Lithium ion battery composite membrane and preparation method thereof
A lithium-ion battery and composite diaphragm technology, which is applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of complex process and difficult control of process conditions, and achieve simple process, excellent thermal stability, and improved thermal stability. sexual effect
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[0030] Example 1
[0031] Preparation of positive electrode sheet:
[0032] Lithium cobaltate (positive electrode active material), conductive agent superconducting carbon (Super-P), and binder polyvinylidene fluoride (PVDF) are mixed uniformly at a mass ratio of 96:2.0:2.0 to make a positive electrode slurry. Coated on the current collector aluminum foil, and then dried at 110 ℃, cold pressing, slitting, trimming, and tab welding are performed to make the positive electrode sheet of the lithium ion battery.
[0033] Preparation of negative electrode sheet:
[0034] Graphite and conductive agent superconducting carbon (Super-P), thickener sodium carboxymethyl cellulose (CMC), binder styrene butadiene rubber (SBR) are made into negative electrode slurry at a mass ratio of 96:1.5:1.0:1.5 Coating the slurry on the copper foil of the current collector, and then drying at 85°C, cold pressing, slitting, trimming, and tab welding are carried out to make a lithium ion battery negative sheet....
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[0041] Example 2
[0042] The difference from Example 1 is the preparation of the composite diaphragm:
[0043] Preparation of composite diaphragm:
[0044] 1) Take a polyethylene microporous film with a thickness of 9 μm as the diaphragm substrate;
[0045] 2) Add polyoxyethylene and styrene-butadiene to deionized water and stir for 2h at 50°C, where the mass ratio of polyoxyethylene and styrene-butadiene is 92:8, agglomerate into large particles Suspension dispersion; then add ZrO 2 The particles were stirred for 1 hour, and then added to the polyacrylate emulsion (the content of polyacrylate in the aqueous solution was 25wt%) and the stirring was continued for 1 hour, where ZrO 2 The mass ratio to polyacrylate is 85:15, ZrO 2 The mass ratio to polyoxyethylene is 60:40 to obtain a mixed slurry of inorganic particles and binding polymer, and the solid content of the mixed slurry is 40 wt%;
[0046] 3) The mixed slurry obtained in step 2) is coated on both sides of the diaphragm substr...
Example Embodiment
[0048] Example 3
[0049] The difference from Example 1 is the preparation of the composite diaphragm:
[0050] Preparation of composite diaphragm:
[0051] 1) Take a polyethylene microporous film with a thickness of 9 μm as the diaphragm substrate;
[0052] 2) Add polymethyl methacrylate and styrene-butadiene to deionized water and stir for 2h at 40°C. The mass ratio of polymethyl methacrylate and styrene-butadiene is 94: 6. Agglomerate into a large particle suspension dispersion; then add boehmite particles and stir for 1 hour, then add sodium carboxymethyl cellulose and continue stirring for 1 hour, where the mass ratio of boehmite to sodium carboxymethyl cellulose is 90:10, the mass ratio of boehmite to polymethyl methacrylate is 70:30, and a mixed slurry of inorganic particles and binding polymer is obtained. The solid content of the mixed slurry is 45% by weight;
[0053] 3) The mixed slurry obtained in step 2) is coated on one side of the diaphragm substrate by screen printing,...
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