Lithium ion battery silicon-carbon negative electrode binder, and negative electrode sheet and preparation method thereof
A lithium-ion battery and negative pole piece technology, which is applied in the direction of electrode manufacturing, battery electrodes, negative electrodes, etc., can solve the problems of decreased adhesion of coating layers, uneven distribution of binders, high production costs, etc., to achieve inhibition of migration, The effect of reducing production cost and improving battery performance
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Embodiment 1
[0039] (1) According to the following ratio, use a conventional double planetary homogenizer to homogenize polyallylamine hydrochloride (PAH) and polyacrylic acid-polybenzimidazole (PAA-PBI) at a high speed according to the molar ratio of 20:80 Make glue in the slurry machine, add conductive additives, silicon carbon active materials and water in sequence to obtain the negative electrode slurry; based on the total mass of the negative electrode slurry, the negative electrode slurry is composed of the following components in mass percentage: negative electrode binder (polyallylamine hydrochloride (PAH) and polyacrylic acid-polybenzimidazole (PAA-PBI)) 1.5%, silicon carbon active material (5wt% average particle diameter is the nano silicon of 100nm and 95wt% artificial Graphite) 95%, carbon nanotube 0.5%, water surplus; The viscosity of negative electrode slurry is controlled at 3000mpa.s; Solid content is controlled at 50wt%;
[0040] (2) if figure 2 As shown, the negative el...
Embodiment 2
[0045] (1) According to the following ratio, use a conventional double planetary homogenizer, glue polyallylamine hydrochloride (PAH) in a high-speed homogenizer, and add conductive additives, silicon carbon active materials and water in sequence , get the negative electrode slurry; take the negative electrode slurry gross mass as a benchmark, the negative electrode slurry is made up of the following mass percentage components: polyallylamine hydrochloride (PAH) 5%, silicon carbon active material (average of 20wt%) Particle size is 300nm nano-silicon and 80wt% artificial graphite) 80%, Ketjen black 0.5%, carbon black 1.5%, water surplus; The viscosity of negative electrode slurry is controlled at 7500mpa.s; Solid content is controlled at 38wt%;
[0046] (2) if figure 2 As shown, the negative electrode slurry is evenly coated on the upper base material layer, and the coating amount is controlled at 250g / m 2 The thickness of the base material layer is 5 μm; the three-stage dry...
Embodiment 3
[0051] (1) According to the following proportions, using a conventional double planetary homogenizer, polyacrylic acid-polybenzimidazole (PAA-PBI) is glued in a high-speed homogenizer, and conductive additives, silicon carbon active materials and Water, get negative electrode slurry; Taking negative electrode slurry gross mass as benchmark, described negative electrode slurry is made up of the component of following mass percent: polyacrylic acid-polybenzimidazole (PAA-PBI) 5%, silicon carbon active material ( 15% average particle diameter is 20nm nano-silicon and 85wt% artificial graphite) 95%, carbon black 3.5%, solvent balance; The viscosity of negative electrode slurry is controlled at 2100mpa.s; Solid content is controlled at 62wt%;
[0052] (2) if figure 2 As shown, the negative electrode slurry is evenly coated on the upper base material layer, and the coating amount is controlled at 80g / m 2 The thickness of the base material layer is 15 μm; the three-stage drying is ...
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