High-capacity anode bonding system, anode and lithium ion battery
A lithium-ion battery, high-capacity technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of easy cracking of active materials, and achieve the effect of improving long cycle life, improving life, and increasing life.
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[0039] The present invention also provides a method for preparing the lithium ion battery negative electrode as described above, which includes:
[0040] S100, dispersing the negative electrode active material and the polymer elastic material into the first solvent to obtain a dispersion;
[0041] S200, spray drying the dispersion to obtain a negative active composite material;
[0042] S300. After mixing the negative electrode active composite material, water-soluble polymer, conductive agent, and second solvent, coat it on the current collector, and dry it to obtain the negative electrode of the lithium ion battery.
[0043] In one embodiment of the present invention, a certain amount of the above-mentioned auxiliary additives can be added in the S100 to form an elastic wrapping layer covering the surface of the active material; and / or a certain amount can be added in the S200 The aforementioned auxiliary additives, as a crosslinking agent for the negative active layer.
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Embodiment 1
[0082] Preparation of negative electrode:
[0083] First, put 1 kg of silicon active material into 4 kg of butyl acetate and stir, add a certain amount of flexible polyetheramine and stir quickly to fully disperse the silicon active material, then add 0.95 equivalent of bisphenol A epoxy resin (flexible polyetheramine and the amount of bisphenol A add up to about 0.25 kg) and stir evenly. The above dispersion liquid is spray-dried, and the dried silicon-coated active material is collected for future use.
[0084] The negative electrode slurry formula is based on the weight percentage of the dry material, consisting of 1.5% sodium carboxymethylcellulose, 3.5% polyacrylic acid, 0.2% toluene diisocyanate, 1.5% conductive carbon black, 0.5% carbon nanotubes, 92.8% coated silicon active material composition. During the preparation of the slurry, the solvent is water, and water accounts for 60% of the total slurry.
[0085] First, add water, sodium carboxymethylcellulose and poly...
Embodiment 2
[0097] Preparation of negative electrode:
[0098] First put 1 kg of silicon active material into 4 kg of butyl acetate and stir, add a certain amount of flexible hydroxyl-terminated multifunctional polyether resin and stir quickly to fully disperse the silicon active material, then add 1.1 equivalents of toluene diisocyanate (flexible hydroxyl-terminated polyether resin) The amount of multifunctional polyether resin and toluene diisocyanate adds up to about 0.25 kilograms) and stirs evenly. The above dispersion liquid is spray-dried, and the dried silicon-coated active material is collected for future use.
[0099] The negative electrode slurry formula is based on the weight percentage of dry material, consisting of 1.5% sodium carboxymethyl cellulose, 3.5% sodium alginate, 1.5% conductive carbon black, 0.5% carbon nanotubes, and 93% coated silicon active material. During the preparation of the slurry, the solvent is water, and water accounts for 60% of the total slurry.
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