Analyze the advantages of the new process of dust-free mixing of lithium batteries

Analysis of the advantages of a new type of lithium battery dust-free slurry technology The present invention relates to a completely dust-free cleaning slurry technology for lithium battery powder active materials, and carries out corresponding intellectual property maintenance layout. Through the powder active material and pulp in the lithium battery process, the corresponding soluble bag is used to pack the powdered lithium battery active material (the outside of the bag is still the traditional aluminum film bag, the soluble bag inside the bag), and the lithium battery pack can dissolve the powder together The solvent used in the pulping process of active materials, and then clean the pulping process, and finally completely prevent dust pollution. In order to promote the electrochemical reaction and reduce the resistance of the electrode reaction, most of the active materials of lithium batteries use powder materials, including negative electrode materials, negative electrode materials, binding materials, conductive materials and so on. The active material of the lithium battery should be mixed with the corresponding solvent (such as NMP or water), mixed loosely (or dissolved) uniformly, and made into a slurry process for the processing of the lithium battery. In the process of mixing the slurry, the small particles guessed by the active substance of the powder temporarily constitute dust pollution and pollute the working environment. Some active powder materials were left at the end of the packaging bag, which also temporarily polluted the working environment. Dust pollution represented by lithium iron phosphate cathode materials and carbon nanotube conductive agents is particularly serious. To this end, the author developed a completely clean and dust-free lithium battery powder active material slurry technology, and carried out the corresponding intellectual property maintenance layout. Through the powder active material and pulp in the lithium battery process, the corresponding soluble bag is used to pack the powdered lithium battery active material (the outside of the bag is still the traditional aluminum film bag, the soluble bag inside the bag), and the lithium battery pack can dissolve the powder together The solvent used in the pulping process of active materials, and then clean the pulping process, and finally completely prevent dust pollution. The standard 350mmx460mm sleeping bag has a thickness of 40 microns, a weight of 21.76 grams, and a volume of 8 liters. This bag is dissolved in NMP after mixing for 5 minutes at room temperature. The lithium iron phosphate material can hold about 6kg, so the weight ratio of the bag to the lithium iron phosphate is 21.76/6000u003d0.36%. However, the positive formula for improving the PVDF of lithium iron phosphate is 2.5%, that is to say, the PVDF bag is only 14.4% of the total number of PVDF binders, and there is no obvious change, which affects the entire welding effect and does not bring impurities, because PVDF Packing bag and glue are both PVDF materials. Even if the formula reduces the amount of PVDF glue related to the lithium iron phosphate cathode to 1.5%, the PVDF bag glue only accounts for 24% of the total PVDF glue. This kind of soluble packaging bag can actually only supply a short-lived powder leakage film. In the processing practice, the strength of the primary packaging is supplied by the aluminum-plastic film packaging, with a thin layer of soluble PVDF bag inside the film. Regarding NCA and NCM materials, a standard 350mmx460mm PVDF bag with a thickness of 80 microns, a weight of 43.52g and a volume of 8 liters is required. It can hold about 17 kilograms of NCA and NCM anode materials. This bag is dissolved in NMP after mixing for 5 minutes at room temperature. The weight ratio of the positive PVDF bag is 43.52/17000u003d0.26%. However, the three components of the new positive PVDF formula related to the cathode material is 1.5%, that is to say, only 17.3% of the PVDF bag is related to the entire PVDF binder, which has no obvious effect on the entire welding effect and will not bring impurities , Because the PVDF bag is made of PVDF material. Even if the amount of PVDF glue related to the positive electrode is reduced to 1.0%, the PVDF bag glue only accounts for 26% of the total PVDF glue. Now, the use of soluble PVDF encapsulation process to process conductive carbon black (temicro's SP), conductive graphite (temicro's ks-6), carbon nanotubes and PVDF adhesive itself, there are big differences. The influence of PVDF bags on these materials is completely negligible. Regarding the charging of the conductive agent SP, the dust is very serious, and soluble packaging bag technology is urgently needed to improve the charging operating environment. This effect is successful and has no side effects. Conductive carbon black SP sold thousands of tons in China last year. This technology is also suitable for cathode materials, and it is better to use water-soluble polymer materials as the material for the packaging bag. 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: Analysis of charging habits that damage battery life