The micropore preparation technology is the core of the preparation process of the lithium ion battery separator, and is divided into a dry uniaxial stretching, a dry biaxial stretching and a wet process. Lithium-ion battery separators, cathode materials, anode materials and electrolytes are the most important materials for lithium-ion batteries. The inside of the lithium-ion battery adopts a spiral wound structure, and a very fine and highly permeable thin film insulation material is required to be spaced between the positive and negative electrodes. The specific structure is as follows: At present, large-scale commercial lithium-ion battery separator production materials are mainly polyolefin, mainly including polypropylene (PP), polyethylene (PE), polypropylene (PP) and polyethylene (PE) composite materials. Polyolefins provide good mechanical properties, chemical stability and high-temperature self-closing properties. They are the main raw materials for current lithium-ion battery separators. The specific classification of membranes according to different characteristics is as follows: The lithium ion battery separator has a large number of tortuous micropores, which can ensure that the electrolyte ions pass freely to form a charge and discharge circuit. When the battery is overcharged or the temperature rises, the separator separates the positive and negative electrodes of the battery by the closed hole function to prevent direct Contact and short circuit, to block the conduction of current, to prevent the battery from overheating or even exploding. The specific function of the diaphragm is as follows: Because the performance of lithium ion battery separator determines the key characteristics of lithium ion battery capacity, cycle performance, charge and discharge current density, etc., the diaphragm needs to have appropriate thickness, ion permeability, pore size and porosity, and sufficient chemical stability. Properties such as properties, thermal stability and mechanical stability. details as follows: Lithium-ion battery separators need to have many characteristics, and put forward special requirements for their production process, and the production process includes raw material formula and rapid formula adjustment, micro-hole preparation technology, and independent design of complete equipment. Among them, the 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 processing. The foreign dry uniaxial stretching technology is mainly developed and mastered by Celgard Company of the United States. Japan Ube purchased part of the technology from Celgard Company of the United States. After years of development, the technology is very mature in the United States and Japan; The stretching technology was independently developed by Xingyuan Material in 2008 and obtained the corresponding patented technology; the dry biaxial stretching technology is a self-developed process researched by the Institute of Chemistry of the Chinese Academy of Sciences; the wet process technology was first proposed by Asahi Kasei of Japan. The main conditions of each process are as follows: Monocrystalline silicon is an infrared material with excellent comprehensive cost performance. It can be divided into transmission grade and mirror grade. As a transmission grade material, optical grade Czochralski silicon (OCZ SI) is widely used in the mid infrared (1-6um) band, with an infrared transmittance of more than 50%. Zone fused monocrystalline silicon can be used in wider band (1-14um), and high-purity zone fused monocrystalline silicon (hpfz SI) can even be used in far-infrared band (greater than 30um).
Silicon single crystal is also an excellent laser mirror material. Compared with other mirror materials such as copper and molybdenum, silicon single crystal is the preferred substrate material for CO2 laser mirror because of its good thermal conductivity, excellent thermal stability, low coefficient of thermal expansion, relatively low density, low cost and easy precision processing.
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