Battery separator, preparation method thereof, and lithium battery
A battery diaphragm and base film technology, which is applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of poor safety of the diaphragm, limited blocking effect, and poor blocking effect of blocking materials, so as to improve safety, Reduce waste without compromising breathability
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[0050] In the preparation method of the present invention, the above-mentioned several kinds of microspheres have relatively stable melting points and are easy to form microspheres and enter the pores of the base film. Moreover, the air permeability of the composite membrane obtained in this way will not be affected.
[0051] According to the method of the present invention, the manner of said coating is not specifically limited, for example, any one of brushing method, spraying method (high pressure airless spraying method and electrostatic spraying method), dipping method and electrophoretic coating method can be used. One, which can be familiar to those skilled in the art, will not be repeated here.
[0052] According to the method of the present invention, preferably, the ceramic layer has a thickness of 2 μm, and the polymer coating has a thickness of 2-8 μm. Wherein, the thickness of the ceramic layer and the polymer coating can be selected from any thickness point valu...
Embodiment 1
[0061] In Example 1, high-density polyethylene wax latex + oxidized polyethylene wax latex + polypropylene wax latex is applied layer by layer.
[0062] Prepare the battery separator, the steps are as follows:
[0063] Use PE film (the diaphragm produced by our company in industrialized mass production) as the base film, coat ceramic material on one side, and then dry it for use.
[0064] 500g high-density polyethylene wax latex (melting point is 125°C, particle size is 0.6μm), 500g oxidized polyethylene wax latex (melting point is 137°C, particle size is 0.5μm), 500g polypropylene wax latex (melting point is 153°C , with a particle size of 0.4 μm) were diluted to 10% solid content by weight, and ceramic diaphragm coating equipment was used to coat high-density polyethylene wax latex on the reverse side of the ceramic layer, and the coating thickness was controlled to be 2 μm. Use an oven to bake and roll (moving speed is 20m / min). Then coat the oxidized polyethylene wax lat...
Embodiment 2
[0067] In this embodiment, high-density polyethylene wax latex + polypropylene wax latex is coated layer by layer.
[0068] Prepare the battery separator, the steps are as follows:
[0069] Use PE film (the diaphragm produced by our company in industrialized mass production) as the base film, coat ceramic material on one side, and then dry it for use.
[0070] Dilute 500g of high-density polyethylene wax latex (melting point of 125°C, particle size of 0.6μm) and 500g of polypropylene wax latex (melting point of 153°C, particle size of 0.4μm) to a solid content of 10% by weight, using a ceramic diaphragm Coating equipment, first coat high-density polyethylene wax latex on the reverse side of the ceramic layer, control the coating thickness to 2.5 μm, and then use an oven to bake and roll at 60°C (moving speed is 20m / min); then coat Cover with polypropylene wax latex, control the coating thickness to 2.5 μm, and then use an oven to bake and wind at 60°C (travel speed: 20m / min)....
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Abstract
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