Fabrication method of positive electrode for secondary battery and secondary battery including same
A technology for secondary batteries and manufacturing methods, which is applied in secondary battery manufacturing, electrode manufacturing, battery electrodes, etc., and can solve the problems of reduced substrate adhesion, reduced fluidity of electrode slurry, and reduced workability
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Embodiment 1
[0099] Step 1: Preparation of positive electrode slurry
[0100] 79.5% by weight of nickel cobalt manganese oxide (NCM) (specifically, CSG131, Ni:Co:Mn=8:1:1), 1.2% by weight of polyvinylidene fluoride, 0.8% by weight of carbon black and 18.5 % by weight of N-methylpyrrolidone (NMP) was mixed with each other to prepare positive electrode slurry (81.5% by weight solid based on total slurry), and the prepared positive electrode slurry was heated to 80°C in a stirring tank (stirring tank) Stir for 30 minutes to keep the temperature of the positive electrode slurry at 80 °C.
[0101] Step 2: Fabrication of the positive electrode
[0102] The cathode slurry prepared in step 1 (in a state heated to 80° C.) was coated on an aluminum current collector (aluminum foil with a thickness of 12 μm) using a slot die coater.
[0103]Then, the applied positive electrode slurry was left at 25° C. for 5 seconds, cooled to 50° C., and dried in a drying furnace heated with hot air at 140° C....
Embodiment 2 to Embodiment 4 and comparative example 3
[0127] Manufacture the positive pole in the same manner as in Example 1, the difference is that in step 1 of Example 1, as shown in Table 2, by changing the solid content in the positive pole slurry and the heating of the positive pole slurry when preparing the positive pole slurry temperature to change the viscosity of the positive electrode slurry. In this case, the heating temperature of Examples 2 to 4 was adjusted so that the viscosity of each slurry was 7800 cP to 8700 cP, and in Comparative Example 3, a slurry at room temperature (25° C.) without heating was used. slurry.
[0128] (Evaluation method)
[0129] The evaluation of the interfacial adhesive force between the active material layer and the current collector and the evaluation of the viscosity were carried out in the same manner as in Evaluation Example 1, and the evaluation results are shown in Table 2.
[0130] [Table 2]
[0131]
[0132] Referring to Table 2, it can be seen that in the case of Examples ...
Embodiment 5 to Embodiment 8
[0137] A positive electrode was fabricated in the same manner as in Example 1 except that the drying process of the coated positive electrode slurry in Step 2 of Example 1 was changed as described in Table 3.
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