Manufacturing method of cathode pole piece of lithium ion battery
A technology of lithium ion battery and negative pole piece, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of battery deformation, pole piece deformation, film release, etc., to improve cycle rebound, improve thickness expansion, and improve adhesion. sexual effect
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Embodiment 1
[0027] Example 1 , the preparation of conductive agent slurry, concrete parameter is that slurry solid content is 20%, the ratio of CMC is 1%, and polyacrylate is 10%, and conductive agent is 60%, and SBR is 29%, and the viscosity of final slurry is 260mpa.s. The above-mentioned conductive agent slurry was treated on the current collector by transfer coating to obtain a conductive agent coating with a weight of 2mg (1540.25mm2) and a thickness of 1.5um, and then baked at 80°C for 5h. When the slurry transfer coating of artificial graphite is applied on the above-mentioned current collector, the magnetization treatment is carried out, and the magnetization intensity is 6000 GS. Finally assembled into a lithium-ion battery. Moreover, the photo-coating of the conductive agent coating is evenly distributed. The adhesive force of this negative electrode sheet is as follows figure 1 , it can be seen from the figure that the adhesive force of the negative electrode sheet has inc...
Embodiment 2
[0028] Example 2 , the preparation of conductive carbon fiber slurry, the specific parameters are that the solid content of slurry is 10%, the ratio of CMC is 5%, polyacrylate is 15%, conductive carbon fiber is 50%, SBR is 30%, and the viscosity of final slurry is 100mpa.s. The above-mentioned conductive carbon fiber slurry was processed on the current collector by extrusion coating to obtain a conductive carbon fiber coating with a weight of 1mg (1540.25mm2) and a thickness of 0.5um, and then baked at 50°C for 5h. When the slurry of natural graphite is extrusion-coated on the above-mentioned current collector, magnetization treatment is performed, and the magnetization intensity is 8000 GS. Finally assembled into a lithium-ion battery. The cyclic expansion data of the cell composed of this negative pole piece is as follows: figure 2 , it can be seen from the figure that the battery core composed of conductive carbon fiber coating and magnetized negative pole piece has a ...
Embodiment 3
[0029] Example 3, the preparation of buckyball C60 slurry, the specific parameters are that the solid content of the slurry is 30%, the ratio of CMC is 10%, polyacrylate is 25%, buckyball C60 is 55%, SBR is 10%, and the final slurry The viscosity of the material is 500mpa.s. The above buckyball C60 slurry was processed on the current collector by gravure printing to obtain a buckyball C60 coating with a weight of 5mg (1540.25mm2) and a thickness of 5um, and then baked at 70°C for 5h. When the slurry of mixed graphite (artificial graphite: natural graphite = 1:2) is extruded and coated on the above-mentioned current collector, magnetization treatment is performed, and the magnetization strength is 7000 GS. Finally assembled into a lithium-ion battery. After 100 cycles of the battery cell, after the negative electrode diaphragm is fully charged, there is no defilming of the negative pole piece, and it has a good appearance of the diaphragm; while the pole piece that has not b...
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Abstract
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