Preparation method of lithium ion battery diaphragm
A lithium-ion battery and diaphragm technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as poor safety performance of the diaphragm
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[0031] The present invention provides a kind of preparation method of lithium-ion battery separator, such as figure 1 As shown, the preparation method at least includes the following steps:
[0032] First, step S1 is performed, mixing the inorganic filler with water and stirring evenly to form a slurry.
[0033] The inorganic filler mainly serves to further enhance the gas permeability of the separator. As an example, in this step, the particle size range of the inorganic filler is 3-5 μm. More preferably, the particle size range of the inorganic filler is 3-4 μm.
[0034] As an example, in this step, the mass ratio of the inorganic filler to water is (20-25): (25-30). Preferably, the mass ratio of the inorganic filler to water is 20:28 or 21:26.
[0035] As an example, in this step, the inorganic filler is selected from one or more combinations of alumina, boehmite or magnesia, and of course, other suitable materials can also be selected as the inorganic filler, here unl...
Embodiment 1
[0055] 1. Weigh 20Kg of alumina powder with a particle size of 3 μm, add it into 25Kg water and stir fully to form an alumina aqueous solution, add 1.3Kg of sodium hexametaphosphate aqueous solution with a solid content of 35%, fully grind and stir for 30min, so that the particle size The diameter range is between 0.5-3μm, then add 4kg of water-based binder, stir evenly, and make a ceramic slurry with a solid content of 45%;
[0056] 2. Take a base film with a thickness of 9 μm, and use the gravure roller coating method to evenly coat the prepared ceramic slurry on the base film. The coating speed is 75m / min. After coating, the coated film directly enters the fifth section Oven for drying, the oven temperature of each level is 80 ° C, 80 ° C, 85 ° C, 85 ° C, 85 ° C, after drying, you can get a ceramic-coated lithium-ion battery separator (ceramic slurry coating surface density is relatively high , 23g / ㎡), the thickness of the lithium-ion battery separator is 9 μm, and the coat...
Embodiment 2
[0059] 1. Weigh 21Kg of alumina powder with a particle size of 4 μm, add it to 26Kg of water and stir fully to form an alumina aqueous solution, add 1.3Kg of sodium tripolyphosphate aqueous solution with a solid content of 35%, fully grind and stir for 30 minutes, so that the particle size The diameter range is between 0.5-3 μm, then add a water-based binder (4kg of hydroxypropyl guar gum with a solid content of 45%) and stir evenly to make a ceramic slurry with a solid content of 45%;
[0060] 2. Take a base film with a thickness of 9 μm, and use the gravure roller coating method to evenly coat the prepared ceramic slurry on the base film. The coating speed is 75m / min. After coating, the coated film directly enters the fifth section Oven for drying, the oven temperature of each level is 80 ° C, 80 ° C, 85 ° C, 85 ° C, 85 ° C, after drying, you can get a ceramic-coated lithium-ion battery separator (ceramic slurry coating surface density is relatively high , 22g / ㎡), the thickn...
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