Briefly describe the dry and wet processing technology of iron-lithium battery diaphragm

Dry process of iron-lithium battery diaphragm dry process can be subdivided into uniaxial stretching process and biaxial stretching process. The dry uniaxial stretching process is a method of processing hard elastic fibers to prepare highly oriented polypropylene or polyethylene films with low crystallinity. In the high-temperature annealing process, a film with high crystallinity is obtained. This film is first stretched at low temperature to form micro-defects, and then at high temperature, the defects are pulled apart to form micro-pores. In the dry biaxial stretching process, by adding β crystal modifiers with nucleation purposes to polypropylene, the difference in density between different phases of polypropylene is used to make the polypropylene change from crystal form to microstructure during the stretching process. hole. At present, more than one-third of my country's output uses the dry double-drawing process, and products occupy a large proportion in the low-end market. Applications: Large-scale lithium-ion power lithium-ion batteries (electric vehicles, electric motorcycles, power tools, large-scale energy storage equipment, large-scale military batteries) iron-lithium battery diaphragm wet processing technology Wet processing technology, also known as phase separation method or Thermally induced phase separation method, wet process mixes liquid hydrocarbons or some small molecular substances with polyolefin resin, heats and melts to form a uniform mixture, then cools down for phase separation, presses the membrane, and then heats the membrane to close Melting point temperature, biaxial stretching to align the molecular chains, and finally keeping the temperature for a certain time, eluting the residual solvent with volatile substances to prepare interpenetrating microporous membrane materials. The wet processing technology can not only prepare interpenetrating microporous membrane materials, but also the processed power iron-lithium battery separator has higher longitudinal and lateral strength. At present, the wet processing technology is mainly used to process single-layer lithium battery separators. Application range: high-performance lithium batteries, etc. In terms of physical and mechanical properties, the dry uniaxial stretching process has more advantages. However, the lithium battery separator processed by the wet processing technology has high porosity and good air permeability, which can meet the requirements of high current charging and discharging of power lithium ion batteries. Disclaimer: Some pictures and contents of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How can I extend the service life of the battery pack in the UPS?