Preparation method of lithium nickel cobalt manganese oxide laminated soft-packed battery and battery
A technology of nickel-cobalt lithium manganese oxide and soft-pack batteries, which is applied to battery electrodes, secondary battery charging/discharging, secondary batteries, etc., can solve the problems that the cycle life of fast charging cannot be guaranteed, and the safety performance of batteries cannot be guaranteed. To achieve the effect of convenient batch automatic production, reduce polarization, and reduce polarization
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Embodiment 1
[0037] In this embodiment, a lithium-ion battery with high energy density, good cycle performance and fast charging speed is prepared.
[0038] Positive electrode production:
[0039] The positive electrode sheet is composed of the following materials in mass percentage: 97.3% of positive electrode active material, 1.3% of binder, and 1.4% of conductive agent. Among them, the positive electrode active material is single crystal LiNi 0.5 co 0.2 mn 0.3 o 2, its D 50 is 4.5 μm; the binder is polyvinylidene fluoride, and the conductive agent is a mixture of conductive carbon black and carbon nanotubes at a mass ratio of 5:8. After mixing the above ingredients, add the solvent N-methylpyrrolidone to make a slurry, and evenly coat it on the positive electrode current collector. The coating surface density is 24mg / cm2, and the compacted density is 3.2g / cm2 3 .
[0040] Negative electrode sheet production:
[0041] The negative electrode active material is equipped according t...
Embodiment 2
[0082] The same method as in Example 1 is used to make the positive electrode sheet, except that the positive active material used is LiNi 0.8 co 0.1 mn 0.1 o 2 .
[0083] The same method as in Example 1 was used to make the negative electrode sheet, assemble the battery, inject electrolyte, seal, and then leave it at a temperature of 38° C. to 42° C. for 38 hours to form a battery.
[0084] Roll the battery. The thickness of the battery before rolling is 5.3mm. When rolling, the distance between the roll gaps is 5.1mm, the temperature is 25±3°C, and the rolling time is 10 seconds.
[0085] Precharge the battery at 0.01C ~ 0.1C, the process is as follows: first charge with 0.015C for 90 minutes, then charge with 0.05C for 150 minutes, and finally charge with 0.1C for 150 minutes, the charged power is 40% of the rated capacity; pump air;
[0086] Then the battery was left to stand at a temperature of 38° C. to 42° C. for 38 hours.
[0087] The battery is rolled, the distan...
Embodiment 3
[0096] Positive electrode production:
[0097] The same method as in Example 1 was used to make the positive electrode sheet.
[0098] Negative electrode sheet production:
[0099] The negative electrode active material is equipped according to the theoretical capacity ratio of negative electrode and positive electrode of 137:100. Wherein the negative electrode active material is soft carbon coated with artificial graphite, the thickener is sodium carboxymethyl cellulose, and the negative electrode binder is styrene-butadiene latex. Negative electrode sheet production includes the following steps:
[0100] A, make the first kind of slurry and the second kind of slurry respectively; Wherein, the conductive agent in the first kind of slurry is vapor phase growth carbon fiber and conductive carbon black super p that mass ratio is 2:1, described Vapor-grown carbon fiber and conductive carbon black super p accounted for 2.5% of the first slurry, negative electrode active materia...
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