A kind of lithium ion battery safety coating slurry and dispersion method thereof
A lithium-ion battery, coating slurry technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve problems such as long-term stable storage, reduced overall battery performance, and difficulty in drying out moisture. , to improve the overall performance of the battery, increase the suspension performance, and reduce the swelling phenomenon.
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Embodiment 1
[0032] The lithium-ion battery safety coating slurry of the present embodiment is composed of the following components in parts by mass:
[0033] Boehmite 90, polyvinylidene fluoride 10, alkoxyammonium salt of acid group block copolymer 0.1, N-methyl-2-pyrrolidone 140, the dispersion method of its uniform and stable suspension is as follows;
[0034] (1) Preparation of premixed glue: Sprinkle the polyvinylidene fluoride evenly into the weighed N-methyl-2-pyrrolidone, stir for 6 hours at 15 rpm and 1200 rpm in a sealed container, polyvinylidene fluoride Completely dissolved in N-methyl-2-pyrrolidone to obtain a premixed glue solution with a mass concentration of 10%;
[0035] (2) Preparation of anhydrous boehmite material: add the boehmite to the grinding jar, and the grinding time is 0.5h; the particle size D50 of the boehmite after grinding is 100-3000nm, and the ground boehmite is kept at -0.9~- Vacuum degree of 0.85MPa, keep high temperature at 150℃±5℃ and bake for 4h;
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Embodiment 2
[0042] The difference between Example 2 and Example 1 is that the lithium-ion battery safety coating slurry of this example is composed of the following components in parts by mass: boehmite 90, polyvinylidene fluoride 10, acid group block Alkylhydroxyammonium salt of the copolymer 0.1, N-methyl-2-pyrrolidone 550; 15% N-methyl-2-pyrrolidone was added in step (5); other steps were the same as in Example 1.
Embodiment 3
[0050] The difference between Example 3 and Comparative Example 1 is to remedy the slurry with flocculation problems. The slurry in Comparative Example 1, which had been left standing for 10 days in a sealed state and had been phase-separated, was re-added with 1% of the acid group block copolymer. Alkylhydroxyammonium salts. First, stir and disperse for 4 hours according to the revolution of 25 rpm and the rotation of 3500 rpm; then transfer the mixture into the cone mill, and circulate 10 times at a flow rate of 10L / h and a linear speed of 23m / s;
[0051] From the solid content and viscosity change data of Examples 1-3 and Comparative Examples 1-3 figure 1 and figure 2 From the comparison, it can be seen that the solid content of the ceramic slurry prepared by the cycle of ultrasonic and magnetic stirring in Comparative Example 1 without wetting and dispersing agent in Comparative Example 2, magnetic stirring in Comparative Example 2, and magnetic stirring in Comparative E...
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