What is the purpose of coated separators for lithium batteries?

Lithium battery coating diaphragm function, lithium battery diaphragm technology development, lithium battery coating gap effect, lithium battery gap technology development. In recent years, with the development of my country's new energy industry and the continuous progress of lithium battery processing technology, my country's demand for lithium batteries has become increasingly gaping. In recent years, in the market's demand for gaps in lithium batteries, the proportion of coatings has continued to increase, and the compounding of gap data in the future is also an important method for functional progress. The isolation effect of lithium batteries The separation of lithium batteries is called the third pole, and the important use of the comprehensive function of lithium battery separation is embodied in the following three aspects: separating the positive and negative electrodes of the battery. The gap itself is non-conductive, and can block the battery through electrons to prevent the two poles from contacting and form a short circuit; allowing lithium ions to pass through. The micropores in the gap can transfer lithium ions between the positive electrode and the negative electrode, ending the electrochemical charge and discharge process. Prevent high temperature caused by battery explosion. The gap between the overheating of the lithium battery and the closure of the micropores prevents the internal resistance of the lithium battery from increasing to 2k, forcibly suspending the process of battery charging and discharging. The impact of coating on the performance of lithium batteries The coating (or composite) gap is the key gap for development, and the choice of the appearance of the gap has obvious advantages for the coating layer. First, the thermal stability of the air gap is improved. For example, after the ceramic coating, the gap of the high temperature 180 body is still good, which can prevent the gap from shortening and forming an internal short circuit, so that the safety of the battery is significantly improved. Secondly, the penetration of the feed gap into the electrolyte is conducive to the reduction of the internal resistance of the lithium battery and the improvement of the discharge power. Secondly, it can hinder or reduce the gap oxidation, which is conducive to the work of the high-voltage anode and prolongs the cycle life of the lithium battery. The protective coating improves the function of the lithium battery. A good gap has a very important impact on the overall performance of lithium batteries. Its function affects the structure, resistance, capacity, circulation and safety functions of the battery. In particular, the gap's durability, self-closing, and high temperature resistance are the primary guarantees for the internal safety of the battery. Coating technology can improve the comprehensive functions of lithium batteries, and coating can significantly improve functions such as poor high temperature resistance. The wet + coating process not only retains the excellent performance of the wet barrier with high mechanical strength, but also improves the shortcomings of the uncoated wet barrier of low melting point and poor safety, making it more suitable for preparing high energy density power lithium-ion batteries. Lithium battery gap technology development According to reports, this gap is the highest technical barrier in lithium battery data, accounting for about 15% of the cost of lithium batteries. The difficulty lies in the engineering technology, matrix information and manufacturing equipment for making holes. In recent years, my country’s lithium battery gap localization rate is making progress, but it mainly occupies the low-end 3C battery gap market. The high-end gap localization rate is still very low. The barriers to high-end 3C batteries and power lithium-ion batteries are still heavily dependent on imports. At present, there are four gap manufacturing technologies in industrialized processing: wet method, dry method, semi-dry method and non-woven method. With the continuous expansion of domestic shortfall production, the downward trend in prices is irreversible. In our country, there is a common problem with the technique of creating barriers, that is, consistency should be improved. This consistency is mainly reflected in irregular defects, thickness, porosity, pore dispersion and pore dispersion. In terms of porosity and pore size dispersion, the uniaxial stretching gap of domestic PP is close to that of standard products. The interstitial porosity of the two-way stepped PE is generally lower than that of the standard product, and the pore size distribution is not ideal. After statistical analysis of patents, it can be found that although the current industrialization of lithium battery barrier materials is polyethylene and polypropylene, some polymer materials with more and more prominent functions have gradually developed in the laboratory, such as vinylidene fluoride (PVDF). , Polyimide (PI), aramid fiber and cellulose, such as the gap of data types will enter the direction of diversification. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What certification does Amazon battery products pass?