What new type of lithium ion battery separator material

Is there any new type of lithium-ion battery diaphragm material material 1: PMIA PMIA is an aromatic polyamide with a benzamide-type branch on its skeleton, and has a thermal resistance of up to 400 ℃. Due to its high flame retardant performance, this material is used The diaphragm can improve the safety performance of lithium-ion batteries. 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. Make it have the prospect of commercialization. Material 2: PET Polyethylene terephthalate (PET) is a material with excellent mechanical properties, thermodynamic properties, and electrical insulation properties. The most representative product of PET separators is a composite membrane coated with ceramic particles and developed by Degussa in Germany. 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 membrane, 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 better than Celgard separator. The porous fiber structure of PET separator remains stable after 50 cycles of battery cycle. Material 3: PBO The new polymer material PBO is an organic fiber with excellent mechanical properties, thermal stability and flame retardancy. Its matrix is u200bu200ba linear chain structure polymer, which does not decompose below 650°C, has ultra-high strength and modulus, and is an ideal heat-resistant and impact-resistant fiber material. Because the surface of the PBO fiber is extremely smooth and the physical and chemical inertness is extremely strong, it is difficult to change the fiber morphology. PBO fiber is only soluble in 100% concentrated sulfuric acid, methanesulfonic acid, fluorosulfonic acid, etc. After strong acid etching, the fibrils on the PBO fiber will be peeled off from the backbone, forming a split filament morphology, and improving the ratio. Surface area and interface bond strength. Material 4: PI polyimide (PI) is also one of the polymers with good comprehensive properties, with excellent thermal stability, high porosity, and good high temperature resistance, which can be at -200~300℃ Under long-term use. Due to the strong polarity of PI and good wettability to the electrolyte, the manufactured diaphragm exhibits the best liquid absorption rate. Compared with the Celgard diaphragm, the PI diaphragm made by electrospinning has lower impedance and higher rate performance, and the capacity retention rate is still 100% after 100 cycles of charging and discharging at 0.2C. 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 article: Introduction to drone battery knowledge points