A preparation method of a high-capacity silicon powder doped lithium battery anode slurry, which improves the capacity of the material by adding silicon nanopowder in the preparation process of the conventional anode slurry, and can meet the requirement of high energy density of the lithium ion battery And through the steps of thickener solution preparation, dispersing powder, high viscosity stirring, low viscosity stirring, viscosity test, vacuum defoaming, etc., so that the components, especially the nano silicon powder, are sufficiently dispersed in the negative electrode system, avoiding nano silicon The agglomeration of the powder ensures the stability of the cycle; the invention has the advantages of short preparation time, small equipment wear, low production energy consumption, good dispersion effect and the like. The lithium battery prepared by using the negative electrode slurry provided by the invention has low internal resistance, a significant increase in volume energy density, and good cycle performance of the battery.
The invention discloses a preparation method of a large-capacity silicon powder doped lithium battery anode slurry, and adopts the following technical schemes: (1) preparation of a thickener solution: adding a thickener carboxymethylcellulose sodium according to a certain ratio ( CMC) dissolved in deionized water solvent, dissolved evenly with a stirrer, taken out and placed for 60-100 minutes; (2) Dispersed powder: the negative electrode active material, nano-silica powder and conductive agent are added to the mixing tank in proportion, stirring Disperse 30 times. ~40 minutes, at the end of the time 1/2, finally, scrape the paddle and powder onto the barrel; (3) high viscosity stirring: add 55%~60% of the total thickener solution to the above stirred powder The mixture is stirred and dispersed for 60 to 70 minutes, and at 1/3, 2/3 and finally, the slurry is scraped onto the paddle and the barrel, and the slurry temperature is controlled between 25 and 35 °C. (4) Low-viscosity stirring: 35-30% of the total amount of the thickener solution is added to the above high-viscosity stirring slurry, stirred and dispersed for 60-70 minutes, and at 1/3 time, 2 / 3, finally, Scrape off the slurry on the paddle and barrel, and control the temperature of the slurry between 25-35 ° C; (5) Degree test: stir the viscosity of the low-viscosity slurry in the above steps, test the viscosity, as in 2000 Within the normal range of -5000 Mpa·S, go directly to the next step; if it exceeds the above range, add the total amount of the thickener solution to 5% to 10%, stir and disperse for 30-40 minutes, and at 1/2 At the moment and finally, the slurry and the barrel on the blade are scraped off, and then the viscosity of the slurry is checked to reach the viscosity range. (6) Adding adhesive: adding binder SBR, stirring and dispersing for 10 to 30 minutes; (7) Vacuum defoaming: under low speed stirring, vacuuming barrel, vacuum degree is 0.09~0.1MPa, time is 15-30 Minutes, i.e., the negative electrode slurry prepared by the method of the present invention was obtained.
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