Paste composition for negative electrode for lithium-ion rechargeable battery, composite particles for negative electrode for lithium-ion rechargeable battery, slurry composition for negative electrode for lithium-ion rechargeable battery, negative electrode for lithium-ion rechargeable battery, and lithium-ion rechargeable battery
A secondary battery and lithium ion technology, applied in secondary batteries, battery electrodes, lithium batteries, etc., can solve the problem of uneven distribution of silicon-based negative electrode active materials
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preparation example Construction
[0116] In the monomer composition used in the preparation of the water-soluble polymer, it may contain the above-mentioned ethylenically unsaturated carboxylic acid compound (A), compound (B), polyfunctional compound (C) and compound (D) copolymerizable known compounds. In addition, the proportion of monomers contained in the water-soluble polymer used in the preparation of the water-soluble polymer is preferably 20% by mass or less, more preferably 10% by mass, other than these (A) to (D). Below, it is more preferably less than 0.1% by mass.
[0117] More specifically, examples of other compounds include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, tert-butyl acrylate, pentyl acrylate, hexyl acrylate, heptyl acrylate, acrylate, octyl acrylate, nonyl acrylate, decyl acrylate, lauryl acrylate, n-tetradecyl acrylate, octadecyl acrylate, perfluoroalkylethyl acrylate, phenyl acrylate and other acrylates ;Methyl methacrylate, ethyl met...
Embodiment
[0224] Hereinafter, the present invention will be specifically described based on examples, but the present invention is not limited to these examples. In addition, in the following description, unless otherwise specified, "%" and "part" which show an amount are based on mass.
[0225] In Examples and Comparative Examples, the electrolyte swelling degree of the water-soluble polymer, the glass transition temperature and gel content of the granular polymer, the productivity of the negative electrode, the adhesion of the negative electrode composite material layer and the current collector, and The rate characteristics, cycle characteristics, and storage stability of the lithium ion secondary battery were evaluated by the following methods, respectively.
[0226]
[0227] The aqueous solution containing the water-soluble polymer was dried in an environment with a humidity of 50% and a temperature of 23 to 25° C. to form a film with a thickness of 1±0.3 mm. The formed film was...
manufacture example 1
[0272] 720 g of ion-exchanged water was poured into a 1 L flask having a diaphragm, heated at a temperature of 40° C., and the inside of the flask was replaced with nitrogen at a flow rate of 100 mL / min. Next, 10 g of ion-exchanged water, 9.5 g of acrylic acid (25.0%) as the ethylenically unsaturated carboxylic acid compound (A), and 28.5 g of acrylamide (75.0%) as the compound (B) were mixed and injected with a syringe. into the flask. Thereafter, 8.0 g of a 2.5% aqueous solution of potassium persulfate as a polymerization initiator was added to the flask with a syringe. Furthermore, 15 minutes later, 40 g of a 2.0% aqueous solution of tetramethylethylenediamine as a polymerization accelerator was added with a syringe. After 4 hours, a 2.5% aqueous solution of 4.0 g of potassium persulfate as a polymerization initiator was added to the flask, and a 2.0% aqueous solution of 20 g of tetramethylethylenediamine as a polymerization accelerator was added, and the temperature was r...
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