Aramid coated separators are chemicals.
Aramid coated separators are chemicals and are mainly used in the production process of chemical industry, such as lithium ion batteries, chemical storage tanks and other areas. Aramid coated diaphragm is a high performance material with high strength, high pressure resistance and high temperature resistance. It can effectively improve the service life and safety of equipment such as chemical storage tanks and batteries. Therefore, the application prospects of aramid-coated separators in the chemical industry are very broad.
What is the production process of lithium batteries?
The difference between rubber coated diaphragms and ceramic diaphragms: propertiesdifferent.
Diaphragm stuck. After a layer of glue is applied to the surface of the separator, the layer of glue on the surface of the separator will cover part of the gaps on the surface of the separator, thereby blocking the passage of lithium ions and reducing the ionic conductivity of the separator , thereby increasing the internal resistance of the battery and causing the formation of lithium ions. Battery performance is reduced, especially with thick layers of separator glue.
Ceramic diaphragm. On the original lithium battery separator, aluminum oxide, binder and deionized water are mixed and stirred to form a suspension, and a micro-etching extrusion coating method is used to make a layer of ceramic on the base separator or one layer on each side. noodle.
The thickness is 2 to 4 microns. Ceramic separator increases mechanical strengthe of the original film and the battery has excellent performance in high temperature resistance, puncture resistance and reduced thickness. At the same time, breathability is not affected, thereby improving safety.
Advantages of high purity oxidized saw diaphragm (VK-L30G):
1. High temperature resistance:
Oxidation. The aluminum coating has excellent high temperature resistance and can maintain the diaphragm shape above 180 degrees Celsius.
2. High safety:
Alumina coating can neutralize free ions in the electrolyte, improve the acid resistance of the battery and improve safety.
3. High rate performance:
Nano aluminum oxide can form a solid solution in the bonding battery to improve the rate capacity and cycle performance.
4. Good wettability:
The poNano-alumina powder has good liquid absorption and retention capabilities.
5. Unique Self-Shutoff Features:
Maintains the closed cell characteristics of the polyolefin separator to prevent safety hazards caused by thermal runaway.
6. Low self-discharge rate:
The alumina coating has a new micropore tortuosity, and the self-discharge is lower than that of ordinary separators.
7. Long service life:
Reduces mechanical micro-short circuits during cycling, effectively improving service life.
Lithium-ion battery process technology is very strict and complex. We can only briefly present some of the main processes here. (1) Special solvents and binders are used for mixing sludge with powder positive and negative electrode active materials respectively, and after uniform mixing at largee speed, mud-type positive and negative electrode materials are manufactured. (2) The coating film evenly covers the prepared slurry on the surface of the metal sheet, dry it to make positive and negative electrode parts respectively. (3) The assembly is placed in the order positive electrode sheet - separator - negative electrode sheet - separator from top to bottom, and is rolled to form the battery pole core. Then the battery is completed by electrolyte injection, sealing and others. process. The assembly process creates the finished battery. (4) The chemical industry uses special battery charging and discharging equipment to carry out charging and discharging tests on finished batteries, inspect each battery, and select qualified finished batteries before leaving the factory.
Lithium battery production --- coating machine
Assembly equipmentof lithium batteries