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Pulping method of positive electrode material with high specific surface area

A technology with high specific surface area and positive electrode material, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of agglomerated particles, low solid content, and inability to disperse positive electrode materials with high specific surface area, and achieve the effect of reducing costs

Active Publication Date: 2021-06-29
河北九丛科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention proposes a pulping method for high specific surface area positive electrode materials, which solves the problems in the prior art that the high specific surface area positive electrode materials cannot be dispersed, are jelly-like, have low solid content, and agglomerate particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Taking three-roll grinding pulping as an example, the following operations are performed:

[0033] Weigh 472.5g, 15g, and 12.5g of the dried lithium iron phosphate spherical material, Super-P, and PVDF respectively into the pulping tank, stir at a low speed of 200rpm for 10min to carry out dry mixing of the materials, and then stir at 400rpm for 20min to make them evenly mixed;

[0034] Add 125g NMP with high solid content and knead for 1h, adjust the speed to 300rpm, use strong shear force to make the agglomerate immersed in NMP, gradually add 375g NMP to 50% solid content, adjust the speed to 600rpm and continue stirring for 3h, add 0.25g oxalic acid, 0.25g KD-1, 0.25g silane coupling agent, keep stirring for 30min, and gradually add NMP until the viscosity is 9106mPa·s. Among them, KD-1 was purchased from Croda Company in the United Kingdom.

[0035] Adjust the roll gap at the feed inlet of the three-roll mill to 20 μm, and the gap at the discharge port to 16 μm. Th...

Embodiment 2

[0037] Weigh 472.5g, 15g, and 12.5g of the dried lithium iron phosphate spherical material, Super-P, and PVDF respectively into the pulping tank, stir at a low speed of 200rpm for 10min to carry out dry mixing of the materials, and then stir at 400rpm for 20min to make them evenly mixed;

[0038] Add 125g of NMP with high solid content and knead for 1h, adjust the speed to 300rpm, use strong shear force to make the agglomerate immersed in NMP, gradually add 375g of NMP to 50% solid content, adjust the speed to 600rpm and continue stirring for 3h, add 0.25g of isopropanol, 0.3g of polyethylene glycol and 0.25g of silane coupling agent were continuously stirred for 30min, and NMP was gradually added until the viscosity was 9826mPa·s.

[0039] Adjust the roll gap at the feed inlet of the three-roll mill to 20 μm, and the gap at the discharge port to 16 μm. The slurry is poured into the discharge port from the feed port and taken out. After the first grinding, adjust the gap of the d...

Embodiment 3

[0041] Weigh 472.5g, 15g, and 12.5g of the dried lithium iron phosphate spherical material, Super-P, and PVDF respectively into the pulping tank, stir at a low speed of 200rpm for 10min to carry out dry mixing of the materials, and then stir at 400rpm for 20min to make them evenly mixed;

[0042] Add 125g of NMP with high solid content and knead for 1h, adjust the speed to 300rpm, use strong shear force to make the agglomerate immersed in NMP, gradually add 375g of NMP to 50% solid content, adjust the speed to 600rpm and continue stirring for 3h, add 0.25g of isopropanol, 0.3g PVP and 0.25g silane coupling agent were continuously stirred for 30min, and NMP was gradually added until the viscosity was 96510mPa·s.

[0043] Adjust the roll gap at the feed inlet of the three-roll mill to 20 μm, and the gap at the discharge port to 16 μm. The slurry is poured into the discharge port from the feed port and taken out. After the first grinding, adjust the gap of the discharge port to 8 ...

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PUM

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Abstract

The invention relates to the technical field of lithium ion battery processing, and provides a pulping method of a positive electrode material with high specific surface area. The pulping method comprises the following steps of: S1, adding the dried positive electrode material with high specific surface area, conductive carbon black and polyvinylidene fluoride into a pulping tank, and uniformly stirring and mixing the mixture; S2, adding N-methyl pyrrolidone into the mixture according to the solid content of 70%-90%, stirring or kneading the product at a low speed under the high solid content, then gradually adding N-methyl pyrrolidone the solid content is 40%-50%, stirring continuously, then adding a surfactant, a modifier and a silane coupling agent, stirring the mixture, and gradually adding N-methyl pyrrolidone till the viscosity is 8000-10000 mPa.s; and S3, taking the slurry obtained in the step S2, carrying out high-strength mechanical dispersion, and stirring the slurry. According to the pulping method, the problems that a positive electrode material cannot be dispersed, is jelly-shaped, is low in solid content and agglomerates particles in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery processing, in particular to a pulping method for a positive electrode material with a high specific surface area. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries, which have many advantages such as high voltage, high energy density, good cycle performance, small self-discharge, and wide operating temperature range. They are widely used in telephones, notebook computers, power tools, etc. It also has a good application prospect, and the positive electrode material of the phosphate series has become the best alternative power source for new energy vehicles and large-scale energy storage power stations due to its good safety and excellent cycle performance. [0003] Taking the lithium iron phosphate cathode material as an example, most of the currently synthesized lithium iron phosphate is formed by sintering the precursor after spr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 张克强杨亚勇邢子傲
Owner 河北九丛科技有限公司
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