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Test method for characterizing dispersion state of conductive slurry of lithium battery

A technology of conductive paste and dispersion state, which is applied in the preparation of test samples, material analysis through optical means, and measurement devices, etc., which can solve the problems of easy depth of field, easy generation of air bubbles in tablet pressing, and uneven pressing force. Achieve the effect of easy image digital processing, convenient statistical analysis, and accurate detection results

Pending Publication Date: 2022-04-12
沈阳汇晶纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) The solvent in the sample by the direct compression method will flow in an irregular direction, and the distribution of carbon tubes at a fixed position cannot be observed;
[0008] (2) Compression is easy to produce air bubbles, which is not conducive to observation;
[0009] (3) It is difficult to judge the dispersion state of carbon nanotubes by tableting method;
[0010] (4) Uneven force in pressing the tablet, easy to produce depth of field;
[0011] In summary, the two methods of optical density and direct compression microscope observation are not conducive to characterizing the dispersion state of single-walled carbon nanotube conductive paste

Method used

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  • Test method for characterizing dispersion state of conductive slurry of lithium battery
  • Test method for characterizing dispersion state of conductive slurry of lithium battery
  • Test method for characterizing dispersion state of conductive slurry of lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A method for testing the dispersion state of single-walled carbon nanotube conductive paste, comprising the following steps:

[0058] Step 1, paste preparation:

[0059] Dissolve CMC (sodium carboxymethylcellulose) in water, and adjust the viscosity by continuously adding CMC. After stirring evenly, the CMC aqueous solution is in a semi-solid state, and there is no glue block. The viscosity is in the range of 50000mPa·s, and the paste A is obtained;

[0060] Step 2, Dilution:

[0061] Weigh 1g of single-walled carbon nanotube conductive paste and place it in a 100ml PE bottle, dilute the CNT to 0.02wt% according to the CNT ratio of the slurry, the diluted solution weighs 40g, shake with an amplitude of 30cm, and shake for 5min until uniform. Obtain diluted slurry B;

[0062] Step 3, mix:

[0063] Weigh the paste A and the diluted slurry B in a mass ratio of 1:1, place them in an agate mortar, stir with a pestle, and reconcile until the solution is fine and free of co...

Embodiment 2

[0074] A method for testing the dispersion state of single-walled carbon nanotube conductive paste, comprising the following steps:

[0075] Step 1, paste preparation:

[0076] Dissolve CMC (sodium carboxymethyl cellulose) in water, adjust the viscosity by continuously adding CMC, after stirring evenly, the CMC aqueous solution is in a semi-solid state, and there is no glue block, the viscosity is in the range of 60000mPa·s, and the paste A is obtained;

[0077] Step 2, Dilution:

[0078] Weigh 2g of single-walled carbon nanotube conductive paste and place it in a 100ml PE bottle. Dilute the CNT to 0.02wt% according to the CNT ratio of the slurry. The weight of the diluted solution is 50g. Obtain diluted slurry B;

[0079] Step 3, mix:

[0080] Weigh the paste A and the diluted slurry B in a mass ratio of 1:1.1, place them in an agate mortar, stir with a pestle, and reconcile until the solution is fine and free of colloidal particles, and a mixed slurry C is obtained;

[0...

Embodiment 3

[0091] A method for testing the dispersion state of single-walled carbon nanotube conductive paste, comprising the following steps:

[0092] Step 1, paste preparation:

[0093] Dissolve CMC (sodium carboxymethyl cellulose) in water, adjust the viscosity by continuously adding CMC, after stirring evenly, the CMC aqueous solution is in a semi-solid state, and there is no glue block, the viscosity is in the range of 70000mPa·s, and the paste A is obtained;

[0094] Step 2, Dilution:

[0095] Weigh 1.5g of single-walled carbon nanotube conductive paste and place it in a 100ml PE bottle. Dilute the CNT to 0.03wt% according to the CNT ratio of the slurry. The weight of the diluted solution is 48g. , to obtain diluted slurry B;

[0096] Step 3, mix:

[0097] Weigh the paste A and the diluted slurry B in a mass ratio of 1:1.2, place them in an agate mortar, stir with a pestle, and reconcile until the solution is fine and free of colloidal particles, and a mixed slurry C is obtained...

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Abstract

A test method for characterizing the dispersion state of conductive paste of a lithium battery belongs to the technical field of lithium ion batteries, and comprises the steps of paste preparation, dilution, mixing, optical microscope observation, characterization of gray value distribution of a gray-scale map and the like. According to the method disclosed by the invention, the solid sample glass slide is prepared in a special dilution mode, and the dispersion state of the single-walled carbon nanotubes is represented by combining a counting method and a gray value distribution comprehensive index, so that a detection result is accurate and effective, a safe and reliable basis is better provided for subsequent lithium ion battery manufacturing, and the battery product quality is ensured; besides, the method adopts a dispersing step, designs a special glass slide, and is provided with a groove, so that the slurry can be placed in the groove, the state is stable, the slurry does not flow, the slurry is not pressed to be dispersed, the observation state is more accurate, and the accuracy of a detection result is improved by more than 50%.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a test method for characterizing the dispersion state of lithium battery conductive paste. Background technique [0002] Single-walled carbon nanotubes are one-dimensional conductive materials with high specific surface area and high aspect ratio, which have excellent mechanical properties, as well as good electrical and thermal conductivity. Based on the material characteristics of greater aspect ratio, single-walled carbon nanotubes form a dense 3D conductive network in high-energy-density lithium battery applications, forming a conductive network for lithium ions and electrons, reducing battery internal resistance, and improving battery safety. , to achieve faster charging speed. [0003] Conductive agents are crucial components in lithium batteries. In the process of battery production, the conductive paste will be mixed with the positive and negat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84G01N1/28G01N1/38
Inventor 李洋冯立君张学顺李彪董浩男
Owner 沈阳汇晶纳米科技有限公司