Can ceramic-coated lithium battery separators really improve battery safety performance?

Ceramic-coated lithium battery separators will be widely used. It is an important means to deal with the safety of lithium batteries, and it is also a direction for the development of lithium battery separators in the future. Dealing with the safety of lithium batteries has become an important development direction for separators in the future, and coated separators are an important choice to meet the safety requirements of lithium batteries. After the diaphragm is ceramic coated, 8%-10% of the pores are basically overturned, and it can withstand high temperatures of 240°C. Through the puncture experiment done by the customer, the safety of the ceramic diaphragm is much better than the general diaphragm used on the lithium battery. In order to ensure the safety of lithium batteries, battery factories in South Korea have basically begun to use ceramic-coated separators. South Korea’s SK Energy Storage Innovation Business Development Director JIN-YoungCHOI said at the third high-tech lithium battery industry summit at the beginning of this year that Korea has begun to popularize and promote the use of ceramic-coated diaphragms. Ceramic diaphragm is to coat nano-scale ceramic particles on the diaphragm. Its main purpose is to improve the heat shrinkage resistance of the diaphragm, and to guard against the large area short circuit caused by the shrinkage of the diaphragm. In addition, ceramics have low thermal conductivity, and some thermal runaway points in the lithium battery should be enlarged to form an overall thermal runaway. Generally, it can withstand high temperature around 200℃. The market for ceramic coating is critical for high-voltage batteries and power lithium-ion batteries. There are two development directions: one is to coat alumina, represented by LG, using dip coating; the other is to make a layer of aramid on the surface, represented by Japan's Teijin. Ceramic diaphragm is a kind of nano-scale ceramic particles, which can be coated on the battery diaphragm, which can improve the heat resistance and strength of the lithium battery diaphragm, and guard against the large area short circuit caused by the diaphragm shrinkage. In addition, the ceramic thermal conductivity is low, and some thermal runaway points in the guard battery are enlarged to form an overall thermal runaway. It can withstand high temperatures around 200°C and is very suitable for power lithium-ion batteries. Since the performance of the diaphragm directly affects the battery's internal resistance, discharge capacity, cycle life, and safety performance of the lithium battery, the manufacturing of lithium batteries has extremely high requirements for the consistency of diaphragm material products. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How to charge the lithium iron phosphate battery