Do you know the purpose of the ceramic separator for lithium batteries?

The use of ceramic separators for lithium batteries Lithium battery ceramic separators are one of the four key materials for lithium batteries. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance It has an important use for improving the overall performance of the battery. The important purpose of the lithium battery ceramic separator is to separate the positive and negative electrodes of the battery to prevent the two poles from contacting and short-circuit. In addition, it also has the function of allowing electrolyte ions to pass through. In addition, since the electrolyte is an organic solvent, the separator must also be resistant to organic solvents. The inside of the porous structure of the ceramic separator of the lithium battery can store and retain the electrolyte to achieve lithium ion conductivity. The ion conductivity of the lithium battery separator is directly related to the overall performance of the battery. Its use to isolate the positive and negative electrodes enables the battery to limit the increase in current when the battery is overcharged or the temperature rises, and prevents the battery from short-circuiting and causing an explosion. Hole self-closing protection purpose, for the purpose of safety protection for battery users and equipment. The price of ceramic diaphragms for lithium batteries The research data of the Lithium Battery Industry Research Institute shows that although most battery cell companies are paying attention to ceramic coated diaphragms, there are still too few companies that can really apply them in large quantities. At present, relatively large-scale lithium battery manufacturers often require cell manufacturers to use ceramic coating films, which has also prompted many battery manufacturers and separator manufacturers to invest a lot of energy on ceramic coating research. But in fact, ordinary battery cell factories cannot afford the cost of high-end ceramic-coated diaphragms. The gross profit margin of the entire diaphragm industry dropped from more than 40% in 2012 to about 20% in 2013. At present, the general price of domestic lithium battery ceramic coating film is more than 9 yuan/square meter, and the price is 4-5 yuan/square meter more expensive than ordinary membranes, and the cost is increased by 2-3 yuan/square meter. Some of the high-end products are even more expensive. high. In fact, the quality of the substrate directly determines the quality of the ceramic coated diaphragm. At present, the market price of ceramic coated diaphragms on the market ranges from 8 yuan/square meter to 20 yuan/square meter, which mainly depends on the quality of the substrate. In addition, some domestic companies that make high-end lithium battery ceramic-coated separators mostly purchase Japanese equipment, and an imported equipment processing line costs 20 million yuan. 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: Why does the electric vehicle lithium battery charger charge and heat?