A positive electrode sheet with a special-shaped structure and a lithium ion battery comprising the positive electrode sheet
A positive electrode, lithium ion technology, applied in positive electrodes, structural parts, battery electrodes, etc., can solve problems such as potential safety hazards, improve safety, improve uneven lithium deposition, and solve the effect of lithium deposition on the surface of negative electrodes
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[0080]
[0081] The present invention also provides a method for preparing the above-mentioned positive electrode sheet, the method comprising the following steps:
[0082] 1) respectively prepare the slurry that forms the first positive electrode active material layer and the slurry that forms the second positive electrode active material layer;
[0083] 2) along the length direction of the positive electrode current collector, set an empty foil area and a coating area on the surface of the positive electrode current collector in turn, and use a double coater to form the slurry of the first positive electrode active material layer and form the second positive electrode active material layer. The slurry is coated on the coating area on the surface of the positive electrode current collector, and the thickness of the first positive electrode active material layer near the empty foil area gradually becomes thicker, and the thickness of the second positive electrode active mater...
Embodiment 1
[0119] (1-1) Preparation of the first positive electrode active material slurry: the first positive electrode active material, the first conductive agent and the first binder are added into the stirring tank according to the mass ratio of 97.2:1.5:1.3, according to the known ingredients In the process, NMP solvent is added to prepare the first positive electrode active material slurry, and the solid content of the positive electrode slurry is 70% to 75%;
[0120] (1-2) Preparation of the second positive electrode active material slurry: add the second positive electrode active material, the second conductive agent and the second binder into the stirring tank according to the mass ratio of 97.2:1.5:1.3, according to the known ingredients In the process, NMP solvent is added to prepare the second positive electrode active material slurry, and the solid content of the positive electrode slurry is 70% to 75%;
[0121] (1-3) Preparation of negative electrode active material slurry:...
Embodiment 2-19
[0129] The preparation of the batteries of Examples 2-19 is the same as that of Example 1, except that the compositions of the first positive active material and the second positive active material are different, the particle diameters of the first positive active material and the second positive active material are different, and the first positive active material and the second positive active material are different. The content of the conductive agent in the first positive electrode active material layer and the second positive electrode active material layer is different, as shown in Table 1.
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