Preparation method of heat-resistant high-breathability composite coated diaphragm
A highly breathable and coating technology, applied in electrical components, structural parts, secondary battery repair/maintenance, etc., can solve problems such as unstable diaphragm size, unbalanced internal resistance, battery disintegration, etc., to suppress adverse side reactions , Increase peel strength and heat resistance, improve cycle performance
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Embodiment 1
[0025] (1) Preparation of MOF coating slurry
[0026] Dissolve 0.88g of copper nitrate trihydrate and 0.4g of isophthalic acid in 150mL of ethanol respectively, mix the two after complete dissolution, stir at room temperature for 30-120min or ultrasonically for 20-50min to obtain a precursor dispersion. The resulting dispersion was washed with ethanol and dried in a vacuum oven at 160 °C for 12 h to obtain the MOF product.
[0027] Add MOF and PVDF into NMP at a mass ratio of 2:1, stir and disperse for 60 minutes to obtain a coating slurry.
[0028] (2) Preparation of hydrotalcite coating slurry
[0029] First, mix 60 parts of ultrapure water and 0.5 parts of dispersant evenly according to the mass ratio, then add 30 parts of magnesium aluminum hydrotalcite, and then add 6 parts of thickener after high-speed stirring and mix evenly; Grinding with a sand mill, finally adding 3 parts of binder and 0.1 part of wetting agent and stirring evenly to obtain a hydrotalcite coating s...
Embodiment 2
[0033] (1) Preparation of MOF coating slurry
[0034] Dissolve 0.88g of copper nitrate trihydrate and 0.4g of isophthalic acid in 150mL of ethanol respectively, mix the two after complete dissolution, stir at room temperature for 30-120min or ultrasonically for 20-50min to obtain a precursor dispersion. The resulting dispersion was washed with ethanol and dried in a vacuum oven at 160 °C for 12 h to obtain the MOF product.
[0035] Add MOF and PVDF to NMP at a mass ratio of 1.5:1, stir and disperse for 60 minutes to obtain a coating slurry.
[0036] (2) Preparation of hydrotalcite coating slurry
[0037] First, mix 60 parts of ultrapure water and 0.5 parts of dispersant evenly according to the mass ratio, then add 30 parts of magnesium aluminum hydrotalcite, and then add 6 parts of thickener after high-speed stirring and mix evenly; Grinding with a sand mill, finally adding 3 parts of binder and 0.1 part of wetting agent and stirring evenly to obtain a hydrotalcite coating s...
Embodiment 3
[0041] (1) Preparation of MOF coating slurry
[0042] Dissolve 0.88g of copper nitrate trihydrate and 0.4g of isophthalic acid in 150mL of ethanol respectively, mix the two after complete dissolution, stir at room temperature for 30-120min or ultrasonically for 20-50min to obtain a precursor dispersion. The resulting dispersion was washed with ethanol and dried in a vacuum oven at 160 °C for 12 h to obtain the MOF product.
[0043] Add MOF and PVDF into NMP at a mass ratio of 3:1, stir and disperse for 60 minutes to obtain a coating slurry.
[0044] (2) Preparation of hydrotalcite coating slurry
[0045] First, mix 60 parts of ultrapure water and 0.5 parts of dispersant evenly according to the mass ratio, then add 40 parts of magnesium aluminum hydrotalcite, and then add 6 parts of thickener after high-speed stirring and mix evenly; Grinding with a sand mill, finally adding 3 parts of binder and 0.1 part of wetting agent and stirring evenly to obtain a hydrotalcite coating s...
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