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Evaluation method for lithium ion battery anode paste stability

A lithium-ion battery and positive electrode slurry technology, applied in flow characteristics, analysis materials, measurement devices, etc., can solve the problems of different, repeatability and accuracy of test results, etc., to achieve strong practicability, simple and fast operation steps, good reproducibility

Inactive Publication Date: 2015-09-02
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is convenient, it also has its limitations. First, there is no selection standard for centrifugation speed and centrifugation time, because different slurries have different viscosities and require different centrifugation conditions; The intensity difference is also different, the repeatability and accuracy of the test results are not high

Method used

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  • Evaluation method for lithium ion battery anode paste stability
  • Evaluation method for lithium ion battery anode paste stability
  • Evaluation method for lithium ion battery anode paste stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh lithium iron phosphate, SP, KS-6 and PVDF, the mass percentage is 90:4:1:5, use NMP as the dispersing solvent, the theoretical solid content is set to 45%, and use XFZH planetary dispersion stirring vacuum according to the process requirements The mixer disperses and stirs at high speed for 2 hours. Take 100 ml of the mixed positive electrode slurry and fill it into a 50 ml acid burette. The upper opening is tightly sealed with a sealing plug and placed vertically at room temperature. After standing for 1 hour, use a rubber-tip dropper. The slurry at the upper end is sucked out, and the slurry at the lower end is discharged through the rotating glass piston, and the solid content and the shear rate-viscosity curve of the slurry are measured.

[0020] figure 1 It is a graph of the shear rate-viscosity change curve of the positive electrode slurry in Example 1 after standing for 1 hour, where a1 and a2 are the shear rate-viscosity change curve of the slurry at the uppe...

Embodiment 2

[0022] Weigh lithium iron phosphate, SP, KS-6 and PVDF, the mass percentage is 90:4:1:5, use NMP as the dispersing solvent, the theoretical solid content is set to 45%, and use XFZH planetary dispersion stirring vacuum according to the process requirements The mixer disperses and stirs at high speed for 4 hours. Take 100 ml of the mixed positive electrode slurry and fill it into a 50 ml acid burette. The upper opening is tightly sealed with a sealing plug and placed at room temperature to stand vertically. After standing for 3 hours, use a rubber-tip dropper. The slurry at the upper end is sucked out, and the slurry at the lower end is discharged through the rotating glass piston, and the solid content and the shear rate-viscosity curve of the slurry are measured.

[0023] figure 2 It is the shear rate-viscosity change curve of the positive electrode slurry in Example 2 after standing for 3 hours, where b1 and b2 are the shear rate-viscosity change curve of the slurry at the upp...

Embodiment 3

[0025] Weigh lithium iron phosphate, SP, KS-6 and PVDF, the mass percentage is 90:4:1:5, use NMP as the dispersing solvent, the theoretical solid content is set to 45%, and use XFZH planetary dispersion stirring vacuum according to the process requirements The mixer stirs at high speed for 6 hours. Take 100 ml of the mixed positive electrode slurry and fill it into a 50 ml acid burette. The upper opening is tightly sealed with a sealing plug and placed in a vertical stand at room temperature. After standing for 5 hours, use the glue head to drip. The pipe sucks out the slurry at the upper end, and discharges the slurry at the lower end through the rotating glass piston, and measures the solid content and shear rate-viscosity curve of the slurry.

[0026] image 3 It is the shear rate-viscosity change curve of the positive electrode slurry in Example 3 after standing for 5 hours, where c1 and c2 are the shear rate-viscosity change curve of the slurry at the upper and lower ends of...

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Abstract

The invention discloses an evaluation method for lithium ion battery anode paste stability. An acid type burette is filled with anode paste, after vertical standing is carried out for 1-5 hours, the paste is measured from the upper end part and the lower end part of the burette respectively, a shear rate-viscosity curve of the paste is measured by using a rheometer, when the coincidence of the shear rate-viscosity curves of the paste on the upper end part and the lower end part is good, the paste stability is shown to be good, otherwise, the paste stability is shown to be poor. According to the evaluation method disclosed by the invention, operation steps are simple and quick, the practicability is high, test results are accurate, the reproducibility is good, and accurate reference can be provided for the evaluation of the paste stability.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery manufacturing, in particular to a method for evaluating the stability of a positive electrode slurry of a lithium ion battery. Background technique [0002] With the depletion of traditional energy sources and the increasingly prominent environmental problems, the development direction of lithium-ion batteries as a new type of clean energy has attracted more and more attention from governments and scientists, and they are constantly committed to the development and research of more practical and efficient lithium-ion batteries. Positive electrode slurry is an important factor that determines the performance of lithium-ion batteries. It is usually a liquid phase dispersion system formed by dispersing active materials, binders, and conductive agents in a solvent after being stirred evenly. However, the dispersibility of current practical active materials such as lithium iron phosphate in...

Claims

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Application Information

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IPC IPC(8): G01N11/00
Inventor 梁大宇
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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