Thick electrode with net-shaped current collector confinement structure, preparation method of thick electrode and lithium battery
A current collector and net-like technology, which is applied to thick electrodes with a net-like current collector confinement structure and its preparation, in the field of lithium batteries, can solve the problems of restricting the practical application of alloyed negative electrodes, the particle breakage and pulverization of negative electrode materials, and affecting the battery cycle. Stability and other issues, to achieve the effect suitable for large-scale industrial production and application, high compaction density, and solve the problem of battery performance degradation and failure
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[0033] Correspondingly, the present application also provides a method for preparing a thick electrode with a net-like current collector confinement structure, which can continue to be referred to figure 1 , the preparation method includes:
[0034] S1: Prepare alloyed negative electrode slurry.
[0035] Specifically, the active material in the alloyed negative electrode material and the conductive carbon black are ground and mixed uniformly to obtain solid particles; then an acrylic acid solution (PAA) is added to prepare the alloyed negative electrode slurry. In one embodiment, the mass ratio of the obtained slurry is, active material: conductive carbon black: acrylic acid solution=70-90:5-15:5-15, specifically 80:10:10.
[0036] S2: Filling the alloyed negative electrode slurry in the through-hole array of the mesh current collector, drying and rolling.
[0037] Specifically, the drying temperature can be controlled between 60°C and 70°C.
[0038] S3: Prepare an intercal...
Embodiment 1
[0050]Silicon (Si) active particles were mixed with conductive carbon black (Super P) and ground to obtain uniform solid particles. Add polyacrylic acid (PAA) solution to the solid particles and stir evenly to prepare Si negative electrode slurry, and the ratio of Si:Super P:PAA is 80:10:10. The Si slurry was filled into a stainless steel mesh array (500 mesh, wire diameter 0.03 mm, depth 60 μm), dried and rolled to obtain a silicon electrode with a filling depth of 60 μm. Next, a graphite slurry was prepared by the same method, and the ratio of graphite:Super P:PAA was 80:10:10. The graphite slurry was coated on one side of the filled silicon electrode with a thickness of 60 μm, and then the pole piece was dried in an oven at 60°C and then coated with graphite slurry (60 μm) on the other side, and the thickness of the slurry coating on both sides was the same; Finally, the coated thick electrodes with a net-like current collector confinement structure were transferred into a...
Embodiment 2
[0052] Silicon (Si) active particles were mixed with conductive carbon black (Super P) and ground to obtain uniform solid particles. Add polyacrylic acid (PAA) solution to the solid particles and stir evenly to prepare Si negative electrode slurry, and the ratio of Si:Super P:PAA is 80:10:10. The Si slurry was filled into a stainless steel mesh array (500 mesh, wire diameter 0.03 mm, depth 60 μm), dried and rolled to obtain a silicon electrode with a filling depth of 60 μm. Next, a graphite slurry was prepared by the same method, and the ratio of graphite:Super P:PAA was 80:10:10. The graphite slurry was coated on one side of the filled silicon electrode with a thickness of 120 μm, and then the pole piece was dried in an oven at 60 ° C and then coated with graphite slurry (120 μm) on the other side, and the slurry coating thickness on both sides was the same; Finally, the coated thick electrodes with a net-like current collector confinement structure were transferred into a v...
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