Adhesive for battery diaphragm coating and preparation method of adhesive
A battery separator and adhesive technology, used in battery pack parts, separators/films/diaphragms/spacers, circuits, etc., can solve the problem of poor wettability of ceramic separators, easy falling off of ceramic powder, and weak adhesion. problems, to achieve the effect of improving liquid absorption/retention capacity, inhibiting shedding, and high ionic conductivity
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Embodiment 1
[0021] Add sodium persulfate and sodium lauryl sulfate to 150ml deionized water in a weight ratio of 0.04:3, then add a 5% aqueous solution of sodium hydroxide to adjust the pH to 8; then add hexahedral vinyl-POSS, wherein, The weight ratio of hexahedral vinyl-POSS to sodium persulfate is 0.02:0.04; under proper stirring, add acrylic acid with a weight ratio of 250:1 to vinyl-POSS; , cooled to 40°C, demulsified with concentrated hydrochloric acid, filtered, washed, and dried to obtain a white powder hexahedral vinyl-POSS / polyacrylic acid core-shell polymer adhesive.
[0022] Add adhesive powder, aluminum oxide nanoparticles, and carboxymethyl cellulose to the aqueous solution at a weight ratio of 5:1:90 to make a mixed solution with a solid content of 50%, and mix it at 20,000 rpm for 1 hour. A slurry for coating was obtained. Apply the slurry to the surface of the polypropylene separator by scraping, and dry at 80°C to obtain a 5 μm thick lithium battery ceramic separator co...
Embodiment 2
[0024] Add azobisisobutyronitrile and sodium dodecylbenzenesulfonate to 120ml deionized water at a weight ratio of 0.02:3, then add 5% sodium hydroxide aqueous solution to adjust the pH to 8; then add pentahedral ethylene Base-POSS, wherein the weight ratio of pentahedral vinyl-POSS and azobisisobutyronitrile is 0.03:0.05; under proper stirring, add acrylonitrile with vinyl-POSS weight ratio of 300:1; then at 70 Reaction at constant temperature at ℃ for 6 hours. After the reaction is completed, cool down to 35℃, demulsify with concentrated hydrochloric acid, filter, wash, and dry to obtain a white powdery pentahedral vinyl-POSS / polyacrylonitrile core-shell polymer adhesive .
[0025] Add adhesive powder, aluminum oxide nanoparticles, and hydroxypropyl methylcellulose to the aqueous solution at a weight ratio of 5:2:90 to make a mixed solution with a solid content of 45%, and mix at 15,000 rpm 1h, the slurry for coating is obtained. Apply the slurry to the surface of the poly...
Embodiment 3
[0027] Ammonium persulfate and sodium stearate were added to 130ml of deionized water at a weight ratio of 0.03:2.5, and then 5% sodium hydroxide aqueous solution was added to adjust the pH to 7.5; then octahedral vinyl-POSS was added, wherein, octahedral The weight ratio of surface vinyl-POSS to ammonium persulfate is 0.03:0.08; under proper stirring, add acrylic acid with a weight ratio of 300:1 to vinyl POSS; react at a constant temperature of 80°C for 5 hours, after the reaction is completed, cool down to 30°C, demulsify with concentrated hydrochloric acid, filter, wash, and dry to obtain a white powdery octahedral vinyl-POSS / polyacrylic acid core-shell polymer adhesive.
[0028] Adhesive powder, titanium dioxide nanoparticles, and hydroxypropyl methylcellulose were added to the aqueous solution in a weight ratio of 6:2:90 to prepare a mixed solution with a solid content of 45%, and mixed for 2 hours at 20,000 rpm to obtain Slurry for coating. Apply the slurry to the surf...
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