Abstract: Whether the electrode coating is easy to fall off is an important factor affecting the battery performance and life. In this paper , the peeling force value of the surface coating of the electrode sample was tested by the 180 degree peeling test, and the test principle, the parameters of the XLW (PC) intelligent electronic tensile testing machine, the applicable range, the test process, etc. were introduced. The adhesion fastness of the layer provides a reference.
Key words : electrode coating, adhesion fastness, peel force value, 180 degree peeling, intelligent electronic tensile testing machine, coating shedding
1 , meaning
Depending on the coating material and the type of electrode, the electrode coating has many functions, such as good electrochemical activation and improved oxidation resistance of the electrode. The degree of adhesion of the coating on the surface of the electrode is an important factor determining whether the coating can fully exert the above functions. If the adhesion of the coating is poor or even falls off, the activation and anti-oxidation functions will be reduced or even lost. Electrode failure, severe loss, greatly reduce battery life. With the promotion and application of batteries in the fields of automobiles, power storage, mobile communications, new energy storage power sources, and navigation, the service life of batteries is more important, so it is more important to attach the electrode coating. Degree of detection and research. This paper presents an effective test method for detecting the adhesion fastness of coatings.
Figure 1 Example of coated electrode
2 , test samples
In this paper, a black coated electrode sheet is used as a test sample.
3 , the test basis
At present, the test method standards related to the adhesion fastness of the electrode coating have not been released in China. The sample preparation part of this test is carried out according to the bonding strength of the ink layer in GB/T 7707-2008 "Gravure Decoration Print". The process is carried out according to GB 8808-1988 "Soft Composite Plastic Material Peel Test Method".
4 , test equipment
In this test, the peel strength of the sample was tested using an XLW (PC) intelligent electronic tensile testing machine.
4.1 Test principle
This test evaluates the adhesion of the coating to the electrode surface by testing the adhesive tape to remove the coating from the electrode surface. During the test, the test is clamped in the lower clamp, the clamp is fixed, and the free end of the tape used for the adhesive coating is fixed in the upper clamp, and the clamp can be moved upward according to the set speed, thereby driving the adhesive tape to remove the coating from the coating. The electrode surface is peeled off. The force value sensor of the upper clamp configuration records the force value generated by the peeling process in real time, and the average value of the force value is recorded as the peeling force value of the electrode coating.
Figure 2 XLW (PC) intelligent electronic tensile testing machine
4.2 Equipment parameters
The 500 N and 50 N force sensors are available, with a test accuracy of 0.5 , which is used in the industry to ensure the accuracy of the test results. According to the relevant standards, the device provides 50 mm/min. , 100 mm / min, 150 mm / min, 200 mm / min, 250 mm / min, 300 mm / min, 500 mm / min test speed seven kinds can be set according to the test requirements of the standard free; (1000 mm) long stroke It can meet the test of material with large deformation rate; intelligent configuration such as limit protection, overload protection, automatic return and power-down memory to ensure the user's operation safety; one test machine integrates seven independent types of stretching, peeling and tearing. The test program provides users with a choice of test items.
4.3 Scope of application
(1) This equipment can be used for peeling strength properties, tensile properties, tensile strength, tensile strength and deformation rate, tear resistance, heat seal strength performance, puncture resistance, etc. of plastic film, composite film, sheet and other materials. Test of indicators; can be used for infusion bag cover, soft rubber stopper, oral liquid cap puncture / pull force test; can be used for tape unwinding force, plastic bottle anti-pressure, combination cover and jelly cup, yogurt cup cover film opening Testing of products and packaging properties such as force.
(2) This equipment can meet ISO 37 , GB/T 10004 , GB 8808 , GB/T 1040.1 , GB/T 1040.2 , GB/T 1040.3 , GB/T 1040.4 , GB/T 1040.5 , QB/T 2358 , QB/ More than 20 domestic and international standards such as T 1130 , ASTM D882 , ASTM D1938 , and ASTM D3330 .
5 , the test process
(1) from a sample containing the electrode width of a surface coating. Cut 15.0 mm, sample length of 100 mm 5, cut out to a width from 15.0 mm to meet the standards of the adhesive tape, length of at least 250 mm of the adhesive tape 5 article.
(2) 5 respectively adhered to the adhesive tape sample 5, the width direction of both should be fully aligned with the adhesive strip pasting machine press roll of adhesive tape sample was good pressure roller 3, is placed 10 Min .
(3) Set parameter information such as sample name, test speed, invalid head length, and invalid tail length on the control software of the device.
(4) The free end of the adhesive tape and the sample are respectively clamped in the upper and lower fixtures of the device. Click the test option and the test starts. The upper clamp moves upward to peel off the coated adhesive tape from the sample electrode. After the test, the device displays the test result. The remaining 4 samples were tested according to this loading test procedure .
6 , test results
The test results of 5 samples tested in this test were 0.831 N/15mm , 0.806 N/15mm , 0.846 N/15mm , 0.811 N/15mm , 0.795 N/15mm , respectively, and the coating of the sample was peeled off from the electrode surface. The required force is 0.818 N/15mm .
7 , conclusion
The adhesion fastness of the coating on the electrode surface is an important factor affecting the battery life. In this paper, the 180- degree peeling test method is used to test the force value required to peel the coating from the surface of the electrode sample, and to characterize the adhesion fastness of the coating on the electrode surface. The test is simple, and the equipment is easy to operate, and the test result is accurate and reliable. . In order to better simulate the actual application environment of the electrode, the prepared sample can be placed in a high temperature environment for a period of time to test according to the actual situation. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in R&D, production and packaging inspection services for packaging inspection equipment. The existing equipment can test the performance performance of packaging materials such as barrier performance, physical and mechanical properties, and hygienic performance . The more you understand, the more you trust! Labthink is looking forward to enhancing technical communication and cooperation with enterprises and institutions in the industry.
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