Preparation method of nanoscale PET material applied to lithium battery non-woven fabric diaphragm

Abstract

The invention discloses a preparation method of a nanoscale PET material applied to a lithium battery non-woven fabric diaphragm, which specifically comprises the following steps that S1, 50-120 partsby weight of a common PET fiber material are weighed, and the common PET fiber material is soaked in nano silica sol for 30-50 minutes; S2, after infiltration is completed, the surface of the commonPET fiber material is evenly coated with the nano silica sol through roller coating, the common PET fiber material is taken out and dried after roller coating is completed, and a layer of silica gel,namely a PET fiber material mixture, is formed on the surface of the dried common PET fiber material. A common PET fiber material is used, infiltration roller coating is carried out in nano silica sol, an organic solvent and inorganic particles are mixed according to a ratio, finally, grinding and sieving are carried out in a planetary ball mill, the nanoscale PET material with uniform particle size distribution can be prepared, the cost required after the nanoscale PET material is processed is about 1.5-2.5 yuan / m<2>, and the processing cost of the nanoscale PET material is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium battery components, in particular to a preparation method of a nanoscale PET material applied to a lithium battery non-woven diaphragm. Background technique [0002] Lithium-ion batteries have gradually replaced traditional lead-acid batteries and nickel-cadmium batteries because of their outstanding advantages such as high specific energy, long cycle life, no memory effect, and environmental protection, and have become the main choice of power batteries. Diaphragms are the key components of lithium-ion batteries , plays an important role in blocking the electron conductance of the positive and negative electrodes in the battery, allowing the electrolyte ions to pass through freely to achieve ion conduction, and is also a key component related to the safety of lithium-ion batteries. The performance of the separator determines the interface structure of the battery and Internal resis...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of the nanoscale PET material that is applied to lithium battery non-woven diaphragm, the present invention carries out impregnation roller coating with common PET fiber material in nano silica sol, and utilizes organic solvent and The preparation of inorganic particles mixed in proportion, and finally grinding and sieving in a planetary ball mill can make nano-scale PET materials with uniform particle size distribution. The cost of nano-scale PET materials after processing is about 1.5-2.5 yuan per square meter, which is greatly improved. The advantage of reducing the processing cost of nano-scale PET materials is that more than half of the cost of non-woven diaphragms is fibers. In the case of using 10g of fibers per square meter, the cost of ordinary fibers is about 0.2-1.5 yuan per square meter, which is basically the same as The cost of traditional diaphragms is roughly the same. If nano-scale fibers are used, the cost is about 5-6 yuan per square meter. Therefore, it is impossible to popularize the application of nano-scale fibers to lithium battery non-woven diaphragms.

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