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Method for testing stability of cathode slurry and preparation method of cathode slurry

A negative electrode slurry and testing method technology, applied in the preparation of test samples, measuring devices, particle size analysis, etc., can solve problems that are not conducive to the stability of the slurry, and achieve the effects of strong practicability, accurate results, and simple steps

Inactive Publication Date: 2012-07-04
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of these two factors will not be conducive to accurately judging the stability of the slurry

Method used

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  • Method for testing stability of cathode slurry and preparation method of cathode slurry
  • Method for testing stability of cathode slurry and preparation method of cathode slurry
  • Method for testing stability of cathode slurry and preparation method of cathode slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take graphite I (D50:20um), CMC, SBR, Sp, oxalic acid and deionized water. According to mass percentage: 160:4:4:3:400, use XFZH planetary dispersion stirring vacuum mixer to stir for 10 hours. A negative electrode slurry with uniform dispersion and good stability is obtained. Take 200ml of this negative electrode slurry and place it in a colorless and transparent glass separatory funnel. Measure the particle size distribution of the upper and lower slurry particles when the slurry is placed for 0h, 2h, 4h, 6h, 8h, 10h, 12h, 16h, 20h, 24h, and calculate the particle size ratio of the upper and lower layers, and draw the upper and lower layers The relationship between particle size ratio and time is a1. When testing, take the slurry 1cm away from the surface and bottom of the suspension for testing.

[0024] The laser particle size analyzer can use the Malvern MS2000 laser particle size analyzer. The stability of the slurry is judged by the change in the particle size r...

Embodiment 2

[0035] Take graphite II (D50:50um), CMC, SBR, Sp, oxalic acid and deionized water. According to mass percentage: 160:4:4:3:400, use XFZH planetary dispersion stirring vacuum mixer to stir for 10h. A negative electrode slurry with uniform dispersion and good stability is obtained. Take 200ml of this negative electrode slurry and place it in a colorless and transparent glass separatory funnel. Measure the particle size distribution of the upper and lower slurry particles when the slurry is placed for 0h, 2h, 4h, 6h, 8h, 10h, 12h, 16h, 20h, 24h, and calculate the particle size ratio of the upper and lower layers, and draw the upper and lower layers The relationship between particle size ratio and time is a2. When testing, take the slurry 1cm away from the surface and bottom of the suspension for testing.

Embodiment 3

[0037] Take graphite III (D50:15um), CMC, SBR, Sp, oxalic acid and deionized water. According to mass percentage: 160:4:4:3:400, use XFZH planetary dispersion stirring vacuum mixer to stir for 10h. A negative electrode slurry with uniform dispersion and good stability is obtained. Take 200ml of this negative electrode slurry and place it in a colorless and transparent glass separatory funnel. Measure the particle size distribution of the upper and lower slurry particles when the slurry is placed for 0h, 2h, 4h, 6h, 8h, 10h, 12h, 16h, 20h, 24h, and calculate the particle size ratio of the upper and lower layers, and draw the upper and lower layers The relationship between particle size ratio and time is a3. When testing, take the slurry 1cm away from the surface and bottom of the suspension for testing.

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Abstract

The invention discloses a method for testing the stability of a cathode slurry, which comprises the following steps: containing the cathode slurry in a separating funnel and standing for 2-4h; respectively weighing the cathode slurry from upper and lower layers of the separating funnel and carrying out ultrasonic dispersion on the cathode slurry for 28-32s; and testing the particle size of the cathode slurry particles by using a laser particle size analyser, obtaining a result that the cathode slurry has poor stability when the ratio of the particle size of the cathode slurry particles on the upper and lower layers is less than 0.9000 by measurement, and obtaining a result that the cathode slurry has good stability when the ratio of the particle size of the cathode slurry particles on the upper and lower layers is not less than 0.95 by measurement. The method for testing the stability of the cathode slurry is simple in steps, rapid, strong in practicality and accurate in result, and can provide an accurate reference for the next production.

Description

Technical field [0001] The present invention relates to the manufacturing technology of lithium ion batteries, specifically a test method for the stability of negative electrode slurry. Background technique [0002] Lithium ion secondary batteries have high specific energy (100~130Wh·kg -1 ), high voltage (3.6V single battery), small size, light weight, and good safety. It has achieved tremendous development in the past ten years and has become one of the main energy sources for communication electronic products. In recent years, new energy vehicles with new energy power as the core have attracted much attention. Among the various new energy power forms, lithium-ion batteries are considered to be one of the most promising new energy power forms. However, lithium-ion battery packs must have good consistency when used in new energy vehicles. In the battery manufacturing process, the consistency of the paste is one of the key factors affecting the consistency of the battery pack. ...

Claims

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Application Information

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IPC IPC(8): G01N15/02G01N1/38
Inventor 谢媛媛宫璐宋金保
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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