Negative plate, lithium ion battery and preparation method of negative plate
A technology of lithium ion battery and negative electrode sheet, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of uneven force and low battery safety.
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preparation example Construction
[0060] In addition, the present invention also provides a preparation method of a negative electrode sheet, the preparation method comprising:
[0061] The conductive coating is coated on the current collector by gravure coating equipment, the first edge of the current collector is provided with N tabs, N is a positive integer, and the N tabs extend to the conductive coating along the first direction of the current collector outside;
[0062] The first sub-active coating is coated on the conductive coating by a zebra coating device, and the second sub-active coating is coated on the current collector, wherein the thickness of the first sub-active coating is smaller than that of the second sub-active coating the thickness of the coating; the conductive coating is located between the current collector and the first sub-active coating, and is disposed on the first edge of the current collector;
[0063] The coated current collector is dried, rolled and cut and die-cut to obtain ...
Embodiment 1
[0071]The negative active agent artificial graphite (D50=10μm), the conductive agent conductive carbon black, the adhesive styrene-butadiene rubber and carboxymethyl cellulose were mixed according to the proportions of 97.2wt%, 0.3wt%, 1.2wt% and 1.3wt%, respectively. , and then add deionized water to disperse to make an active coating with appropriate solid content. First, ketjen black and carbon nanotubes with a mass percentage of 2:1 are uniformly mixed to obtain a conductive coating. The conductive coating was first coated on the surface of the 6 μm thick copper foil current collector by gravure coating equipment (coating width 5 mm, coating thickness 5 μm); then the active coating was coated on the current collector and the current collector by zebra coating equipment. on the conductive coating; then drying, rolling and die-cutting to obtain a negative electrode sheet. The thickness of the conductive coating is 5 μm, the sum of the thicknesses of the conductive coating a...
Embodiment 2
[0073] The preparation method of Example 2 is the same as that of Example 1, and the difference lies in the particle size D50=12 μm of the selected negative electrode active agent artificial graphite.
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