Lithium ion power battery and preparation method thereof
A power battery and lithium-ion technology, which is applied in the field of lithium-ion power batteries and their preparation, can solve the problems of poor battery performance, poor electrical conductivity, and large specific surface area, and achieve no environmental pollution, long cycle life, and high energy density. Effect
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[0034] A method for preparing a lithium ion power battery includes the following steps:
[0035] 1) Take the first active material, the first adhesive, the first conductive agent, the second active material, the second adhesive and the second conductive agent respectively in the formula amount, and bake them in an environment of 115-125℃ 11-13h, spare;
[0036] 2) Preparation of the positive electrode slurry: take the first active material, the first adhesive and the first conductive agent that have been baked in step 1), and mix to obtain the first mixed powder; take N-methylpyrrolidone or remove Ionized water is used as the first solvent, and the first mixed powder and the first solvent are mixed, and after stirring uniformly, a positive electrode slurry is obtained;
[0037] 3) Preparation of a positive electrode sheet: take the positive electrode slurry, uniformly coat it on the positive electrode current collector, dry, then place it on a roller press for rolling, and finally s...
Example Embodiment
[0042] Example 1
[0043] A lithium ion power battery includes a positive electrode sheet and a negative electrode sheet; the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer arranged on the surface of the positive electrode current collector; the negative electrode sheet includes a negative electrode current collector and is arranged on the The negative active material layer on the surface of the negative current collector. The formulations of the positive active material layer and the negative active material layer are shown in Table 1. The lithium ion power battery is prepared according to the following steps:
[0044] 1) Take the first active material, the first adhesive, the first conductive agent, the second active material, the second adhesive and the second conductive agent respectively in the formula amount, and bake them at 120°C for 12h, spare;
[0045] 2) Preparation of positive electrode slurry: ta...
Example Embodiment
[0051] Example 2
[0052] The difference between Example 2 and Example 1 lies in that the formulas of the positive active material layer and the negative active material layer are different, see Table 1 for details;
[0053] The preparation steps are different, including the following differences:
[0054] In step 1), the baking temperature is 125°C, and the baking time is 11h;
[0055] In step 2), the first solvent is deionized water, and the weight of the first solvent is 30% of the weight of the first mixed powder;
[0056] In step 3), the thickness of the positive electrode current collector is 13um, and the density of the positive electrode slurry on the positive electrode current collector is 2g / 100cm 2 ;
[0057] In step 4), the first solvent is deionized water, and the weight of the second solvent is 30% of the weight of the second mixed powder;
[0058] In step 5), the thickness of the negative electrode current collector is 12um, and the density of the negative electrode slurry...
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