Process for preventing lithium ion battery pole piece from powder shedding during processing
A lithium-ion battery and processing technology, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve problems such as increased power consumption, powder removal, and increased production costs, to improve wetting effect, enhance liquid absorption capacity, increase The effect of adhesion
Pending Publication Date: 2019-10-08
YINLONG ENERGY CO LTD
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- Abstract
- Description
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- Application Information
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Problems solved by technology
For example, installing automatic roller wiping equipment on the roller press, this method can clean the powder on the roller in time, but it cannot ensure that the pole piece does not drop powder
Or use the hot rolling process, which solves the problem of powder falling in the rolling stage to a certain extent, but increases the production cost, and cannot guarantee that the pole piece will not lose powder in the subsequent section
Or install a ventilation and powder removal device. This method has a general powder removal effect and increases additional power consumption.
None of the above methods can completely solve the problem of powder falling off the battery pole piece.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0033] Dissolve PVDF in NMP to make PVDF glue with a solid content of 6.0%, and coat it on the unrolled graphite negative electrode sheet. The thickness of the PVDF glue layer is 1-3 μm. The coating method is as follows: figure 1 , figure 2 , Both sides of the current collector 1 are the pole piece coating 2, and the outer surface of the pole piece coating 2 is coated with a protective layer 3, and the protective layer 3 is an adhesive layer or a ceramic coating.
Embodiment 2
[0035] Dissolve PVDF in NMP to make PVDF glue, then add ceramic powder to make ceramic slurry, wherein the mass ratio of PVDF to ceramic is 3:1, and the solid content of the slurry is 20%. On the roll-pressed positive electrode sheet, the thickness of the PVDF+ceramic coating is 5-8 μm, and the coating method is as follows: figure 1 , figure 2 .
Embodiment 3
[0037] Dissolve CMC in deionized water to make CMC glue with a solid content of 1.5%, and coat it on the non-rolled silicon carbon negative electrode sheet. The thickness of the CMC glue layer is 10-12 μm. The coating method is as follows: figure 1 , figure 2 .
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Abstract
The invention discloses a process for preventing a lithium ion battery pole piece from powder shedding during processing. The process is characterized in that a layer of glue or ceramic coating is applied on a surface of the lithium ion battery pole piece, the glue layer or the ceramic coating completely covers a coating area of the lithium ion battery pole piece, wherein the glue layer is formedby dissolving CMC in the deionized water or dissolving PVDF in NMP to prepare glue solution coated on the coating of the lithium ion battery pole piece and drying the coated lithium ion battery pole piece, and the ceramic coating is prepared by mixing and stirring the ceramic powder and the PVDF glue solution, coating the mixture on the coating of the lithium ion battery pole piece and drying thecoated lithium ion battery pole piece. The process is advantaged in that the powder material can be prevented from shedding from the pole piece, adhesion between the pole piece and a diaphragm is improved, hot pressing and shaping capability of the battery is further improved, moreover, the liquid absorption capability of the pole piece is improved, and thereby the wetting effect of the electrolyte for the pole piece is improved.
Description
technical field [0001] The invention relates to the field of lithium-ion battery preparation technology, in particular to a treatment technology for preventing lithium-ion battery pole pieces from falling off during processing. Background technique [0002] In the production process of lithium-ion batteries, it is common to encounter the problem of powder dropping of battery pole pieces during rolling, die-cutting, slitting, lamination or winding processes. In response to this problem, the industry has several ways to deal with it. For example, installing automatic roller wiping equipment on the roller press, this method can clean the powder on the roller in time, but it cannot ensure that the pole piece does not drop powder. Or use hot rolling process, this method solves the problem of powder falling in the rolling stage to a certain extent, but increases the production cost, and cannot guarantee that the pole piece will not drop powder in the subsequent process. Or insta...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H01M4/04H01M4/139
CPCH01M4/139H01M4/0402Y02E60/10
Inventor 马美品郑照前
Owner YINLONG ENERGY CO LTD