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

Active Publication Date: 2015-03-25
BLUE OCEAN & BLACK STONE TECH CO LTD FUJIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the above-mentioned prior art, the purpose of the present invention is to solve the technical problems of existing lithium battery water-based adhesives such as few types, high dos

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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.

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Abstract

The invention provides a preparation method of a water-based adhesive for lithium batteries. The preparation method comprises the following steps: dripping water soluble acrylic monomers, oil soluble acrylic monomers and an initiator into a styrene-butadiene-styrene block copolymer (SBS) emulsion, and carrying out a stirring and heating reaction to obtain the water-based adhesive for lithium batteries; the weight ratio of the water soluble acrylic monomers to the oil soluble acrylic monomers to the initiator to the styrene-butadiene-styrene block copolymer (SBS) emulsion is (2.5-15) : (10-25) : (0.5-10) : 100. By adopting the invention, the technical problems of the existing water-based adhesive for lithium batteries of few varieties, high dosage, low dispersion efficiency and longer dispersion period are solved, the water-based adhesive prepared by the method disclosed by the invention has better bonding performance and dispersion effect, has high dispersion efficiency on such electrode materials as graphite, and has the advantages of low dosage and excellent cycle performance.

Description

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Claims

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Application Information

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Owner BLUE OCEAN & BLACK STONE TECH CO LTD FUJIAN
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