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Preparation method of dry-method electrode pole piece, electrode pole piece and battery cell

An electrode pole piece and dry method technology, which is applied in the field of battery preparation, can solve the problems of self-supporting membrane hole edges, uneven feeding, and excessive material volume, and achieve the goal of improving the poor uniformity of the membrane and improving the quality and performance. Effect

Active Publication Date: 2021-12-31
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, this technology is still in the initial stage of research and development, and there are many problems that need to be solved urgently, such as in the preparation process of the pole piece, such as the degree of fiberization of the binder in the mixing stage Insufficient, then the self-supporting film that can be formed into sheets cannot be obtained during subsequent rolling; if the degree of fibrosis is too high, the volume of the obtained material is likely to be too large and hard, and the material is likely to be unevenly discharged during rolling and cause uneven discharge , there are holes or uneven edges on the obtained self-supporting film

Method used

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  • Preparation method of dry-method electrode pole piece, electrode pole piece and battery cell
  • Preparation method of dry-method electrode pole piece, electrode pole piece and battery cell
  • Preparation method of dry-method electrode pole piece, electrode pole piece and battery cell

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preparation example Construction

[0031] The invention relates to a preparation method of a dry-process electrode pole piece, which comprises the steps of preparing a fibrous mixed material from raw material powder, stirring and sieving the mixed material to obtain a pole piece powder, and the pole piece powder The step of preparing electrode pole pieces after processing.

[0032] In the preparation method of the dry electrode pole piece of the present invention, after going through powerful fibrosis steps such as ultra-high-speed stirring or grinding, the obtained material has a high degree of fibrosis, and can be formed into agglomerates by lightly kneading by hand. The raw material is stirred slowly at low speed first, and then stirred quickly at high speed to obtain agglomerated material with small particles. The material passes through the screen, and the screened granular material is directly fed into the roller press to obtain a sheet of self-supporting film directly. The self-supporting film has good s...

Embodiment 1

[0064] According to the positive electrode active material NCM811 (NCM represents its main components nickel, cobalt, manganese, while 811 represents the ratio of the three components 8:1:1) accounted for 92% by weight, and the conductive agent SP accounted for 2% by weight , Conductive agent activated carbon accounts for 2% by weight, binder PTFE accounts for 4% by weight, negative electrode active material Gr accounts for 97% by weight, conductive agent SP accounts for 1% by weight, and binder PTFE accounts for 2% by weight The ratio is mixed and fiberized.

[0065] The obtained highly fibrous material is subjected to the "binder fiberization control process", that is, the material is put into a crescent knife mixer for slow stirring for 3 minutes, and fast stirring for 1 minute, and then the material is sieved through an 18-mesh sieve. , to obtain the regulated material after sieving.

[0066] Put the regulated material into the roller press and feed it to obtain a self-su...

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Abstract

The invention provides a preparation method of a dry-method electrode pole piece, an electrode pole piece and a battery cell. The preparation method of the dry-method electrode pole piece comprises the following steps of preparing a fibrillated mixed material from raw material powder, stirring and sieving the mixed material to obtain pole piece powder, and processing the pole piece powder to obtain the electrode pole piece. According to the preparation method of the dry-method electrode pole piece, the material fibration degree before feeding can be regulated and controlled by stirring and sieving the mixed material, so that the thickness of a rolled film is regulated and controlled, and the problems of poor uniformity and poor neatness of the film are solved, so that the electrode pole piece prepared by the method is used for preparing a battery cell, and the quality and the performance of the battery cell are favorably improved.

Description

technical field [0001] The invention relates to the technical field of battery preparation, in particular to a method for preparing dry-process electrode pole pieces, and at the same time, the invention also relates to an electrode pole piece prepared by applying the method, and an electric core prepared from the electrode pole piece. Background technique [0002] The current dry electrode preparation technology only needs to mix the active material with the binder and then carry out hot rolling to complete the preparation of the electrode sheet. The preparation process does not require the addition of NMP solvents and the drying recovery process, which not only greatly simplifies The preparation process of the pole piece can greatly reduce the cost of battery manufacturing, and at the same time, there is no use of harmful solvents in the whole process, which also solves the problem of environmental pollution caused by the battery manufacturing process. [0003] However, thi...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/139H01M4/13H01M10/052
CPCH01M4/04H01M4/0435H01M4/139H01M4/13H01M10/052Y02E60/10
Inventor 肖强蔡挺威秦士林张耀法张超马忠龙
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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