What are the raw materials for processing lithium battery separators?

What are the raw materials for processing lithium battery separators? ①Polyethylene terephthalate Polyethylene terephthalate (PET) is a material with excellent mechanical properties, thermodynamic properties, and electrical insulation properties. The most representative product of PET separators is the composite film developed by Germany Degussa with PET separator as the base and coated with ceramic particles. It exhibits excellent heat resistance and the closed cell temperature is as high as 220°C. The melting point of the electrospun PET membrane is much higher than that of the PE film, at 255℃, the maximum tensile strength is 12Mpa, the porosity reaches 89%, and the liquid absorption rate reaches 500%, which is much higher than the Celgard membrane on the market, and the ion conductivity reaches 2 ．27×10-3Scm-1, and the cycle performance is also better than Celgard diaphragm, the porous fiber structure of PET diaphragm remains stable after 50 cycles of battery cycle. ②Polyimide Polyimide (PI) is also one of the polymers with good comprehensive properties. It has excellent thermal stability, higher porosity, and better high temperature resistance, which can be in the range of -200 to 300 Long-term use at ℃. Miao et al. used the electrospinning method to manufacture PI nanofiber membranes. The membrane has a degradation temperature of 500°C, which is 200°C higher than that of traditional Celgard membranes. It will not undergo aging and thermal shrinkage at a high temperature of 150°C. ③Meta-aramid PMIA is an aromatic polyamide with metabenzamide-type branches on its skeleton, and has a thermal resistance of up to 400°C. Due to its high flame retardancy, the diaphragm using this material can improve lithium batteries The safety performance. In addition, due to the relatively high polarity of the carbonyl group, the separator has high wettability in the electrolyte, thereby improving the electrochemical properties of the separator. 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 post: What kind of serial and parallel lithium iron phosphate battery packs should be paid attention to?