What film thickness coating rod is used for lithium battery separator? [Hot selection]

Lithium-ion batteries are recyclable rechargeable batteries, which are more and more widely used in home appliances, automobiles, and equipment. An important part of lithium-ion batteries is the lithium battery diaphragm, the performance of the diaphragm affects the interface structure, internal resistance, capacity, safety performance, etc. of the battery. The thickness of the lithium battery diaphragm will affect the heat dissipation of the battery. Therefore, the national standard GB36363 "Polyolefin Diaphragm for Lithium-ion Batteries" stipulates that the thickness of the diaphragm should be between 16 and 25 μm, because the later diaphragm will affect the heat dissipation of the battery. To ensure a certain mechanical strength, the thinner the diaphragm, the better.

In order to test the performance of the separator, the experimental preparation of the separator is a required link. In common experiments, a coating wire bar is generally used to coat a lithium battery separator slurry on a film to prepare a lithium battery separator. According to the sales experience of NBCHAO, many technical research users prepare lithium battery separators by using coating wire rods less than 10 μm, and scraping wet films of no more than 10 μm for ultra-thin lithium battery coating.

In order to ensure higher coating accuracy, generally the wire Bar Coater below 10μm is selected from imported high-precision rods, such as American RDS and Japanese OSP. Common model specifications are as follows:

Among them, the coating width of RDS bar is 300mm, while the coating width of OSP is 60mm, 250mm and 300mm. The specific rod size of the coating film thickness should be selected according to the rod size required for the actual experimental research. This article only provides a selection reference.

In addition, manual coating of film substrates is more troublesome, and it is difficult to keep the film flat, so it can be coated with a small automatic film coating machine with vacuum adsorption function.