Binder and preparation method thereof, silicon negative electrode material and secondary battery
A binder, silicon anode technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as volume change and shedding, and achieve the effects of improving transmission, preventing cracking and shedding, and high tensile strength
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[0039] The adhesive obtained by using the preparation method provided by the present invention has all the advantages of the above-mentioned adhesive, and will not be repeated here.
[0040] In the preparation method provided by the invention, the mechanism of action of atom transfer radical polymerization is as follows:
[0041]
[0042] Initiator A-X and Transition Metal Catalyst Containing Bromine Element X Oxidation-reduction reactions occur to generate higher valence And after the active species A required for initiating polymerization, the reaction enters the polymerization stage, as follows:
[0043]
[0044] The active species A and the monomer Y undergo an addition reaction, wherein the monomer Y is a pyrenyl-substituted acrylate monomer and an acrylic monomer, and after the intermediate product A-Yn is formed, the reaction enters a dormant stage, as shown in the following formula:
[0045]
[0046] The intermediate product A-Yn will be rapidly combined w...
Embodiment 1
[0069] This embodiment is a kind of adhesive, obtained by the following preparation method: 5g of (1-pyrenyl) methyl methacrylate and 0.5g of acrylic acid are added in 20ml of tetrahydrofuran and mixed uniformly, and 0.024g of 2-bromoisobutyl Ethyl acetate was added to the above solution, the oxygen in the system was removed by nitrogen gas, and then under the protection of an inert gas atmosphere, 0.5 mL of copper bromide and tris (2-dipicolylmethyl) amine tetrahydrofuran solution (both concentrations were 1.0 and 3.0 mg / L), and finally 0.4 mg of ascorbic acid was added dropwise, reacted in an oil bath at 60°C for 24 hours, the obtained polymer was dropped into ether to precipitate, and the precipitate was separated to obtain the final product.
[0070] Wherein, the chemical structural formula of (1-pyrenyl) methyl methacrylate is as follows:
[0071]
Embodiment 2
[0073] The present embodiment is a kind of adhesive, and compared with embodiment 1, the difference is that (1-pyrenyl) methyl ethacrylate is adopted in the present embodiment, and in addition, ethacrylic acid (1 -Pyrenyl) methyl ester and the molar ratio of other raw materials and the preparation process steps are all the same as in Example 1.
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