What is the difference between the new lithium battery non-woven fabric separator and the traditional lithium battery separator?

The difference between the new lithium battery non-woven membrane and the traditional lithium battery membrane The difference between the new lithium battery and the traditional lithium battery. Lithium gaps include polyolefin gaps and non-woven fabric gaps. The basic characteristics of some non-woven gaps, especially compared with traditional PPPE gaps, have advantages, and their resolution should have a place for the gap data of future use of lithium batteries. Now, many battery manufacturers have shown a keen interest in non-woven gaps. In recent years, with the vigorous development of the lithium battery industry, the market has increasingly higher demand for lithium battery functions. A series of problems such as the safety of lithium batteries, high-power charging and discharging, and improving battery life have also emerged. The corresponding upgrade of the various data of lithium batteries will become a breakthrough to solve these problems. The separation of non-woven fabrics is expected to become an important direction for upgrading the existing polyolefin separation technology. First of all, in terms of data, both PP/PE and non-woven fabrics use polymer data at different glass transition temperatures. In short, the glass transition temperature of polypropylene/polyethylene is lower than normal. As the temperature increases, the film information will become softer and softer. For example, when the internal temperature of the battery is charged and discharged at about 60, the electrode will repeatedly expand and contract. Under the influence of repeated contraction stress, the porosity of the PP/PE gap will gradually decrease. However, when using PET non-woven fabric, its glass transition temperature is above 80, and it will not become soft with the increase of temperature, while maintaining a stable porosity, so that the cycle life of the lithium battery is longer. Non-woven materials have the advantages of high temperature resistance and high porosity. In addition, due to its three-dimensional hole structure, it can effectively prevent short circuits caused by acupuncture and improve the retention rate. Microporous polyolefin membranes are widely used in lithium batteries with uniform pores and a thickness of only 20 meters. This gap has shrunk greatly after 150 years. Many companies add ceramic coatings to the surface to improve heat resistance. Foreign companies have adopted a wet coating process to coat non-woven fabrics with a ceramic layer on the surface. The gap in 220 years is still not only a high level of safety, because the coated ceramic particles will increase the cycle life after being covered. Compared with porous barriers, non-woven fabrics coated with ceramics have better wettability and ionic conductivity of electrolytes. Detailed application of the gap of the non-woven fabric The thickness of the non-woven fabric cannot be very thin. At present, the thinnest non-woven fabric barrier that can be processed in batches is made of cellulose, with a thickness of 12-15×m, and it is difficult to achieve miniaturization of the pore size. In addition, if you want to add a closed hole function, you can add another 2-3 yuan/square meter. However, energy storage and power lithium batteries should not be added with a closed battery function. Therefore, the gap of the non-woven fabric is suitable for large batteries, and is most suitable for large and long-period energy storage and power lithium-ion batteries. At present, the gap of non-woven fabrics is still in the small batch processing stage and has not been used in large quantities. However, many battery manufacturers have shown great interest in this, and some are in the process of piloting. Regarding the cost of non-woven gaps, generally speaking, the price of PET fiber is 20-150 yuan/kg, and the most expensive is 600 yuan/kg or more. PI fiber is 30-50 yuan/kg. The cost of non-woven lithium battery fiber gap is more than half. 1 square meter uses 10g fiber. The cost of general fiber is about 0.2-1.5 yuan/square meter, which is basically the same as the traditional cost. The cost of using microfiber is about It is 5-6 yuan per square meter. Therefore, the cost of separating non-woven fabrics varies according to the changes in fiber composition. The cost of using coarse fibers is very low, and the cost of using nano-sized fibers is very high. There are many ways to reduce costs, such as improving processing power, improving yield, improving existing processing technology, and not blindly pursuing excessive thickness. Conclusion: The isolation information of lithium batteries can be divided into woven membranes, non-woven membranes (non-woven fabrics), microporous membranes, composite membranes, separator paper, roller membranes and other categories. At present, domestic and foreign companies have achieved many results in the research and application of non-woven fabric separation and function optimization, but there are no successful cases of large-scale commercial application of lithium batteries. 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 are the disadvantages of lithium-air batteries?