What are the 6LR61 battery separator processes? What are the product performance requirements?

　　(1) Product classification

　　Lithium-ion battery separators, positive electrode materials, negative electrode materials and electrolytes are the most important materials that make up lithium-ion batteries. The interior of the lithium-ion battery adopts a spiral winding structure, which requires very fine and highly permeable film isolation materials to be separated between the positive and negative electrodes. The specific structure is shown in the figure below:

　　At present, the large-scale commercial production materials for lithium-ion battery separators are mainly polyolefins, mainly including polypropylene (PP), polyethylene (PE), polypropylene (PP) and polyethylene (PE) composite materials. Polyolefin can provide good mechanical properties, chemical stability and high-temperature self-closing properties, and is the main raw material for current lithium-ion battery separators. The specific classification of separators according to different characteristics is as follows:

　　(2) Product functions

　　The lithium-ion battery separator has a large number of zigzag micropores, which can ensure the free passage of electrolyte ions to form a charge and discharge circuit; when the battery is overcharged or the temperature rises, the separator uses the closed hole function to separate the positive and negative electrodes of the battery to prevent them from directly Contact and short circuit can block current conduction and prevent the battery from overheating or even exploding. The specific functions of the diaphragm are as follows:

　　(3) Product performance

　　Since the performance of the lithium-ion battery separator determines the capacity, cycle performance, charge and discharge current density and other key characteristics of the lithium-ion battery, the separator is required to have appropriate thickness, ion permeability, pore size and porosity and sufficient chemical stability. properties, thermal stability and mechanical stability. details as follows:

　　(4) Product technology

　　The many characteristics that lithium-ion battery separators need to possess put forward special requirements for its production process, which includes raw material formula and rapid formula adjustment, micropore preparation technology, and independent design of complete sets of equipment. Among them, micropore preparation technology is the core of the lithium-ion battery separator preparation process, which is divided into dry uniaxial stretching, dry biaxial stretching and wet processes.

　　The foreign dry one-way stretching technology is mainly developed and mastered by the American Celgard Company. Japan Ube partially purchased this technology from the American Celgard Company. After years of development, this technology has become very mature in the United States and Japan; domestic dry one-way stretching technology The stretching technology was independently developed by Xingyuan Materials in 2008 and obtained the corresponding patented technology; the dry biaxial stretching technology is a process independently developed by the Institute of Chemistry, Chinese Academy of Sciences; the wet process technology was first proposed by Asahi Kasei of Japan. The main details of each process are as follows:

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