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Method for quantitative and homogenous analysis of gluing diaphragm material in lithium ion battery

A technology for lithium-ion batteries and diaphragm materials, which is applied in the field of qualitative and uniformity analysis of rubber-coated diaphragm materials in lithium-ion batteries. It can solve problems such as high environmental requirements, affecting test results, and difficulty in distinguishing coating methods. The effect of less dosage and accurate test results

Inactive Publication Date: 2017-09-15
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these methods can quickly and conveniently analyze the base film and coating in the separator.
Some articles have reported the use of infrared absorption spectroscopy to qualitatively analyze the diaphragm, but this method cannot determine the coating method of the diaphragm, such as whether the coating layer is coated on one side or both sides of the base film, especially for various coating substances It is even more difficult to distinguish the coating method; in addition, the infrared spectrometer has high requirements on the environment, and the ambient humidity and carbon dioxide in the air will affect the test results

Method used

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  • Method for quantitative and homogenous analysis of gluing diaphragm material in lithium ion battery
  • Method for quantitative and homogenous analysis of gluing diaphragm material in lithium ion battery
  • Method for quantitative and homogenous analysis of gluing diaphragm material in lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Using a Raman spectrometer, carry out Raman spectroscopic detection on the standard samples PP, PE, PVDF, and ceramics with known components in the diaphragm material, and the Raman spectrograms are as follows figure 1 and collect the Raman characteristic peak position data in each Raman spectrogram, then set up the Raman spectrum characteristic peak position database, as shown in Table 1;

[0030] (2) Under the same test conditions as step (1), use a Raman spectrometer to detect the Raman spectrum of the rubberized diaphragm sample to be tested, so as to obtain its Raman spectrum and Raman imaging; In the case of Raman spectroscopy, if there are phenomena such as poor signal-to-noise ratio and strong background signal in Raman spectroscopy, spectral smoothing, baseline correction and other processing methods can be adopted, which will not affect the Raman shift.

[0031] (3) compare the Raman characteristic peak position in the Raman spectrogram of the rubber-coate...

Embodiment 2

[0034] According to the analysis method of Example 1, the two sides of the rubber-coated diaphragm sample 1 to be tested are respectively subjected to Raman spectrum detection with a Raman spectroscopic analyzer, and the two sides of the diaphragm are respectively marked as diaphragm 1 and diaphragm 2, under the same conditions Next test its Raman spectrum, and extract its Raman peak position; then compare with Table 1, qualitative:

[0035] As shown in the comparison results in Table 1, it can be seen that the Raman spectrum peak position in diaphragm 1 is 793.57cm -1 、836.64cm -1 、1433.95cm -1 、2976.97cm -1 The isopeak position belongs to the characteristic peak of polyvinylidene fluoride, 1060.28cm -1 、1125.90cm -1 、1291.58cm -1 、2844.54cm -1 、2878.86cm -1 The equal peak position is attributed to the peak position of polyethylene, 3630.37cm -1 、3850.20cm -1 、3982.05cm -1 It can be attributed to ceramics, and the peak shape, relative displacement, and relative inte...

Embodiment 3

[0039] Using the membrane 2 in Example 2 as a test sample, a certain test area is selected by mediating the movement of the platform of the Raman spectrometer, and the spectrum of the area is collected. Such as figure 2 It is the Raman spectrum imaging of the local area of ​​the rubber-coated diaphragm (diaphragm 2). In the figure, the 838cm peak of the PVDF Raman spectrum is selected -1 as its characteristic peak. figure 2 Medium 838cm -1 The intensity distribution is not uniform, indicating poor uniformity of the coating PVDF in separator 2.

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Abstract

The invention discloses a method for quantitative and homogenous analysis of a gluing diaphragm material in a lithium ion battery. The method comprises the following steps: using a Raman spectrometer to perform a Raman spectroscopy detection on standard samples of all known components in the diaphragm material respectively, acquiring Raman characteristic peak position data in each Raman spectrum, and then establishing a database; performing Raman spectroscopy detection on a to-be-detected gluing diaphragm sample under same conditions to acquire a Raman spectrogram and a Raman image respectively; comparing to obtain composition of the to-be-detected gluing diaphragm sample; performing a Raman spectroscopy imaging test on a gluing region of the to-be-detected gluing diaphragm sample; and utilizing strength distribution of a characteristic peak position in the Raman spectrogram of a gluing substance to judge the gluing homogeneity in the to-be-detected gluing diaphragm sample. The method can rapidly perform quantitative analysis on components of a gluing diaphragm, and can reflect coating distribution of the gluing diaphragm by a Raman imaging technology, thereby indirectly inspecting the stability and homogeneity of a production process.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a qualitative and uniformity analysis method for a rubber-coated diaphragm material in a lithium-ion battery. Background technique [0002] Lithium-ion battery is a secondary battery with the advantages of high voltage platform, high energy density, no memory effect, and long cycle life. It is mainly used in modern products such as mobile phones, digital cameras, notebook computers, and electric vehicles. A lithium-ion battery is mainly composed of a positive electrode, a negative electrode, an electrolyte, a diaphragm, and a casing. The diaphragm, as the "third pole" of the battery, is one of the key inner components of a lithium-ion battery. After the diaphragm absorbs the electrolyte, it can isolate the positive and negative electrodes to prevent short circuit and allow the conduction of lithium ions; when overcharging or temperature rises, the diaphragm blocks c...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 麻姗姗夏劲胡淑婉鲁扬
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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