Among lithium-ion battery components, the separator has the highest technical content, and it is also a component that has not been completely localized in my country. Every progress in this area may bring breakthroughs in the production and application of domestic lithium battery products, Xiamen University and AVIC The "Technological Development of Functional Separators for High-Safety Power Batteries" project jointly undertaken by Lithium Battery (Luoyang) Co., Ltd. is such a product. The new separator is a ceramic functional separator that uses substrate film surface treatment technology and inorganic ceramic powder dispersion technology to optimize the coating effect of ceramic powder and establish the relationship between coating thickness, ceramic type, particle size, surface characteristics, etc. and battery performance The dose-effect relationship is summarized and the changing rules of technical parameters of ceramic diaphragms are summarized. The developed diaphragm has both current cutting characteristics and high heat resistance, and its technical indicators have reached the world's advanced level. Not only ordinary lithium batteries, but also single polymer lithium batteries can meet the high consistency requirements. The heat shrinkage rate of a polyethylene separator coated with aluminum oxide with a thickness of 3 microns is less than 2% in 2 hours at 150°C. The performance is better than similar foreign products. The new separator also contributes to the development of the domestic new energy vehicle industry. One of the important reasons for the skyrocketing stock prices of Tesla and Kandi is that it breaks through the battery life bottleneck of electric vehicles, allowing them to be commercialized on a large scale in the United States. Tesla continues to Increasing production and user acceptance in the United States can foresee the future development scale of electric vehicles in our country. The AVIC lithium battery separator project has built a ceramic functional separator test line with an annual output of 3 million square meters. On this basis, it has completed the development of curing, slurry, coating, and slitting process technologies to form production capabilities, and carried out ceramic separator battery design, Trial production and testing play a vital role in improving the safety of lithium-ion power battery production and application. With crude oil prices high and domestic air pollution due to exhaust emissions serious, this is undoubtedly a positive energy for the promotion and use of new energy vehicles.

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