Diaphragm for lithium-ion battery and lithium-ion battery containing diaphragm
A lithium-ion battery and diaphragm technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as blockage of the separator, affecting battery performance, and plugging holes, and achieve the effect of solving deformation and improving battery performance
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[0032] Example 1
[0033] Preparation of positive electrode sheet:
[0034] Lithium cobaltate, conductive carbon, and binder polyvinylidene fluoride were mixed uniformly in N-methylpyrrolidone (NMP) solvent at a mass ratio of 97:1.2:1.8 to make a positive electrode slurry, and then coated on aluminum foil and After drying at 110°C, cold pressing, slitting, trimming, and tab welding are carried out to form a positive electrode sheet.
[0035] Preparation of negative electrode sheet:
[0036] Graphite, conductive carbon, thickener sodium carboxymethyl cellulose, and binder styrene butadiene rubber are mixed uniformly in deionized water at a mass ratio of 96:2.0:1.0:1.0 to make negative electrode slurry, and then coated on copper foil After being applied and dried at 85°C, cold pressing, slitting, trimming, and tab welding are performed to form a negative electrode sheet.
[0037] Preparation of diaphragm:
[0038] 1) Take a polypropylene microporous film with a thickness of 16 μm as the ...
Example Embodiment
[0042] Example 2
[0043] The difference between this embodiment and embodiment 1 is the preparation of the diaphragm:
[0044] 1) Take a polypropylene microporous film with a thickness of 16 μm as the diaphragm body;
[0045] 2) In deionized water, first stir polyvinylidene fluoride-hexafluoropropylene (particle size distribution range of 1.0 ~ 5.0 μm) and polyacrylonitrile (particle size distribution range of 0.1 ~ 0.4 μm) in a polyacrylic acid solution, The weight ratio of vinyl fluoride-hexafluoropropylene: polyacrylonitrile: polyacrylic acid is 10:80:10. The slurry prepared after stirring for 4H, the solid content is 20%, and then the slurry is uniformly prepared by gravure coating The functional coating is formed on one surface of the diaphragm body, and finally cut into pieces. Among them, the thickness of the functional coating is 4 μm, the front projection area of the functional coating accounts for 80% of the front projection area of the diaphragm body, and the area d...
Example Embodiment
[0047] Example 3
[0048] The difference between this embodiment and embodiment 1 is the preparation of the diaphragm:
[0049] 1) Take a polypropylene microporous film with a thickness of 16 μm as the diaphragm body;
[0050] 2) In deionized water, first stir polyacrylonitrile (with a particle size distribution range of 6.0 to 10.0 μm) and polyoxyethylene (with a particle size distribution range of 0.2 to 0.5 μm) in a polyvinylidene fluoride solution. The weight ratio of oxyethylene:polyvinylidene fluoride is 15:75:10, the slurry prepared after stirring for 4H, the solid content is 20%, and then the slurry is uniformly coated on the diaphragm body by gravure coating A functional coating is formed on one surface of the product, and finally cut into pieces. Among them, the thickness of the functional coating is 8 μm, the front projection area of the functional coating accounts for 75% of the front projection area of the diaphragm body, and the area distribution ratio of the supp...
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