Method of detecting dispersion stability of battery paste

A technology of dispersion stability and slurry, applied in the direction of flow characteristics, measuring device, particle size analysis, etc., can solve the problems of cumbersome process, irrecoverable damage of slurry, time-consuming, etc., and achieve improved uniformity, low cost, and time consumption. short effect

Active Publication Date: 2019-01-04
SHAANXI COAL & CHEM TECH INST
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Problems solved by technology

[0003] There are many methods for evaluating slurry stability at present. The method proposed by patent CN102539294A is to place the slurry in a separatory funnel, and then test the particle size difference of the upper and lower layers of the slurry in the separatory funnel to evaluate the slurry stability. This method time consuming
Patent CN101382489A evaluates the stability of the slurry by testing the difference in the backscattering intensity of the upper and lower layers of the slurry after centrifugation. Although this method is fast, the slurry needs to be centrifuged, and then a laser scattering instrument is used to measure the backscattering intensity. The process is cumbersome, and centrifugation will cause irreversible damage to the slurry

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  • Method of detecting dispersion stability of battery paste
  • Method of detecting dispersion stability of battery paste
  • Method of detecting dispersion stability of battery paste

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Effect test

Embodiment 1

[0032] According to the mass ratio of 96:2:1.5:0.5, weigh nickel-cobalt lithium manganese oxide, PVDF, SP, CNT, and NMP as the solvent, and the designed solid content is 68%. According to the process requirements, use a stirred tank to make slurry, and take 50mL of slurry Put the final positive electrode slurry into a 50mL graduated cylinder, then place the graduated cylinder containing the positive electrode slurry on a tap density meter to vibrate for 30min at a frequency of 300 times / min, with a vibration height of 5cm, and use a straw to suck up 1cm from the surface of the slurry. Use a scraper fineness meter to measure the fineness of the slurry at 0.5mL, repeat the suction and measurement operations, and measure three times to obtain the average value; Measure the fineness with a meter, repeat the suction and measurement operations, measure the average three times continuously, and calculate the fineness ratio of the upper layer slurry and the lower layer slurry. Test th...

Embodiment 2

[0034] According to the mass ratio of 95:3:1.5:0.5, weigh nickel-cobalt lithium manganese oxide, PVDF, SP, CNT, and NMP as the solvent, and the designed solid content is 68%. According to the process requirements, use a stirred tank to make slurry, and take 50mL of slurry Put the final positive electrode slurry into a 50mL graduated cylinder, then place the graduated cylinder containing the positive electrode slurry on a tap density meter to vibrate for 30min at a frequency of 300 times / min, with a vibration height of 1cm, and use a pipette gun to absorb the amount of slurry Slurry 0.2mL at 5cm from the surface, measure the fineness with a scraper fineness meter, repeat the suction and measurement operations, and measure three times to obtain the average value; The fineness meter measures the fineness, repeats the suction and measurement operations, and calculates the average value for three consecutive measurements, and calculates the fineness ratio of the upper layer slurry a...

Embodiment 3

[0036] According to the mass ratio of 97:1:1.5:0.5, weigh nickel-cobalt lithium manganese oxide, PVDF, SP, CNT, and NMP as the solvent, and the designed solid content is 68%. According to the process requirements, use a stirred tank to make slurry, and take 50mL of slurry Put the final positive electrode slurry into a 50mL graduated cylinder, then place the graduated cylinder containing the positive electrode slurry on a tap density meter to vibrate for 30min at a frequency of 300 times / min, with a vibration height of 5cm, and use a pipette to absorb the amount of the slurry Slurry 0.8mL at 8cm from the surface, measure the fineness with a scraper fineness meter, repeat the suction and measurement operations, and measure three times to get the average value; The fineness meter measures the fineness, repeats the suction and measurement operations, measures three times in total, calculates the average value, and calculates the fineness ratio of the upper layer slurry and the lowe...

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Abstract

The invention provides a method of detecting dispersion stability of battery paste. The method comprises the steps of 1, adding battery paste into a container; 2, vibrating the container with the batter paste on a vibrating device; 3, after vibrating, testing fineness for upper paste and lower paste, evaluating dispersion stability of the paste according a fineness ratio of the upper paste to thelower paste, confirming that the dispersion stability of the paste is excellent if the fineness ratio of the upper paste to the lower past is higher than 0.9, confirming that the dispersion stabilityof the paste is good if the fineness ratio of the upper paste to the lower paste is between 0.7 and 0.9, and confirming that the dispersion stability of the paste is poor if the fineness ratio of theupper paste to the lower paste is less than 0.7. The method is low in time consumption and cost, and no damage due to vibration is caused to the paste.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a method for detecting the dispersion stability of slurry for batteries. Background technique [0002] Lithium-ion batteries have become the main energy source for communication electronic products due to their advantages such as clean and environmentally friendly, high energy density, stable discharge voltage, and good cycle performance. In recent years, lithium-ion batteries are considered to be one of the most promising forms of new energy power, and scientists from various countries are constantly working on the development and research of more practical and effective lithium-ion batteries. Slurry is an important factor that determines the performance of lithium-ion batteries. Poor dispersion stability of slurry will lead to poor battery consistency, small reversible capacity, and may even cause potential safety hazards. Battery performance is critical. [0003] There a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00G01N15/02
CPCG01N11/00G01N15/02
Inventor 袁丽只邵乐胡朝文冯皓郑勇田占元
Owner SHAANXI COAL & CHEM TECH INST
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