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For example, when the internal temperature of the battery is around 60 for charging and discharging, the electrode will repeatedly expand and contract. Under the influence of repeated contraction stress, the porosity of the PP/PE gap will gradually decrease. But when using PET non-woven fabric, its glass transition temperature is above 80, which does not soften with increasing temperature, while maintaining a stable porosity, making the cycle life of lithium-ion batteries longer.
Non woven materials have the advantages of high temperature resistance and high porosity. In addition, due to its three-dimensional pore structure, it can effectively prevent short circuits caused by acupuncture and improve retention rate.
Microporous polyolefin membranes are widely used in lithium-ion batteries, with uniform pores and a thickness of only 20 meters. This gap experienced a significant contraction after 150 years. Many companies add ceramic coatings to the surface to improve heat resistance. Foreign companies have adopted the wet coating process, where the coating surface is coated with non-woven fabrics with a ceramic layer. The gap in 220 years is still not only high in safety, but also because the ceramic particles in the coating have a longer cycle life after being covered. Compared with microporous barriers, non-woven fabrics coated with ceramics have better wettability and electrolyte ion conductivity.
Detailed application of non-woven fabric gaps
The thickness of non-woven fabric cannot be very thin. The thinnest non-woven barrier that can currently be mass-produced is made of cellulose, with a thickness of 12-15× m. Minimizing aperture is difficult to achieve.
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