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A slurrying method of a mixed cathode material

A technology of mixing positive electrode materials and pulping, which is applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problem of not meeting the requirements of battery energy density and cycle life, affecting the uniformity of the active material layer, and affecting the performance of the positive electrode of the coating process and other problems, to achieve the effect of avoiding slurry settlement, avoiding settlement, good dispersion and stability

Active Publication Date: 2019-01-01
江门市力源电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of electric vehicles, the positive electrode composed of a single active material can no longer meet the energy density and cycle life requirements of electric vehicles for batteries. The battery with mixed positive electrode materials has become the focus of research and development. The dispersion and stability of mixed positive electrode materials It directly affects the uniformity of the active material layer on the surface of the pole piece, thus affecting the coating process and the performance of the positive electrode

Method used

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Embodiment 1

[0025] 1), providing lithium iron phosphate with a first particle size, the first particle size is 50nm; mixing lithium iron phosphate and Super P according to a mass ratio of 100:5, and ball milling for 6 hours; the ball-to-material ratio of ball milling is 4:1 , the rotating speed of the ball mill is 150r / min;

[0026] 2), add the solvent into the first stirred tank, keep the temperature in the stirred tank at 45°C, add carboxymethyl cellulose sodium into the first stirred tank, stir for 5h, then add carboxymethyl cellulose Sodium, stir for 2h, add the product of step 1, stir for 2h, then vacuumize and stir for 4h to obtain the first slurry, wherein the mass ratio, the lithium iron phosphate: Super P: PVDF: sodium carboxymethylcellulose=100: 5:5:4;

[0027] 3) Provide lithium cobaltate with a second particle size of 0.5 μm; add the solvent to the second stirred tank, keep the temperature in the stirred tank at 30°C, and add PVDF to the second stirred tank In the second sti...

Embodiment 2

[0031] 1), providing lithium iron phosphate with a first particle size, the first particle size being 150nm; mixing lithium iron phosphate and Super P according to a mass ratio of 100:3, and ball milling for 4 hours; the ball-to-material ratio of ball milling is 3:1 , the rotating speed of the ball mill is 100r / min;

[0032] 2) Add the solvent into the first stirred tank, keep the temperature in the stirred tank at 35°C, add carboxymethyl cellulose sodium into the first stirred tank, stir for 3 hours, then add carboxymethyl cellulose Sodium, stir for 1h, add the product of step 1, stir for 1h, then vacuumize and stir for 3h to obtain the first slurry, wherein the mass ratio, the lithium iron phosphate: Super P: PVDF: sodium carboxymethylcellulose=100: 3:3:2;

[0033] 3) Provide lithium cobaltate with a second particle size of 2 μm; add the solvent to the second stirred tank, keep the temperature in the stirred tank at 20°C, and add PVDF to the second stirred tank In the stir...

Embodiment 3

[0037] 1), providing lithium iron phosphate with a first particle size, the first particle size is 100nm; mixing lithium iron phosphate and Super P according to a mass ratio of 100:4, and ball milling for 5 hours; the ball-to-material ratio of ball milling is 4:1 , the rotating speed of the ball mill is 120r / min;

[0038]2) Add the solvent into the first stirred tank, keep the temperature in the stirred tank at 40°C, add sodium carboxymethyl cellulose into the first stirred tank, stir for 4 hours, then add carboxymethyl cellulose Sodium, stir for 2h, add the product of step 1, stir for 2h, then vacuumize and stir for 3h to obtain the first slurry, wherein the mass ratio, the lithium iron phosphate: Super P: PVDF: sodium carboxymethylcellulose=100: 4:4:3;

[0039] 3) Provide lithium cobalt oxide with a second particle size, the second particle size is 1 μm; add the solvent into the second stirred tank, keep the temperature in the stirred tank at 25°C, and add PVDF into the sec...

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Abstract

The present invention provides a slurrying method of a mixed cathode material, the mixed cathode material comprises a first active material having a first particle size, a second active material having a second particle size, and a third active material having a third particle size. The dispersity of different active materials is improved by slurrying different active materials under different conditions, and then the three kinds of slurry is mixed to obtain the slurry with high dispersity and stable performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a pulping method for mixing positive electrode materials. Background technique [0002] With the development of electric vehicles, the positive electrode composed of a single active material can no longer meet the energy density and cycle life requirements of electric vehicles for batteries. The battery with mixed positive electrode materials has become the focus of research and development. The dispersion and stability of mixed positive electrode materials It directly affects the uniformity of the active material layer on the surface of the pole piece, thereby affecting the coating process and the performance of the positive electrode. Contents of the invention [0003] The present invention provides a slurrying method of a mixed positive electrode material, the mixed positive electrode material comprising a first active material with a first particle size, a sec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/1391H01M4/62
CPCH01M4/139H01M4/1391H01M4/625Y02E60/10
Inventor 邓丽萍
Owner 江门市力源电子有限公司
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