The project of "Technology Development of Functional Separator for High-safety Power Battery" supported by Xiamen University and China National Aviation Lithium (Luoyang) Co., Ltd. and supported by National Hi-Tech Research and Development Plan (863 Program) has completed the construction of an annual output of 3 million square meters of ceramics Functional separator test line, on the basis of the completion of the formula curing, paste, coating, cutting technology development, the formation of production capacity, and the ceramic membrane battery design, trial production and testing. The implementation of this project is crucial to improving and supplementing the missing part of the industrial chain of lithium-ion power battery in China, which is of crucial importance for improving the safety of lithium-ion power battery production and application.
The project aims to promote the development of safety functional diaphragm for power lithium-ion batteries, promote the engineering of related technologies and materials, and develop high-safety functional diaphragm production technology for lithium-ion batteries to meet the high performance and low cost of functional diaphragm products The actual application needs as the goal. The substrate film surface treatment technology and inorganic ceramic powder dispersion technology are adopted to optimize the coating effect of ceramic powder and to establish the relationship between the coating thickness, ceramic type, particle size, surface properties and battery performance, and the ceramic membrane technology The law of parameters, the developed diaphragm also has Shutdown function and high heat resistance, technical indicators have reached the world advanced level.
At present, the polyethylene membrane with a thickness of 3μm of aluminum oxide has a thermal shrinkage of less than 2% at 150 ° C for 2 hours, which is better than similar foreign products, and the cost can be controlled at 10 yuan per square meter, which is better The application prospects. After the project is put into production, the project will be massively applied in the fields of lithium-ion battery for car and digital lithium-ion battery, which will greatly improve the safety of lithium-ion battery.
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