Ceramic diaphragm for lithium ion battery and preparation method of ceramic diaphragm
A lithium-ion battery, ceramic separator technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of limited liquid absorption capacity, weak binding force between ceramic particles and binders, and easy to fall off powder. Enhanced stability, enhanced binding force, and the effect of preventing powder drop
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[0038] The preparation method of porous aluminum oxide in the present invention is as follows:
[0039] A 1g / L CTAB (hexadecyltrimethylammonium bromide) aqueous solution was used to prepare 18% aluminum nitrate solution and 8% ammonium bicarbonate solution. The ammonium bicarbonate solution was slowly added dropwise to the aluminum nitrate solution and quickly stirred to form a sol. After standing for a period of time, the sol was vacuum dried to obtain a white powder. The white powder was calcined at 550°C for 2 hours to obtain porous aluminum oxide. . The prepared porous aluminum oxide has a particle size of about 100nm and a specific surface area of 432m 2 / g.
[0040] The preparation method of porous silica in the present invention is as follows:
[0041] Add 2g of CTAB, 10g of 32% ammonia water, and 50g of absolute ethanol to 50mL of deionized water, stir and mix well, add 3.6g of ethyl orthosilicate, stir for 2 hours, filter the white precipitate and wash with deionized wat...
Example Embodiment
[0042] Example 1
[0043] 1. The 1g particle size is about 100nm and the specific surface area is 432m 2 / g of porous aluminum oxide powder, 0.3g of polyvinylidene fluoride (PVDF) and 7.5g of N-methylpyrrolidone (NMP) are mixed uniformly to obtain a ceramic coating slurry.
[0044] 2. The ceramic coating slurry is uniformly coated on one side of a polyethylene (PE) membrane with a thickness of 20μm through a coating machine, and dried in a vacuum (vacuum 0.01MPa) at 80°C to form a coating thickness of 3μm The ceramic diaphragm A1.
Example Embodiment
[0045] Example 2
[0046] 1. The 1.5g particle size is about 200nm and the specific surface area is 576m 2 / g of porous silica powder, 0.1 g of sodium carboxymethyl cellulose (CMC), 0.1 g of styrene butadiene rubber (SBR) and 8 g of deionized water are mixed uniformly to obtain ceramic coating slurry.
[0047] 2. The ceramic coating slurry is uniformly coated on one side of a polypropylene (PP) membrane with a thickness of 20μm through a coating machine, and dried under vacuum (vacuum 0.01MPa) at 80°C to form a coating thickness of 4μm The ceramic diaphragm A2.
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