Production process of lithium iron battery separator -Lithium - Ion Battery Equipment
The production process of Fe-Li-ion battery separator is mainly divided into dry stretching and wet stretching. The many characteristics of lithium-ion battery separators have put forward special requirements for their production process, and the production process includes raw material formula and rapid formula adjustment, micropore preparation technology, independent design of complete sets of equipment and other processes.
Wet production process, also known as phase separation method or thermally induced phase separation method, the wet process mixes liquid hydrocarbons or some small molecular substances with polyolefin resin, after heating and melting, a uniform mixture is formed, and then the temperature is lowered for phase separation and pressing. The film is obtained, and then the film is heated to a temperature close to the melting point, and the molecular chain is oriented by biaxial stretching, and then kept for a period of time, and the residual solvent is eluted with volatile substances to prepare the interconnected microporous film material.(Lithium - Ion Battery Equipment)
The wet production process can not only prepare interconnected microporous membrane materials, but also produce lithium-ion battery separators with high longitudinal and lateral strength. At present, wet production processes are mainly used to produce single-layer lithium-ion battery separators.
The dry uniaxial stretching process is a method of producing hard elastic fibers to prepare high-oriented polypropylene or polyethylene films with low crystallinity, and high crystallinity films are obtained during high temperature annealing. The 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. At present, more than one-third of my country's production uses the dry double-drawing process, and the products occupy a large proportion in the low-end market.
Wet production process, also known as phase separation method or thermally induced phase separation method, the wet process mixes liquid hydrocarbons or some small molecular substances with polyolefin resin, after heating and melting, a uniform mixture is formed, and then the temperature is lowered for phase separation and pressing. The film is obtained, and then the film is heated to a temperature close to the melting point, and the molecular chain is oriented by biaxial stretching, and then kept for a period of time, and the residual solvent is eluted with volatile substances to prepare the interconnected microporous film material.(Lithium - Ion Battery Equipment)
The wet production process can not only prepare interconnected microporous membrane materials, but also produce lithium-ion battery separators with high longitudinal and lateral strength. At present, wet production processes are mainly used to produce single-layer lithium-ion battery separators.
The dry uniaxial stretching process is a method of producing hard elastic fibers to prepare high-oriented polypropylene or polyethylene films with low crystallinity, and high crystallinity films are obtained during high temperature annealing. The 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. At present, more than one-third of my country's production uses the dry double-drawing process, and the products occupy a large proportion in the low-end market.
