Preparation method of water-based adhesive for lithium batteries
A water-based adhesive, lithium battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of few types of water-based adhesives, long dispersion period, low dispersion efficiency, etc., to achieve easy operation, low price, Good bonding performance
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Embodiment 1
[0019] In this example, 300g of a commercially available 50% SBS (styrene and butadiene block copolymer) emulsion was placed in a reaction kettle, stirred at 300 rpm, and heated to 50°C at 3°C / min, and then 9g of formazan Acrylic acid and 36g of octyl acrylate were added to the reaction kettle, stirred evenly, then 3g of ammonium persulfate was added, under nitrogen protection, the temperature was raised to 75°C at 2°C / min, and reacted at constant temperature for 1 hour; then 300g of SBS emulsion, 9g Methacrylic acid monomer and 36g of octyl acrylate monomer, nitrogen protection, 75 ℃ constant temperature, within two hours; then 2 ℃ / minute to 80 ℃, constant temperature for 3 hours, then add 200g of distilled water, 80 ℃ constant temperature for 30 minutes After that, it is made into a water-based adhesive.
[0020] After testing, the water-based adhesive has a solid content of 42.8% and a viscosity of 500 centipoise (25°C), which has a good dispersion effect and has high dis...
Embodiment 2
[0022] In this embodiment, the emulsion is the same as in Example 1, except that on the basis of the water-soluble acrylic monomer and the oil-soluble acrylic monomer in Example 1, the hydrophilic acrylamide is increased, and the consumption of octyl acrylate is reduced. The mass ratio of sodium bisulfate is 1:1, the initiator is sodium persulfate, and the amount of the initiator is 1.5%.
[0023] This example is achieved through the following preparation method: 300g of SBS emulsion is placed in a reaction kettle, stirred at 300 rpm, heated to 50°C at 3°C / min, and then 9g of methacrylic acid, 3.6g of acrylamide and 32.4g of octylacrylate Put the ester into the reaction kettle, stir evenly, then add 2.0g sodium persulfate, 2.0g sodium bisulfite, nitrogen protection, heat up to 70°C at 2°C / min, and react at constant temperature for 1 hour; then add 300g SBS emulsion twice , 9g methacrylic acid monomer, 3.6g acrylamide, 32.4g octyl acrylate monomer, 1g azobisisobutyronitrile, ni...
Embodiment 3
[0026] Taking natural graphite as the negative electrode material, using the water-based binder synthesized in the above-mentioned embodiment 1 or embodiment 2, by mass percentage 96% of natural graphite, 1% of S-P conductive agent and 3% of the binder formula, made The negative electrode plate is used as the negative electrode, and the positive electrode is matched to make a lithium-ion battery for charging and discharging.
[0027] Tests have proved that the lithium battery water-based adhesive prepared by the present invention has a battery capacity retention rate of over 90% after 100 cycle cycles, indicating that the cycle performance is excellent.
PUM

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