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Lithium ion battery positive electrode slurry and preparation method thereof

A lithium-ion battery, cathode slurry technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of easy agglomeration of conductive agent particles, poor slurry dispersion effect, and difficulty in dispersion.

Inactive Publication Date: 2021-05-11
深圳好电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above technical solution, the inventor believes that the particles of the conductive agent in the preparation of the positive electrode slurry are easy to agglomerate and difficult to disperse, resulting in poor dispersion effect of the slurry

Method used

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  • Lithium ion battery positive electrode slurry and preparation method thereof
  • Lithium ion battery positive electrode slurry and preparation method thereof
  • Lithium ion battery positive electrode slurry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] S1. Weigh 968.3g LiNi 0.5 mn 0.3 co 0.2 o 2 , 15g conductive carbon black, 5g conductive graphite, 11.2g polyvinylidene fluoride (binder A) and 0.5g binder B, 15g conductive carbon black, 5g conductive graphite, 11.2g binder A and 0.5g Binder B is added to the double planetary mixer, and 130g of N-methylpyrrolidone (NMP) is added to mix well, set the revolution speed to 20r / min, keep it for 10min, start the rotation, the speed is 2500r / min, vacuumize to vacuum degree -0.085MPa , the stirring time is 60min;

[0069] S2, add 484.2g LiNi in the product of above-mentioned step S1 0.5 mn 0.3 co 0.2 o 2 , set the revolution speed of the double planetary mixer to 25r / min, after stirring for 20min, start the rotation of the double planetary mixer and set the rotation speed to 3000r / min, vacuumize to -0.085MPa, and stir for 60min;

[0070] S3, add 484.1g LiNi in three times to the product of the above step S2 0.5 mn 0.3 co 0.2 o 2 , set the revolution speed of the do...

Embodiment 2

[0073] S1. Add 15g conductive carbon black, 5g conductive graphite, 11.2g binder A and 0.5g binder B into the double planetary mixer, and add 130g NMP, mix well, set the revolution speed to 18r / min, keep it for 10min and then start Autorotation, rotation speed 2000r / min, vacuumize to vacuum degree -0.08MPa, time 60min; S2, add 484.2g lithium cobaltate to the product of the above step S1, set the double planetary mixer revolution speed 25r / min, after stirring for 10min, Start and set the rotation speed of the double planetary mixer to 2500r / min, vacuumize to -0.08MPa, and stir for 60min;

[0074] S3. Add 484.1g of lithium cobaltate three times to the product of the above step S2, set the revolution speed of the double planetary mixer to 25r / min, after stirring for 10min, start and set the rotation speed of the double planetary mixer to 2500r / min, and evacuate to a vacuum Degree -0.08MPa, stirring time 60min;

[0075] S4, add 260gNMP to the product of the above step S2, adjust ...

Embodiment 3

[0077] S1. Add 15g of conductive carbon black, 10g of conductive graphite, 11.2g of binder A and 0.8g of binder B into the double planetary mixer, and add 140g of NMP to mix thoroughly, set the revolution speed to 15r / min, keep it for 20min and then start the rotation , the speed is 2500r / min, the vacuum is vacuumed to -0.1MPa, and the time is 60min;

[0078] S2. Add 482g of lithium iron phosphate to the product of the above step S1, set the revolution speed of the double planetary mixer to 20r / min, after stirring for 20min, start and set the rotation speed of the double planetary mixer to 3000r / min, and evacuate to a vacuum degree of -0.1 MPa, stirring time 60min;

[0079] S3. Add 481g of lithium iron phosphate three times to the product of the above step S2, set the revolution speed of the double planetary mixer to 20r / min, after stirring for 20min, start and set the rotation speed of the double planetary mixer to 3000r / min, and evacuate to a vacuum degree -0.1MPa, stirring...

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Abstract

The invention discloses a lithium ion battery positive electrode slurry. The positive electrode slurry comprises, by weight, 93.5-97.95% of a positive electrode active material, 1-3% of a conductive agent, 1-3% of a binder A, and 0.05-0.5% of a binder B. The binder A is one of polyvinylidene fluoride or polytetrafluoroethylene, and the viscosity of the binder B is 500 to 2500 mPas; and the positive electrode slurry further comprises a solvent, the positive electrode active material, the conductive agent, the binder A and the binder B are uniformly mixed by the solvent, the solid content of the obtained positive electrode slurry is 70-75%, and the viscosity of the obtained positive electrode slurry is 6000-15000 mPa.s. According to the invention, the dispersion uniformity of the conductive agent can be improved, the stability of the viscosity of the positive electrode slurry can be improved, and the processing efficiency of the positive plate can be improved.

Description

technical field [0001] The present application relates to the technical field of lithium ion batteries, more specifically, it relates to a positive electrode slurry for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, stable working voltage, no memory effect, good safety performance and low cost, and have broad application prospects in new energy sources. With the promotion and rapid development of the application field of lithium-ion batteries, higher requirements are put forward for the performance of lithium-ion batteries, not only requiring lithium-ion batteries to have a higher capacity, but also requiring excellent The remaining capacity retention rate is high, showing excellent cycle performance and achieving the effect of long-life use. [0003] The positive electrode slurry system for lithium ion batteries includes active materials, binders, conductive agents and ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M4/5825H01M4/621H01M4/623H01M4/624H01M10/0525Y02E60/10
Inventor 曹华伟李涛张紫方陶晶
Owner 深圳好电科技有限公司
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