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Method for testing mobility of binder in lithium ion battery pole piece

A lithium-ion battery and testing method technology, which is applied in the field of binder mobility testing in lithium-ion battery pole pieces, can solve problems such as inconvenient binder mobility testing, achieve accurate measurement values, and optimize the preparation process.

Pending Publication Date: 2021-07-20
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the inconvenient problem of testing the mobility of the binder in the pole piece of the lithium-ion battery, the present invention provides a method for testing the mobility of the binder in the pole piece of the lithium-ion battery, which can simply, quickly and accurately test the mobility of the binder in the pole piece. Binder migration value

Method used

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  • Method for testing mobility of binder in lithium ion battery pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Electrode preparation and processing: prepare the slurry by mass ratio of graphite negative electrode material: carbon black conductive agent: thickener CMC: binder SBR (A)=94:2:1.5:2.5, and then apply it Spread on copper foil, the coating surface density is 185g m -2 . During the drying process in the oven, the pole piece travels at a speed of 2.5m / min. After rolling the negative electrode once, the compacted density is 1.6g cm -3 . The negative electrode sheet is cut into electrode sheets whose length and width are 5 cm and 8 cm, respectively. Such as figure 1 As shown, the electrode sheet includes two active material layers A-side 31 and B-side 32, and an electrode sheet current collector 30 is arranged between the two active material layers.

[0026] (2) Binder mobility test in battery pole piece:

[0027] S1 Stick one side of the double-sided adhesive tape 20 on the glass substrate 10, and stick the other side on the active material layer B surface of the...

Embodiment 2

[0031] The difference from Example 1 is that during the drying process in the oven, the electrode piece travels at a speed of 5 m / min, and the MD (sample 2) obtained is 1.33.

Embodiment 3

[0033] The difference from Example 1 is that during the drying process in the oven, the pole piece travels at a speed of 7.5 m / min, and the MD (sample 3) is 1.50.

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Abstract

The invention belongs to the field of lithium battery manufacturing, and provides a method for testing the mobility of a binder in a lithium ion battery pole piece aiming at the problem that the mobility of the binder in the lithium ion battery pole piece is inconvenient to test. The lithium ion battery pole piece comprises two active material layers, namely a surface A and a surface B. A pole piece current collector is arranged between the two active material layers. The testing method comprises the following steps: adhering one surface with a double-sided adhesive tape to a glass substrate, adhering the other surface of the double-sided adhesive tape to the surface B of the active material layer, scraping a powder sample on the surface layer of the surface A of the active material layer, and marking the powder sample as a surface layer sample A; stripping the pole piece current collector to expose the reverse side of the surface B of the active material layer, scraping a powder sample, and marking the powder sample as a bottom layer sample B; respectively carrying out thermogravimetric analysis on the sample A and the sample B, measuring the mass loss of the active material in the sample A and the sample B, and calculating the mobility value as wt (top)% / wt (bottom)%. The method can be used for simply, quickly and accurately testing the migration value of the binder in the pole piece.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery preparation, in particular to a method for testing the mobility of a binder in a lithium-ion battery pole piece. Background technique [0002] Lithium-ion batteries have the characteristics of high working voltage, high specific capacity, high energy density and long cycle life, and are becoming the most promising chemical power source and energy storage device in the world today. Soft-pack batteries have the advantages of flexible design, light packaging and no explosion, and are gradually being favored by the market. However, in the process of use, there is a certain volume deformation of the pouch battery, and the uneven stress distribution in the pole piece will cause the deformation of the battery, which poses a safety hazard. The uneven distribution of the binder in the pole piece is the cause of the internal stress of the pole piece. important reason. [0003] In the electrode...

Claims

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Application Information

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IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 黄清泉项青李慧
Owner WANXIANG 123 CO LTD
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