CN114544486A - Method for testing adhesive force of adhesive in lithium battery pole piece to active material - Google Patents
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- 230000001070 adhesive effect Effects 0.000 title claims abstract description 99
- 239000000853 adhesive Substances 0.000 title claims abstract description 98
- 239000011149 active material Substances 0.000 title claims abstract description 67
- 238000012360 testing method Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 28
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 17
- 239000011230 binding agent Substances 0.000 claims abstract description 27
- 239000000758 substrate Substances 0.000 claims abstract description 25
- 239000002002 slurry Substances 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 239000011889 copper foil Substances 0.000 claims description 8
- 239000011888 foil Substances 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 14
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 13
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 13
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 13
- 239000002391 graphite-based active material Substances 0.000 description 13
- 229910001220 stainless steel Inorganic materials 0.000 description 10
- 239000010935 stainless steel Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 6
- 239000003292 glue Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920005822 acrylic binder Polymers 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920000083 poly(allylamine) Polymers 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 229920000058 polyacrylate Polymers 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 238000004451 qualitative analysis Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000001237 Raman spectrum Methods 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000037427 ion transport Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The invention relates to the field of battery testing, and provides a method for testing the adhesive force of an adhesive to an active material in a lithium battery pole piece, aiming at the problem of inaccurate test of the adhesive performance of a battery adhesive, which comprises the following steps: A. uniformly mixing an active material and a binder to prepare slurry, coating the slurry on a pole piece substrate, and drying to obtain an electrode piece E1; B. one surface of the first double-sided adhesive is adhered to a fixed substrate, and the other surface of the first double-sided adhesive is adhered to an active material layer of an electrode plate E1; C. stripping the pole piece substrate of the pole piece E1 from the active material layer to expose the reverse side of the active material layer; D. one side of the second double-sided adhesive is stuck to the reverse side of the active material layer; E. and fixing the fixed substrate on a base of the tension machine, fixing one end of the second double-sided adhesive on a clamp of the tension machine, and starting the tension machine to test to obtain a tension value. The method can simply, rapidly and accurately analyze the cohesive force between the adhesive and the active material.
Description
Technical Field
The invention relates to the field of battery testing, in particular to a method for testing the adhesive force of an adhesive to an active material in a lithium battery pole piece.
Background
In the production process of the lithium ion battery, the manufacture of the pole piece comprises the steps of homogenizing, coating, rolling and the like, and the core performance of the battery is related. In the battery pole piece, although the amount of the binder is small, the binder plays an important role in bonding, and not only can the active material be firmly adhered to the foil (the adhesion between the pole piece and the foil is called as peeling force), but also the active material particles can be adhered to each other (the acting force between the particles is called as cohesive force), so that the uniform distribution of the binder in the pole piece plays an important role. Although the binder can be uniformly dispersed among the active materials after being efficiently mixed and dispersed in the homogenizing process, a certain concentration gradient can be generated in the binder polymer solution or emulsion along with the volatilization of the solvent in the drying process, so that the binder is not uniformly distributed in the pole piece. When the binder is unevenly distributed, the pole piece has an area with little binder, the active material and the conductive agent are not firmly bonded, and the material falling phenomenon occurs when the pole piece is cut, stamped and laser-cut, so that the product quality and the production continuity are influenced. Material fallout can also occur when the binder is uniformly distributed but in insufficient quantities.
In addition, when the electrode plate is soaked and swelled by the electrolyte, the electrode plate rebounds and deforms, and the adhesive force of the adhesive to the active material is reduced; after the electrode plate is subjected to formation and grading, the active material in the electrode plate has certain volume change, certain stress is generated inside the electrode plate, and the adhesive force of the adhesive is reduced; particularly, when the cell is subjected to long-term cycling, adhesion between the active materials is deteriorated, electron and ion transport becomes difficult, and cell capacity fading is aggravated. Therefore, the binder plays a crucial role in maintaining the structural integrity of the pole piece, a method is needed for evaluating the binding power difference of different binders on an active positive electrode material or a negative electrode material, and the influence of the binder amount on the binding power of the active material, so that a novel binder with strong binding power and small usage amount is developed.
Patent CN102323249A discloses a qualitative analysis method for adhesive performance of an adhesive, which is to perform qualitative analysis on the adhesive performance of the adhesive by measuring the raman shift of a certain characteristic peak in the raman spectrum of a raman active material mixed in the adhesive, but the method cannot actually test the bonding force between the lithium ion battery adhesive and a current collector, and the obtained data is not mechanical property data and cannot truly represent the adhesive strength of the adhesive. Currently, there are few effective methods for measuring the adhesion between active materials and no effective data can be provided for battery formulation design. In the production process, the peeling force of the pole piece can be measured by a 180-degree peeling test of a tensile machine, and the adhesive force between the pole piece and the foil is smaller than the cohesive force between the pole piece material and the foil material, so the peeling test can measure the peeling force between the pole piece and the foil material, but the cohesive force between the active materials cannot be measured. Accordingly, an ideal solution is needed.
