Preparation method for cathode paste of high-capacity lithium ion battery
A lithium-ion battery, cathode slurry technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of difficult dispersion of mixed conductive agents, achieve low internal resistance, ensure consistency, and reduce agglomeration effects
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Embodiment 1
[0028] The preparation method of the positive electrode slurry of the large-capacity lithium-ion battery in this embodiment, each component is based on lithium iron phosphate: polyvinylidene fluoride: Super-p: KS-6: N-methylpyrrolidone = 93:3.5:2:1.5: The mass ratio of 72.4 is weighed, and the preparation steps are as follows. The mixing equipment in the following steps is a double planetary vacuum mixer. The control method of the slurry temperature is to pass into the constant temperature circulating water on the wall of the mixing tank:
[0029] 1) Before preparing the slurry, first bake lithium iron phosphate, conductive agent Super-p and KS-6 at 115°C for 3 hours under vacuum conditions, bake polyvinylidene fluoride at 85°C for 5 hours under vacuum conditions, and then The temperature is -0.08MPa. After the baking is finished, the temperature is naturally lowered to below 40°C and set aside;
[0030] 2) Dissolve polyvinylidene fluoride in N-methylpyrrolidone equivalent to ...
Embodiment 2
[0038] The preparation method of the positive electrode slurry of the large-capacity lithium-ion battery in this embodiment, each component according to lithium iron phosphate: polyvinylidene fluoride: Super-p: KS-6: N-methylpyrrolidone = 92:4:2.5:1.5: The mass ratio of 69.5 is taken by weighing, and the preparation steps are as follows:
[0039] 1) Before preparing the slurry, first bake lithium iron phosphate, conductive agent Super-p and KS-6 at 120°C for 3.3h under vacuum conditions, and bake polyvinylidene fluoride at 81°C for 5.8h under vacuum conditions , the vacuum degree is -0.083MPa, after the baking is completed, the temperature is naturally lowered to below 40°C, and it is set aside;
[0040] 2) Dissolve polyvinylidene fluoride in N-methylpyrrolidone equivalent to 16 times its own weight, stir and disperse in the glue machine under vacuum for 1.5h, the vacuum degree is -0.083MPa, the stirring revolution speed is 22rpm, disperse The speed is 1100rpm. During the pre...
Embodiment 3
[0048] The preparation method of the positive electrode slurry of the large-capacity lithium-ion battery in this embodiment, each component is based on lithium iron phosphate: polyvinylidene fluoride: Super-p: KS-6: N-methylpyrrolidone = 94:3.5:1.5:1: The mass ratio of 78.6 is weighed, and the preparation steps are as follows. The mixing equipment in the following steps is a double planetary vacuum mixer. The control method of the slurry temperature is to pass into the constant temperature circulating water on the wall of the mixing tank:
[0049] 1) Before preparing the slurry, first bake lithium iron phosphate, conductive agent Super-p and KS-6 at 110°C for 3.7h under vacuum conditions, and bake polyvinylidene fluoride at 78°C for 6.3h under vacuum conditions , the vacuum degree is -0.087MPa, after the baking is completed, the temperature is naturally lowered to below 40°C, and it is set aside;
[0050] 2) Dissolve polyvinylidene fluoride in N-methylpyrrolidone equivalent to...
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