Rapid evaluation method for material consistency of lithium-ion battery separators
A lithium-ion battery and evaluation method technology, which is applied in the field of rapid evaluation of the material consistency of lithium-ion battery diaphragms, can solve the problems of high cost, long time for diaphragm performance testing, and inability to guarantee the consistency of diaphragm materials and production process stability, etc., to achieve good consistency effect
Active Publication Date: 2016-05-18
CHINA NAT ELECTRIC APP RES INST
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Problems solved by technology
[0005] Diaphragm performance testing takes a long time and costs high, and passing the performance test can ensure that the diaphragm meets the performance requirements of lithium-ion batteries, but random sampling cannot guarantee the consistency of the diaphragm material and the stability of the production process, and does not fundamentally solve the problem of diaphragm production. Enterprises' demand for material consistency control technology
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[0045] The material consistency rapid evaluation method of lithium-ion battery diaphragm of the present invention, such as figure 1 As shown, through the material analysis, morphology observation and porosity test of the standard diaphragms that have passed the performance test and the establishment of a standard database, the sample diaphragms are also subjected to material analysis, morphology observation and porosity tests under the same test conditions, and then The established standard database was used to evaluate the consistency of the sample diaphragm and the standard diaphragm.
[0046] In order to establish a standard database, first proceed as follows:
[0047] a) According to the standard "GB / T6040-2002 General Rules for Infrared Spectral Analysis Methods", conduct an infrared spectrum test on the standard diaphragm, and mark its main characteristic peaks;
[0048] b) According to the standard "ISO11358:1997 Thermogravimetric Analysis (TG) General Principles of P...
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A method for rapidly evaluating material consistency of a lithium-ion battery separator, comprising the following steps: Step 1: performing infrared spectrum analysis, thermogravimetric analysis, differential scanning calorimetry analysis, morphology observation, and porosity analysis on a standard separator that has passed the performance test. Test, establish a standard database for recording the data of various tests of the standard diaphragm; Step 2: Under the same test conditions, use the same method to perform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, and Morphology observation and porosity test, and compare the test results with the results in the standard database; Step 3: Judging that the material of the sample diaphragm is consistent with the standard diaphragm. The invention can quickly evaluate the material consistency of the sample diaphragm and the standard diaphragm, and can better reflect the stability of the production process and the consistency of the material.
Description
technical field [0001] The invention relates to a method for quickly evaluating the material consistency of lithium-ion battery separators by using modern instrument analysis technology. Background technique [0002] Lithium-ion batteries are composed of positive and negative electrode materials, electrolyte, separator and battery case. As the "third pole" of the battery, the separator is one of the key inner components in a lithium-ion battery. [0003] In my country, the raw materials of lithium-ion batteries have basically been localized, but the separator mainly relies on imports, and some key technologies for making separators are monopolized by Japan, Europe and the United States. In recent years, the three types of polyolefin separators in China have been gradually marketed, partially replacing imported products in the low-end and mid-end markets, and a small number of products have entered the high-end market. However, in the process of mass production of diaphragm...
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IPC IPC(8): H01M2/16H01M10/42H01M50/409
CPCH01M10/4285H01M50/403Y02E60/10
Inventor 胡利芬彭坚刘鑫郭燕芬
Owner CHINA NAT ELECTRIC APP RES INST