Lithium ion battery diaphragm and preparation method thereof
A lithium-ion battery and separator technology, applied in the field of preparation of the battery separator, can solve the problems of insufficient flatness and large roughness of the coating separator, and achieve the effects of good flatness, small roughness and reduction of shrinkage cavities
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[0043] Example 1
[0044] Dry coating treatment:
[0045] The silane coupling agent was prepared into a 1% alcohol-water mixed solution (alcohol:water=1:1).
[0046] Put the first and second magnesium hydroxide flake particles into a circulating pneumatic mixer respectively, and mix for 15 hours under the spray environment of the above mixed solution, dry, and take out.
[0047] The coated first and second magnesium hydroxide flake particles are ground and dispersed, and the agglomerated particles are filtered. The average particle size of the first magnesium hydroxide flake particles was measured to be 150nm, the particle size distribution range was (60~450)nm, and the aspect ratio of the flake particles was 1~5; the second magnesium hydroxide flake particles were measured The average particle size is 1 μm, the particle size distribution range is 450 nm to 2.5 μm, and the aspect ratio of the flake particles is 1 to 5.
Example Embodiment
[0048] Example 2
[0049] Wet coating treatment:
[0050] The first and second magnesium hydroxide flake particles were prepared into 6% slurry (water as solvent), stirred in a water bath at 70°C, and 1 part of acrylic acid and 90 parts of inorganic particles were added. 0.1 part of inorganic peroxide and 90 parts of butyl acrylate, coated for 3h, suction filtered, washed, dried, and taken out.
[0051] The first and second magnesium hydroxide flake particles are ground and dispersed respectively, and the agglomerated particles are filtered. The average particle size of the first magnesium hydroxide flake particles was measured to be 150nm, the particle size distribution range was (60~450)nm, and the aspect ratio of the flake particles was 1~5; the second magnesium hydroxide flake particles were measured The average particle size is 1 μm, the particle size distribution range is 450 nm to 3 μm, and the aspect ratio of the flake particles is 1 to 5.
Example Embodiment
[0052] Example 3
[0053] The inorganic particles treated in Example 1 were used.
[0054] Take 25g of the first magnesium hydroxide flake particles and 60g of the second magnesium hydroxide flake particles, 0.6g PE wax and 1g polysiloxane mixture, 15g acrylonitrile emulsion, 0.75g acrylic leveling agent, 180g water and 45g Ethanol is evenly mixed and dispersed to form a suspension coating slurry.
[0055] The suspension coating slurry is coated on a single side of a 16 μm ultra-high molecular weight polyethylene substrate, and then dried and cured to prepare the lithium ion battery coated separator of the present invention, and the total thickness of the single side coating is 4 μm.
[0056] The measured angle arrangement range of magnesium hydroxide flake particles is 0~45°; the first magnesium hydroxide flake particles are evenly distributed in the gap of the second inorganic flake particles, and the density is good (see figure 2 ); The appearance of the coating is smooth and flat...
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