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Test method for elongation, tensile strength and elastic modulus of binder

A technology of elastic modulus and tensile strength, which is applied in the direction of testing the ductility of materials and testing the strength of materials by applying stable tension/pressure, which can solve the problems of uneven film thickness, difficult film process and inability to test, To achieve the effect of improving stability and uniform thickness

Pending Publication Date: 2018-09-07
OPTIMUM BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the elastic modulus test of the adhesive needs to be made into a thin film of the adhesive, and then tested with a tensile tester, but the thin film process of the adhesive is relatively difficult, such as coating the adhesive on a glass plate, steel plate Or non-PTFE plastic board, after drying, the adhesive sticks to the substrate, it is not easy to peel off, and cannot be tested; another method is to apply the adhesive to the Teflon plastic board Although it solves the problem that the adhesive cannot be peeled off from the substrate, the film shrinks as the solvent volatilizes during drying, resulting in uneven thickness of the film and unreliable test results.

Method used

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  • Test method for elongation, tensile strength and elastic modulus of binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The binder used is styrene-butadiene rubber (SBR)

[0037] Step 1, dissolving styrene-butadiene rubber (SBR) in water to form a styrene-butadiene rubber solution with a viscosity of 50-15000mpa·s.

[0038] Step 2, coating the styrene-butadiene rubber solution on the aluminum foil, the coating thickness of the styrene-butadiene rubber solution is 400 μm, and the coating area is 150mm*50mm; Forms a uniform and transparent film.

[0039] Step 3, cutting the aluminum foil adhered with the film into sheets with a size of 100mm*15mm.

[0040] Step 4, the sheet is placed in a hydrochloric acid solution with a mass fraction of 50%, the aluminum foil in the sheet is dissolved in the hydrochloric acid solution to form a glue layer; the glue layer is washed with distilled water, A transparent adhesive film was obtained. The surface of the adhesive film was wiped with talc.

[0041] In step 5, the adhesive film is subjected to an elastic modulus test.

[0042] Specifically, th...

Embodiment 2

[0044] On the basis of Example 1, the difference is that acrylate (PAA) is selected as the binder, and the same method is used to test the elongation, tensile strength and elastic modulus of the acrylate (PAA) binder film, as shown in Table 1.

Embodiment 3

[0046] On the basis of embodiment 1, the difference is that choosing soluble polyimide (SPI) is the binding agent, and the elongation, tensile strength and modulus of elasticity of polyimide (SPI) binding agent film are tested in the same way, See Table 1.

[0047] Please refer to Table 1. The test values ​​of elongation, tensile strength and elastic modulus of three different adhesive films are shown in Table 1 below:

[0048] Table 1 Test data of three adhesive films

[0049] binder

Elongationε / %

Tensile strengthσ / Mpa

Elastic modulus E / Mpa

Styrene Butadiene Rubber (SBR)

450.5

3.1

0.007

Acrylate (PAA)

303.3

5.6

0.018

Polyimide (SPI)

17.6

7.5

0.426

[0050] According to Table 1, the polyimide (SPI) adhesive has the largest elastic modulus, so the stress that causes the polyimide (SPI) adhesive to undergo a certain elastic deformation is also greater, that is, under a certain stress , the smaller the el...

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Abstract

A test method for elongation, tensile strength and elastic modulus of a binder comprises the following steps: preparing a binder raw material into a binder solution having a viscosity of 50 to 15000 mPas, coating a metal foil with the binder solution with a thickness of 300 to 400 mum; baking at 60 DEG C to 100 DEG C for 6 to 8 hours to form a binder film on the metal foil; cutting the metal foilbonded with the binder film into sheets with a length of 50 to 200 mm and a width of 15 to 20 mm; placing the sheets in a hydrochloric acid solution having a mass fraction of 30% to 70% to dissolve the metal foil in the sheets into the hydrochloric acid solution to form a gel layer; washing the gel layer with distilled water to obtain the binder film, and finally testing the elastic modulus of thebinder film. The test method for the elongation, tensile strength and elastic modulus of the binder can conveniently and quickly test the performance of the binder in a lithium ion battery, and provides a reliable basis for screening of the binder.

Description

【Technical field】 [0001] The invention relates to the technical field of adhesives, in particular to a method for testing adhesive elongation, tensile strength and elastic modulus. 【Background technique】 [0002] Binder is an important part of lithium-ion batteries, although its amount is small, it plays a vital role in lithium-ion batteries. The main purpose of adding a binder to the electrode is to adhere to the active electrode material and the conductive agent, so that the components of the pole piece are in good contact with the current collector; at the same time, the internal structure of the pole piece is stabilized, and the volume of the electrode material during the process of deintercalating lithium is alleviated. Shrinkage expands. The physical properties of the binder directly affect the physical and chemical properties of the slurry, the processing performance of the pole piece, and then affect the electrochemical performance and safety performance of the batt...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/28
CPCG01N3/08G01N3/28
Inventor 王振峰邓昌源许辉李金林李路伟
Owner OPTIMUM BATTERY CO LTD