SEM-EDS combined test method for metal foreign matters in lithium battery material

A technology of SEM-EDS and metal foreign matter, which is applied in the field of SEM-EDS combined testing of metal foreign matter in lithium battery materials, can solve problems such as poor accuracy of test results, achieve long service life, ensure consistency, and ensure accuracy Effect

Inactive Publication Date: 2019-12-13
JINCHUAN GROUP LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a SEM-EDS combined test method for metal foreign matter in lithium battery materials, so as to solve the problem of poor detection result accuracy existing in existing SEM detection methods

Method used

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  • SEM-EDS combined test method for metal foreign matters in lithium battery material
  • SEM-EDS combined test method for metal foreign matters in lithium battery material
  • SEM-EDS combined test method for metal foreign matters in lithium battery material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A. Weigh 200g of cobalt hydroxide, the precursor of lithium battery cathode material, and place it in a 500mL plastic test bottle, put it into a qualified clean magnet (with a magnetic field strength of 5500GS), fill it with high-purity water, shake it up and down for 10 times, and put the test bottle in In the mixer, mix clockwise and counterclockwise for 15 minutes at the mixer speed of 120r / min, then take it off;

[0038] B. After the mixing is completed, take off the test bottle, pour out the sample slurry in the test bottle, take out the magnet, rinse the adhered material 4 times with high-purity water, then put the magnet into a 400mL beaker and add water until the magnet is completely covered. Place the beaker in an ultrasonic instrument for ultrasonic cleaning for 30 seconds, then remove the magnet, wash it with high-purity water three times, then wash it once with absolute ethanol, and dry it naturally;

[0039] C. Cut the conductive tape according to the size ...

Embodiment 2

[0045] A. Weigh 200g of cobalt tetroxide, the precursor of lithium battery cathode material, and place it in a 500mL plastic test bottle, put it into a qualified clean magnet (magnetic field strength of 6000GS), fill it with high-purity water, shake it up and down for 10 times, and place the test bottle in a mixing chamber. In the homogenizer, mix clockwise and counterclockwise for 15 minutes at the speed of the mixer at 120r / min, then take it off;

[0046] B. After the mixing is completed, take off the test bottle, pour out the sample slurry in the test bottle, take out the magnet, rinse the adhered material with high-purity water for 5 times, then put the magnet into a 400mL beaker and add water until the magnet is completely covered. Place the beaker in an ultrasonic instrument for ultrasonic cleaning for 30 seconds, then remove the magnet, wash it with high-purity water three times, then wash it once with absolute ethanol, and dry it naturally;

[0047] C. Cut the conducti...

Embodiment 3

[0053] A. Weigh 200g of cobalt tetroxide, the precursor of lithium battery cathode material, and place it in a 500mL plastic test bottle, put it into a qualified clean magnet (with a magnetic field strength of 5000GS), fill it with high-purity water, shake it up and down for 10 times, and place the test bottle in a mixing chamber. In the homogenizer, mix clockwise and counterclockwise for 15 minutes at the speed of the mixer at 120r / min, then take it off;

[0054] B. After the mixing is completed, take off the test bottle, pour out the sample slurry in the test bottle, take out the magnet, rinse the adhered material with high-purity water for 3 times, then put the magnet into a 400mL beaker and add water until the magnet is completely covered. Place the beaker in an ultrasonic instrument for ultrasonic cleaning for 30 seconds, then remove the magnet, wash it with high-purity water three times, then wash it once with absolute ethanol, and dry it naturally;

[0055] C. Cut the c...

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Abstract

The invention discloses an SEM-EDS combined test method for metal foreign matters in a lithium battery material and belongs to the field of lithium ion battery materials. With the method adopted, theproblem of poor detection result accuracy of an existing SEM detection method can be solved. The method comprises the following steps that: high-purity water and a lithium ion positive electrode material are added into a test bottle, a magnet of which the magnetic field intensity ranges from 5000GS to 6000GS is put into the test bottle, and the high-purity water, the lithium ion positive electrodematerial and the magnet are uniformly mixed; a slurry is poured out, the magnet is taken out, a material adhered to the magnet is washed with the high-purity water, a beaker with the magnet arrangedtherein is subjected ultrasonic washing with an ultrasonic instrument, the magnet is taken out from the beaker, is washed and dried; a magnetic foreign matter on the magnet is adhered to a conductiveadhesive tape; and the form and particle size of the magnetic foreign matter particles are identified through an SEM, the chemical composition and type of the foreign matter particles are determined through energy spectrum analysis, and magnetic foreign matter content statistics is performed according to the determined type, quantity and particle size of the metal-containing foreign matter particles. With the method adopted, trace metal foreign matter particles can be accurately analyzed.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a SEM-EDS combined test method for metal foreign matter in lithium-ion battery materials. Background technique [0002] During the production process of lithium-ion battery cathode materials, it is inevitable to introduce some magnetic foreign matter containing metal impurities such as Fe, Cu, Cr, Ni, Zn, Ag, Pb, Sn to varying degrees. During the charge and discharge process, when the voltage reaches the redox potential of these elements, these metal foreign matter impurities will undergo a series of side reactions of positive electrode oxidation and negative electrode reduction between the positive and negative electrodes of the battery. When the reduced metal element at the negative electrode accumulates to a certain To a certain extent, the hard edges and corners of the deposited metal will pierce the diaphragm, causing the battery to self-discharge or ...

Claims

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Application Information

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IPC IPC(8): G01N23/2208G01N23/2202G01N23/22G01N15/02
CPCG01N15/02G01N23/22G01N23/2202G01N23/2208G01N2015/0294G01N2223/072G01N2223/1016G01N2223/652G01N2223/66
Inventor 智福鹏江名喜马骞祁世青刘吉地宋如梦王娟辉赵明理郭晶郝亚莉符建国赵芙蓉
Owner JINCHUAN GROUP LIMITED
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