Preparation method of special alumina for high-purity lithium battery separation membranes
A lithium battery separator and battery separator technology, which is applied to lithium batteries, chemical instruments and methods, battery pack components, etc. The problem of high cost of elution of sodium, to achieve the effect of controllable crystal microscopic morphology, ideal phase composition, and low cost
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[0038] Example 1:
[0039] A method for preparing aluminum oxide for lithium battery diaphragm (flow chart as figure 1 ), the steps are as follows: aluminum hydroxide material (D 50 =8.1μm, Na 2 O = 0.37%, Fe 2 O 3 = 0.012%, SiO 2 =0.008%, water content 0.40%) and ultrafine aluminum hydroxide seed crystal (D 50 =2.5μm, Na 2 O=0.39%, Fe 2 O 3 =0.011%, SiO 2 =0.0082%, water content 0.45%) According to the mass ratio of 8:1 mixed to obtain the mixture M1, the mixture M1 and ammonia (ammonia water content of 26%) according to the mass ratio of 100:1 mixed to obtain the mixture M2, add Adjust the solid content of soft water to 220g / L; set the reaction temperature of the reactor to 220℃, and the holding time to 2h. After the hydrothermal reaction is completed, filter and dry to obtain boehmite; put the boehmite in a high-temperature furnace, It is calcined at 1200℃ for 3 hours, and then subjected to high-efficiency grinding and spray drying with a horizontal sander to obtain powder, wh...
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[0041] Example 2:
[0042] A preparation method of aluminum oxide for lithium battery diaphragm, the steps are as follows: aluminum hydroxide (D 50 =8.1μm, Na 2 O = 0.37%, Fe 2 O 3 = 0.012%, SiO 2 =0.008%, water content 0.40%) and ultrafine aluminum hydroxide seed crystal (D 50 =2μm, Na 2 O=0.39%, Fe 2 O 3 =0.011%, SiO 2 =0.0082%, water content 0.45%) according to the mass ratio of 8:2 to obtain mixture M1, then, M1 and ammonia (ammonia water content of 26% nitrogen) according to the mass ratio of 100:2 to obtain mixture M2, Add soft water to adjust the solid content to 240g / L; set the reaction temperature of the reactor to 220°C and the holding time to 2h. After the hydrothermal reaction is completed, filter and dry to obtain boehmite; put the boehmite in a high-temperature furnace, Calcined at a high temperature of 1200°C for 3 hours, and then subjected to high-efficiency grinding by jet mill to obtain α-Al 2 O 3 Superfine powder. The parameters of the jet mill are: the batch g...
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[0044] Example 3:
[0045] A preparation method of aluminum oxide for lithium battery diaphragm, the steps are as follows: aluminum hydroxide (D 50 =8.1μm, Na 2 O = 0.37%, Fe 2 O 3 = 0.012%, SiO 2 =0.008%, water content 0.40%) and ultrafine aluminum hydroxide seed crystal (D 50 =2μm, Na 2 O=0.39%, Fe 2 O 3 =0.011%, SiO 2 =0.0082%, water content 0.45%) according to the mass ratio of 8:3 mixed to obtain mixture M1, then, M1 and ammonia (ammonia water nitrogen content of 26%) according to the mass ratio of 100:2 mixed to obtain mixture M2, add Adjust the solid content of the soft water to 250g / L, set the reaction temperature of the reactor to 210°C, and the holding time of 1.5h. After the hydrothermal reaction is completed, filter and dry to obtain boehmite; put the boehmite in a high-temperature furnace. Calcined at a high temperature of 1100℃ for 3 hours, and then subjected to high-efficiency grinding by jet mill to obtain α-Al 2 O 3 Superfine powder. The parameters of the jet mil...
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