Disclosure of Invention
The invention provides a method for testing the adhesive force of an adhesive to an active material in a lithium battery pole piece, aiming at overcoming the problem of inaccurate test of the adhesive property of a battery adhesive, and the method can simply, quickly and accurately analyze the cohesive force between the adhesive and the active material.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for testing the adhesive force of an adhesive in a lithium battery pole piece to an active material comprises the following steps:
A. uniformly mixing an active material and a binder to prepare slurry, coating the slurry on a pole piece substrate, and drying to obtain an electrode piece E1;
B. one surface of the first double-sided adhesive is adhered to a fixed substrate, and the other surface of the first double-sided adhesive is adhered to an active material layer of an electrode plate E1;
C. stripping the pole piece substrate of the pole piece E1 from the active material layer to expose the reverse side of the active material layer;
D. one side of the second double-sided adhesive is stuck to the reverse side of the active material layer;
E. and fixing the fixed substrate on a base of the tension machine, fixing one end of the second double-sided adhesive on a clamp of the tension machine, and starting the tension machine to test to obtain a tension value.
Preferably, in the slurry in the step A, the mass fraction of the binder is 1-3%, and the solid content accounts for 40-60% of the total mass of the slurry; in the step A, the substrate of the pole piece is copper foil or aluminum foil; step by stepThe surface density of the coating applied in the step A is 100-120 g.m-2(ii) a In the step A, the drying condition is that the air-blast drying oven is used for drying, and the drying temperature is 40-80 ℃; and E, fixing the substrate to be a stainless steel plate.
Preferably, the peel strength between the first double-sided adhesive and the fixed substrate in the step B is 800-1000 mN.mm-1。
Preferably, the peel strength of the electrode plate substrate and the active material layer in step C is 10-30mN · mm-1。
Preferably, the other side of the second double-sided adhesive is adhered to the paper in the step D, and the peel strength between the second double-sided adhesive and the paper is 800-1000mN & mm-1. The paper is a A4 paper for printing.
Preferably, the width of the second double-sided adhesive in the step D is 5-10mm smaller than that of the active material layer.
Preferably, the peel strength of the second double-sided adhesive and the active material layer in the step D is less than 800mN & mm-1。
Preferably, the 180 ° peel is performed by a tensile machine in step E.
Preferably, the peeling rate of the tensile machine in the step E is 10-100mm min-1。
Therefore, the beneficial effects of the invention are as follows: (1) the method can simply, rapidly and accurately analyze the cohesive force between the binder and the active material. (2) The method is beneficial to quickly optimizing the formula of the adhesive and finding the lowest adhesive using amount to meet the cohesive force requirement of the pole piece. (3) Meanwhile, the distribution condition of the adhesive in the pole piece can be determined according to the measured cohesive force and the distribution condition. (4) In addition, when the novel adhesive is designed and synthesized, some units with strong cohesive force can be introduced to help design the adhesive with stronger cohesive force.
Drawings
FIG. 1 is a schematic of the testing of the present invention.
In the figure: 10-stainless steel plate; 20-first double-sided adhesive; 30-an active material layer; 40-second double-sided glue; 50-a binder; 60-active material.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
In the present invention, unless otherwise specified, all the raw materials and equipment used are commercially available or commonly used in the art, and the methods in the examples are conventional in the art unless otherwise specified.
Example 1
A method for testing the adhesive force of a binder in a lithium battery pole piece on an active material comprises the following steps:
1) weighing 3g of sodium carboxymethylcellulose (CMC) powder, adding 197g of water, stirring overnight, and preparing into a CMC glue solution with the mass fraction of 1.5%.
2) Then 9.9g of graphite active material is weighed, 6.7g of CMC glue solution is added, the mass ratio of the graphite active material to the CMC glue solution is 99:1, 3.4g of water is added, and magnetons are stirred for 6 hours to obtain uniform slurry, wherein the solid content of the slurry is 50%.
