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Current manufacturing difficulties and solutions for non-woven diaphragms
by：Sunshine
2021-04-06
At present, the biggest difficulty of non-woven diaphragms is mainly the problem of low production efficiency caused by hardware equipment. The production speed of the traditional diaphragm is about 30-50 meters per minute, assuming that the traditional diaphragm production speed is 60-100 square meters per minute when the width is 2 meters, and the production speed is 100-150 square meters per minute when the width is 3 meters. The maximum spinning speed can reach 200 square meters per minute.
In order to achieve such production efficiency, one of the solutions that can be solved is that Professor Jin Yishui of Shinshu University in Japan developed a method for continuous film formation using electrospinning technology. The body width is 3.8 meters and the length is Electrospinning equipment over 80 meters can greatly improve the mass production efficiency of electrospinning, and it is also suitable for the production of other types of non-woven diaphragms.
In terms of cost, the manufacturing process needs to use matching fibers according to the pore size, thickness, and uniformity of the diaphragm. Generally speaking, the finer the fiber, the higher the cost. The cost of PET fiber with nanometer diameter is more than 10,000 yen/kg (RMB 600/kg). If this grade of fiber is used as the material of the non-woven diaphragm, the cost is about 100 yen (about 6 yuan) per square meter or more.
Another method is to grind the existing fibers to be finer. This method has been applied to the manufacture of supercapacitor diaphragms. The fiber grinding method can also be applied to lithium batteries, but it is necessary to decide whether to apply a ceramic coating according to the specific situation. I believe that more technologies will be applied to this field in the future.
In order to achieve such production efficiency, one of the solutions that can be solved is that Professor Jin Yishui of Shinshu University in Japan developed a method for continuous film formation using electrospinning technology. The body width is 3.8 meters and the length is Electrospinning equipment over 80 meters can greatly improve the mass production efficiency of electrospinning, and it is also suitable for the production of other types of non-woven diaphragms.
In terms of cost, the manufacturing process needs to use matching fibers according to the pore size, thickness, and uniformity of the diaphragm. Generally speaking, the finer the fiber, the higher the cost. The cost of PET fiber with nanometer diameter is more than 10,000 yen/kg (RMB 600/kg). If this grade of fiber is used as the material of the non-woven diaphragm, the cost is about 100 yen (about 6 yuan) per square meter or more.
Another method is to grind the existing fibers to be finer. This method has been applied to the manufacture of supercapacitor diaphragms. The fiber grinding method can also be applied to lithium batteries, but it is necessary to decide whether to apply a ceramic coating according to the specific situation. I believe that more technologies will be applied to this field in the future.
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