Anode aqueous binder of lithium ion battery and preparation method thereof
A technology for water-based adhesives and lithium-ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of increasing the production cost of water-based adhesives, low content of adhesive copolymers, affecting dispersion efficiency, etc. Achieve the effect of improving dispersion efficiency and film-forming properties, low surface tension and good cycle performance
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Embodiment 1
[0041] In this example, sodium vinyl sulfonate, acrylic acid and ethyl acrylate are used as reactive emulsifiers, hydrophilic acrylic monomers and lipophilic acrylic monomers respectively, and the ratio of the three in the whole preparation process is 0.5:25 :60.
[0042] Prepare the emulsion of the lithium-ion battery negative electrode water-based adhesive according to the following steps: by weight, add in the reaction kettle in turn: 1.5 parts of sodium vinyl sulfonate, 25 parts of acrylic acid, 60 parts of ethyl acrylate and water, stir and mix, and rotate at a speed of 200rpm. Nitrogen, 72 ℃ constant temperature, add 0.5 parts of 10% ammonium persulfate aqueous solution to initiate polymerization, the reaction time is 50min; then slowly dropwise add 50 parts of acrylic acid, 120 parts of ethyl acrylate aqueous solution and 10 parts of 10% (mass percentage) The ammonium persulfate aqueous solution was added dropwise for 3 hours, and the temperature in the system was 75°C...
Embodiment 2
[0045] In the present embodiment, the components and proportions added to the reaction kettle in turn are: 1.5 parts of sodium vinyl sulfonate, 12.5 parts of acrylic acid, 30 parts of ethyl acrylate and water; the components and proportions of dripping are: 62.5 parts of acrylic acid , 150 parts of ethyl acrylate; All the other steps are with embodiment 1.
[0046] The prepared water-based adhesive is an emulsion viscous liquid with a solid content of 40% and a viscosity of 1000-1500mpa.s.
Embodiment 3
[0048] In this embodiment, the water-soluble acrylic monomer and the oil-soluble acrylic monomer are respectively hydroxyethyl acrylate and butyl acrylate, and the rest of the steps are the same as in embodiment 1.
[0049] The prepared water-based adhesive is an emulsion viscous liquid with a solid content of 50% and a viscosity of 1500mpa.s.
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