3) Then coating the slurry on a pole piece substrate copper foil, placing the pole piece substrate copper foil in a fume hood for airing, and then drying the pole piece substrate copper foil in a blast drying oven at the temperature of 80 ℃ for 2 hours, wherein the surface density of a pole piece coating is 100--2。
4) As shown in fig. 1, one side of a first double-sided adhesive 20 is attached to a stationary base stainless steel plate 10, and the other side is attached to an active material layer 30 of an electrode sheet E1; peeling off a base foil (not shown) of the electrode sheet E1 from the active material layer 30 to expose the reverse side of the active material layer 30; fixing one side of the second double-sided adhesive 40 on a printing a4 paper (not shown), cutting the paper into strips having a width smaller than that of the active material layer (specifically, strips having a width of 5 mm), and adhering the other side of the second double-sided adhesive 40 to the active material layer 30; fixing the stainless steel plate 10 on the base of the tension machine, fixing one end of the second double-sided adhesive 40 on the clamp of the tension machine, starting the test by the tension machine with the speed of 50 mm.min from one end-1The active material layer 30 is peeled off at 180 degrees at a rate of 0 degree, the adhesive 50 (namely the CMC glue solution in the step 1) and the active material 60 (namely the graphite active material in the step 2) are exposed), the average tensile force value is obtained by testing for 3 times, and the measured pole piece cohesion is 357mN mm-1。
Wherein the peel strength between the first double-sided adhesive 20 and the stainless steel plate 10 is 900mN mm-1(ii) a Pole piece substrate copper foil and activityThe peel strength of the material layer 30 was 20 mN. mm-1(ii) a The peel strength of the second double-sided adhesive 40 from paper was 900mN mm-1(ii) a The peel strength of the second double-sided adhesive 40 from the active material layer 30 was 600mN mm-1。
Example 2
The difference from example 1 is that the mass ratio of graphite active material to CMC was 98: 2. The cohesion of the pole piece was measured to be 656mN mm.
Example 3
The difference from example 1 is that the mass ratio of graphite active material to CMC is 97: 3. The cohesive force of the pole piece is 796 mN.mm-1。
Example 4
The difference from example 1 is that the mass ratio of graphite active material to CMC is 96: 4. The cohesive force of the pole piece is 803mN mm-1。
Example 5
The difference from example 1 is that the binder is an acrylic binder BA290S and the mass ratio of graphite active material to BA290S is 97: 3. The measured cohesion of the pole piece is 814 mN.mm-1。
Example 6
The difference from example 1 is that the binder is acrylic binder LA136D and the mass ratio of graphite active material to LA136D is 97: 3. The measured cohesive force of the pole piece is 784 mN.mm-1。
Example 7
The difference from example 1 is that the binder is an acrylic binder AG, and the mass ratio of the graphite active material to AG is 97: 3. The measured cohesion of the pole piece is 830 mN.mm-1。
Example 8
The difference from example 1 is that the binder is polyvinyl alcohol PVA1788 and the mass ratio of graphite active material to PVA1788 is 97: 3. The measured cohesion of the pole piece is 210 mN.mm-1。
Example 9
The difference from example 1 is that the binder is lithium polyacrylate, LiPAA, and the mass ratio of the graphite active material to PVA1788 is 97: 3. The measured cohesion of the pole piece is 234 mN.mm-1。
Example 10
The difference from example 1 is that the binder is polyacrylamide PAAm and the mass ratio of the graphite active material to PVA1788 is 97: 3. The measured cohesion of the pole piece is 220 mN.mm-1。
Example 11
The difference from example 1 is that the peel strength between the first double-sided adhesive 20 and the stainless steel plate 10 is 800mN mm-1(ii) a The peel strength between the copper foil of the electrode plate substrate and the active material layer 30 was 10 mN.mm-1(ii) a The peel strength of the second double-sided adhesive 40 from paper was 800mN mm-1(ii) a The peel strength of the second double-sided adhesive 40 from the active material layer 30 was 500mN mm-1. The measured cohesion of the pole piece is 350 mN.mm-1。
Example 12
The difference from example 1 is that the peel strength between the first double-sided adhesive 20 and the stainless steel plate 10 is 1000mN mm-1(ii) a The peel strength between the copper foil of the electrode plate substrate and the active material layer 30 is 30 mN.mm-1(ii) a The peel strength of the second double-sided adhesive 40 from paper was 1000 mN. mm-1(ii) a The peel strength of the second double-sided adhesive 40 from the active material layer 30 was 800mN mm-1. The measured cohesive force of the pole piece is 353mN mm-1。
Comparative example 1
The difference from example 4 is that the peel strength between the first double-sided adhesive 20 and the stainless steel plate 10 is 600mN mm-1。
Comparative example 2
The difference from example 4 is that the peel strength of the second double-sided adhesive 40 from the active material layer 30 was 600mN mm-1。
Analysis of results
As can be seen from examples 1-4, on the one hand, it is demonstrated that the cohesion of the graphite active material measured gradually increases as the CMC content increases. The cohesion does not change much when the CMC content is increased from 3% to 4%. On the other hand, the testing method disclosed by the invention is accurate in testing, and the cohesive force change caused by the change of the CMC content can be obviously detected. According to examples 5-7, the graphite adhesion and CMC phase of polyacrylic binders, such as BA290S, LA136D and AGWhen all are 800 mN.mm-1Left and right. According to examples 8 to 10, polyvinyl alcohol PVA1788, lithium polyacrylate LiPAA and polyacrylamide PAAm, have a weaker adhesion to graphite than CMC. The method can help us to quickly optimize the adhesive formula and find the lowest adhesive using amount to meet the cohesive force requirement of the pole piece. Meanwhile, according to the measured cohesive force and distribution condition, the distribution condition of the adhesive in the pole piece can be determined. In addition, when the novel adhesive is designed and synthesized, units with strong cohesive force can be introduced, and the adhesive with stronger cohesive force is designed.
