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

AI Technical Summary

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

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

Example Embodiment

[0024] Example 1

[0025] (1) Preparation and treatment of electrode: according to quality than graphite negative electrode materials: carbon black conductive agent: thickener CMC: binder SBR (A) = 94: 2: 1.5: 2.5 Preparation of milk, then apply it On the copper foil, the density of the coating surface is 185 g · m -2 . During the oven drying, the pole speed is 2.5 m / min. After a rolling negative, the compact density is 1.6g · cm -3 . The negative electrode chip is cropped and the width is 5 cm and 8 cm electrode sheet, respectively. Such as figure 1 As shown, the electrode sheet comprises two layers of active material layer A surfaces 31 and B surface 32, and there is a pole collector 30 between the two-layer active material layers.

[0026] (2) Because of the binder mobility test:

[0027] S1 attached to the side of the double-sided adhesive 20 on the glass substrate 10, and the other surface is adhered to the active material layer B of the electrode sheet, scrape the powder s...

Example Embodiment

[0030] Example 2

[0031] The difference from Example 1 is that during the oven drying process, the pole is taken at 5 m / min to give MD (sample 2) to 1.33.

Example Embodiment

[0032] Example 3

[0033] Unlike Example 1, in the oven drying process, the length of the plate is 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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