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A dry preparation process for pole pieces and continuous production equipment for pole pieces

A preparation process and pole piece technology, which is applied in the field of lithium battery material production, can solve the problems of aggravated powder falling and sticking to rolls, high probability of powder sticking to rolls, and easy powder falling, and achieves fast dry powder distribution, high production efficiency, small footprint effect

Active Publication Date: 2020-11-10
LINKDATA NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical defects of the above scheme are: first, the probability of powder sticking to the roller during rolling is high; second, when the above method is used in the production of double-sided pole pieces, it is necessary to set up two hot rolling treatments accordingly, otherwise in the set Problems such as powder falling are prone to occur when the fluid is sprayed on the reverse side, which is not conducive to ensuring the yield of the pole piece; third, the preferred adhesive is one or a combination of two or more of CMC, PVDF, and HFP. Does not have the immediate effect of heating and bonding, resulting in low adhesion between the current collector and the dry powder, and exacerbating the above-mentioned phenomenon of powder falling and sticking to the roller

Method used

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  • A dry preparation process for pole pieces and continuous production equipment for pole pieces
  • A dry preparation process for pole pieces and continuous production equipment for pole pieces
  • A dry preparation process for pole pieces and continuous production equipment for pole pieces

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Such as figure 1 As shown, the continuous production equipment for pole pieces in Embodiment 1 includes a current collector unwinding assembly 1 and a pole piece winding assembly 7, and also includes a first set between the current collector unwinding assembly 1 and the pole piece winding assembly 7 The powder distribution unit 2 , the first heating assembly 3 and the hot roller pressing assembly 6 , the first powder distribution unit 2 includes a first screen assembly 21 and a first slit scraping assembly 22 arranged above the feed path of the current collector.

[0065] The first heating assembly 3 is a non-contact heating assembly, and the discharge side of the first heating assembly 3 is provided with a powder suction assembly 8 for sucking dry powder outside the heating area.

[0066] The feed path of the current collector is U-shaped, and the feed path of the current collector includes two parallel and horizontal path sections. A conveying roller for guiding the c...

Embodiment 2

[0082] The dry method preparation process of embodiment 2 pole piece is as follows:

[0083] S1: Take 2400g lithium manganese oxide (80%wt) and 300gVGCF (10%wt) as the main materials, put them into a 10L beaker first, and slowly add polybutadiene toluene with a content of 40%wt dropwise while stirring the powder The solution is 750g, drop it in about 10 minutes, and heat the mixed material to 80 degrees under ventilated conditions to make the toluene volatilize naturally;

[0084] S2: Aluminum foil with a thickness of 20 μm and a width of 400 mm is used as a current collector, and the walking speed is 1 m / s. Add the dry powder obtained in step 1 to the first screen assembly 21 by manual feeding. The mesh number of the screen is 100 mesh, and the vibration frequency of the screen is 800 Hz. The slit scraping assembly 22 scrapes the dry powder layer to obtain an aluminum foil with a coating thickness of 70 μm;

[0085] S3: Heat the aluminum foil passing directly above it throu...

Embodiment 3

[0096] The dry method preparation process of embodiment 3 pole piece is as follows:

[0097] S1: With 4500g lithium iron phosphate (90%wt), 150g acetylene black (3%wt) and 100gVGCF (2%wt) as the main materials, first put them into a 15L high-speed mixer, and slowly add them dropwise under slow stirring. 833g of n-hexane solution of 30%wt ethylene propylene copolymer is dripped within about 5 minutes, and the high-speed mixer is sealed, and the high-speed mixing is about 10 minutes, and the mixed material is heated to 80 degrees under the condition of ventilation and slow stirring. Let n-hexane volatilize naturally.

[0098] S2: Aluminum foil with a thickness of 20 μm and a width of 400 mm is used as a current collector, and the walking speed is 2 m / s. Add the dry powder obtained in step 1 to the first screen assembly 21 by means of automatic screw feeding. The mesh number of the screen is 150 mesh, and the vibration frequency of the screen is 1500 Hz. A slit scraping assembl...

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Abstract

The invention discloses a dry preparation process of a pole piece. The preparation process comprises the steps of S1 mixing an active substance, a conductive agent, a thermoplastic elastomer and a solvent; dissolving the thermoplastic elastomer in the solvent; and drying the mixed solution to obtain thermoplastic elastomer coated dry powder; S2 uniformly distributing the dry powder obtained in thestep S1 on the surface of a current collector; scraping the surface of the dry powder and adjusting the thickness of a dry powder layer; S 3 heating the pole piece with the dry powder layer; and S4 rolling the pole piece with the single-sided dry powder layer by a hot roller to obtain a single-sided pole piece finished product, or repeating the step S2 and the step S3 on the other side of the current collector in the pole piece obtained in the step S3, and rolling the pole piece with the double-sided dry powder layer by the hot roller to obtain a double-sided pole piece finished product. Thedry preparation process of the pole piece is reasonable in steps. The active substances, the conductive agent and the thermoplastic elastomer in the obtained pole piece are uniformly distributed. Thepole piece has good flexibility. The invention further discloses a continuous production device of the pole piece.

Description

technical field [0001] The invention relates to the technical field of production of lithium battery materials, in particular to a dry preparation process for pole pieces and continuous production equipment for pole pieces. Background technique [0002] The pole piece production process of lithium-ion batteries is closely related to battery quality. It is an important step in controlling the yield rate of batteries, and it is also one of the key points of cost control. [0003] The common pole piece manufacturing process includes three steps of slurry mixing, coating and drying and rolling: in the slurry mixing process, water or NMP, which accounts for more than 50%wt of the overall mass, is generally used as a solvent, and active materials, binders and conductive materials are added. The agent is made into a slurry with a certain viscosity by stirring or extruding with a screw; in the coating process, the slurry obtained by mixing the slurry is coated with a certain thickne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/139H01M4/62H01M10/0525
CPCH01M4/0404H01M4/0435H01M4/139H01M4/622H01M10/0525Y02E60/10
Inventor 夏咸兵杨六香赵钰芳王进
Owner LINKDATA NEW ENERGY CO LTD
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