It can be seen from examples 1, 11 and 12 that the change in peel strength within a reasonable range has little effect on the test results. However, when the peeling strength exceeds a reasonable range, the test result is affected, for example, in comparative example 1, the glass strength of the first double-sided adhesive and the stainless steel plate is too low and even lower than the cohesive force of the active material, and the first double-sided adhesive and the stainless steel plate are preferentially peeled off in the peeling process of the tensile machine, so that the test result is affected; in comparative example 2, too low peel strength of the second double-sided adhesive 40 from the active material layer 30 causes the same problem. Therefore, it is an innovative result of the inventors that the peel strength of the present invention needs to be set within a reasonable range.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A method for testing the adhesive force of an adhesive in a lithium battery pole piece to an active material is characterized by comprising the following steps:
A. uniformly mixing an active material and a binder to prepare slurry, coating the slurry on a pole piece substrate, and drying to obtain an electrode piece E1;
B. one surface of the first double-sided adhesive is adhered to a fixed substrate, and the other surface of the first double-sided adhesive is adhered to an active material layer of an electrode plate E1;
C. stripping the pole piece substrate of the pole piece E1 from the active material layer to expose the reverse side of the active material layer;
D. one side of the second double-sided adhesive is stuck to the reverse side of the active material layer;
E. and fixing the fixed substrate on a base of the tension machine, fixing one end of the second double-sided adhesive on a clamp of the tension machine, and starting the tension machine to test to obtain a tension value.
2. The method for testing the adhesive force of the adhesive in the lithium battery pole piece to the active material as claimed in claim 1, wherein the pole piece substrate in the step A is copper foil or aluminum foil.
3. The method as claimed in claim 1, wherein the peel strength of the first double-sided adhesive and the fixing substrate in step B is 800-1000 mN-mm-1。
4. The method for testing the adhesion of the adhesive to the active material in the lithium battery pole piece as claimed in claim 1, wherein the peel strength of the pole piece substrate and the active material layer in the step C is 10-30 mN-mm-1。
5. The method for testing the adhesive force of the adhesive to the active material in the lithium battery pole piece as claimed in claim 1, wherein the other side of the second double-sided adhesive is adhered to the paper in the step D, and the peel strength between the second double-sided adhesive and the paper is 800-1000 mN-mm-1。
6. The method for testing the adhesive force of the adhesive to the active material in the lithium battery pole piece according to claim 1, wherein the width of the second double faced adhesive in the step D is 5-10mm smaller than that of the active material layer.
7. The method for testing the adhesive force of the adhesive in the lithium battery pole piece to the active material according to claim 1, 5 or 6, wherein the peel strength of the second double-sided adhesive and the active material layer in the step D is less than 800 mN-mm-1。
8. The method for testing the adhesive force of the adhesive in the lithium battery pole piece to the active material as claimed in claim 1, wherein the tensile machine in the step E peels 180 degrees.
9. The method for testing the adhesive force of the adhesive in the lithium battery pole piece to the active material as claimed in claim 1 or 8, wherein the peeling rate of a tensile machine in the step E is 10-100 mm-min-1。
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| CN102519873A (en) * | 2011-12-26 | 2012-06-27 | 同济大学 | Method for evaluating durability of steel bridge deck pavement waterproof bonding system |
| CN108072605A (en) * | 2017-11-27 | 2018-05-25 | 惠州拓邦电气技术有限公司 | A kind of test method of electrodes of lithium-ion batteries peel strength |
| CN109870353A (en) * | 2018-12-21 | 2019-06-11 | 东莞东阳光科研发有限公司 | A kind of test method of electrodes of lithium-ion batteries peel strength |
| CN112945846A (en) * | 2021-01-26 | 2021-06-11 | 江西安驰新能源科技有限公司 | Pole piece bonding performance evaluation method |
| CN113363670A (en) * | 2021-04-30 | 2021-09-07 | 万向一二三股份公司 | Diaphragm and lithium ion battery comprising same |
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