Aluminum oxide ceramic diaphragm and preparation method thereof, powder, ceramic slurry and lithium battery
A technology of alumina ceramics and alumina powder, which is applied in the fields of powder, ceramic slurry, alumina ceramic diaphragm and its preparation method, and lithium batteries, and can solve problems such as core pulling and large roughness of ceramic coatings, and achieve improved The effect of battery quality, avoiding core pulling phenomenon, and reducing roughness
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[0031] As mentioned, see figure 1 , the invention provides a method for preparing an alumina ceramic diaphragm with low roughness, comprising: preparing alumina ceramic slurry; coating the alumina ceramic slurry on the surface of the base film, and drying to form an alumina ceramic coating .
[0032] Optionally, the alumina ceramic slurry is suitable for preparation in the following manner: mixing the aforementioned alumina powder, dispersant, binder, thickener, wetting agent, solvent and other raw materials, using Double planetary or sand mill for high-speed dispersion, uniform dispersion to form alumina ceramic slurry.
[0033] As mentioned above, the present invention provides a lithium battery, comprising: a diaphragm; the diaphragm adopts the aforementioned alumina ceramic diaphragm.
[0034] the second part:
Embodiment 1
[0036] (1) Digestion reaction
[0037] First select 100kg of α-alumina powder with a particle size of D50 = 0.9 μm and a purity of 99.9%; put the α-alumina powder into a strong alkali solution with a concentration of 80% to digest the burrs and protrusions on the surface of the alumina. The time is 5 minutes; the reacted alumina powder is washed and dried to form a burr-free alumina powder.
[0038] (2) Preparation of alumina ceramic slurry
[0039] First add 40.0kg of pure water to the mixing tank, then add 0.093kg of sodium salt dispersant for stirring and dispersing; then add 19.0kg of burr-free alumina powder for stirring and dispersing; then add 0.48kg of carboxymethacrylic acid The sodium solution was stirred and sand-milled; then 1.55kg of acrylic binder was added and stirred; and 1.56kg of wetting agent solution was added, stirred and dispersed to prepare alumina ceramic slurry.
[0040] (3) Coating
[0041] The alumina ceramic slurry is coated on the 12 μm PE film ...
Embodiment 2
[0043] (1) Digestion reaction
[0044] First select 100kg of α-alumina powder with a particle size of D50=0.1μm and a purity of 99%; put the α-alumina powder into a 20% concentration of strong alkali solution for digestion of burrs and protrusions on the surface of alumina, and digestion The time is 20 minutes; the reacted alumina powder is washed and dried to form burr-free alumina powder.
[0045] (2) Preparation of alumina ceramic slurry
[0046] First add 26kg of pure water to the mixing tank, then add 0.082kg of sodium salt dispersant for stirring and dispersing; then add 20kg of burr-free alumina powder for stirring and dispersing; then add 0.2kg of sodium carboxymethacrylate solution , carry out stirring and sand grinding; then add 1.82kg of acrylic binder and stir; then add 0.064kg of wetting agent solution, stir and disperse to make alumina ceramic slurry.
[0047] (3) Coating
[0048]The alumina ceramic slurry is coated on the 12 μm PE film to form an alumina cera...
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Abstract
Description
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