A negative electrode sheet with a special-shaped structure and a lithium-ion battery including the negative electrode sheet
A negative electrode, lithium ion technology, applied in structural parts, battery electrodes, secondary batteries, etc., can solve hidden dangers, safety problems, etc., to improve safety, solve the problem of lithium precipitation, and improve the effect of uneven lithium deposition
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[0085]
[0086] The present invention also provides a method for preparing the above-mentioned negative electrode sheet, the method comprising the following steps:
[0087] 1) respectively preparing the slurry forming the first negative electrode active material layer and the slurry forming the second negative electrode active material layer;
[0088] 2) Along the length direction of the negative electrode current collector, an empty foil area and a coated area are sequentially arranged on the surface of the negative electrode current collector, and a double-layer coating machine is used to form the slurry forming the first negative electrode active material layer and the second negative electrode active material layer. The slurry is coated on the coating area of the surface of the negative electrode current collector, and the thickness of the first negative electrode active material layer near the empty foil area gradually becomes thicker, and the thickness of the second n...
Embodiment 1
[0122] (1-1) Prepare the first negative electrode active material slurry: add the first negative electrode active material, the first conductive agent and the first binder into the stirring tank according to the mass ratio of 97.4:1.5:1.1, according to the known ingredients The process adds deionized water to make the first negative electrode active material slurry, and the solid content of the negative electrode slurry is 40% to 45%;
[0123] (1-2) Prepare the second negative electrode active material slurry: add the second negative electrode active material, the second conductive agent and the second binder into the stirring tank according to the mass ratio of 97.4:1.5:1.1, according to the known ingredients The process adds deionized water to make the second negative electrode active material slurry, and the solid content of the negative electrode slurry is 40% to 45%;
[0124] (1-3) Preparation of positive electrode active material slurry: Lithium cobaltate is used as the ...
Embodiment 2-12
[0132] The preparation of the electric core of embodiment 2-12 is the same as that of embodiment 1, the only difference is that the composition of the first negative electrode active material and the second negative electrode active material are different, the particle diameters of the first negative electrode active material and the second negative electrode active material are different, in The contents of the conductive agent in the first negative electrode active material layer and the second negative electrode active material layer are different, as shown in Table 1 for details.
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