient technology and high-level processing line, and it can be broken in a short time. However, the Sino-US trade war and the ZTE-Huawei incident have sounded the alarm for my country's manufacturing industry. As far as the entire power lithium-ion battery industry is concerned, it is urgent to break through the high-end lithium battery diaphragm technology as soon as possible. If domestic diaphragm companies want to do more, they have to make up for three major categories of materials, equipment and process control, including the surface solution process of the basic material, the adhesive formulation process, and the product stamping and drawing. In addition, in the upper reaches of the diaphragm industry chain, Core processing equipment, including domestic coating machines, must also catch up and achieve greater breakthroughs in localization as soon as possible. Use of Lithium Battery Separator Separator is one of the key components of lithium battery. The main material of the separator is porous polymer film, including polyethylene and polypropylene. The separator for lithium batteries has strict requirements on safety, permeability, porosity and thickness. In a lithium battery, charged ions flow between the positive and negative electrodes to form a current, and the separator is located between the positive and negative electrodes inside the battery. It is necessary to guard against direct contact between the positive and negative electrodes, and to ensure the smooth passage of electrolyte ions. . Lithium battery electrolyte seems to be a river. Lithium ions are like a boat traveling on the river. The diaphragm is a dam built around the waist. Each diaphragm hole is like a gate on the dam. Under normal circumstances, the ions travel freely to the positive and negative poles. Cycle of charge and discharge. High-end diaphragms are generally accompanied by ceramic materials. If the temperature of the electrolyte is too high, the material will expand, and the pores will be closed like a gate, cutting off the ion exchange, thereby preventing the lithium battery from catching fire and exploding due to the high temperature. Diaphragm is the material with the highest technical barrier among lithium battery materials. The technical difficulty lies in the engineering technology, matrix material, and manufacturing equipment for making holes. If the development of lithium batteries is not controlled by others, high-end materials such as diaphragms cannot be avoided! High-end diaphragm technology has a very high threshold, not only requires a huge investment, but also a strong Ru0026D and processing team, proficient process technology and high-level processing line. 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 post: What is the capacity of lithium batteries? What are the uses of lithium battery capacity?