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Preparation method of lithium ion battery cathode slurry

A lithium-ion battery, cathode slurry technology, applied in electrode manufacturing, secondary batteries, circuits, etc., can solve the problems of high price of N-methylpyrrolidone, poor slurry dispersibility, and high overall cost, and shorten the drying time. Time, low cost, and the effect of reducing dosage

Inactive Publication Date: 2019-11-19
大连恒超锂业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because polyvinylidene fluoride was not dissolved in advance, the dispersion of the slurry is not good, and the organic solvent N-methylpyrrolidone is expensive and toxic, and has the disadvantages of high overall cost and unfriendly environment

Method used

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  • Preparation method of lithium ion battery cathode slurry
  • Preparation method of lithium ion battery cathode slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Pack the conductive agent, polyvinylidene fluoride and active material in a watch glass respectively, dry in an oven at 120°C for 4 hours, and then cool down;

[0024] (2) Put 5kg of active material (lithium iron phosphate material) and 0.25kg of conductive agent (conductive carbon black) into a 10L mixing tank, stir slowly for 30min without vacuum, revolution at 10 rpm, and autorotation at 300 rpm;

[0025] (3) After mixing evenly, add 2L of absolute ethanol, keep the stirring speed unchanged, and continue to stir for 15 minutes. After the powder is completely infiltrated, add 3L of N-methylpyrrolidone solution, revolution 10 rpm, and autorotation 300 rpm. Stir for 15 minutes; after stirring evenly, vacuumize to -99Kpa; the N-methylpyrrolidone solution is prepared by dissolving 0.25kg polyvinylidene fluoride in 3LN-methylpyrrolidone;

[0026] (4) Adjust the slurry viscosity to 2500mpa·s.

Embodiment 2

[0028] (1) Pack the conductive agent, polyvinylidene fluoride and active material in a watch glass respectively, dry in an oven at 120°C for 4 hours, and then cool down;

[0029] (2) Put 5kg of active material (lithium cobaltate) and 0.05kg of conductive agent (carbon nanotube) into a 10L stirring tank, stir slowly for 120min without vacuum, revolution at 30rpm, and autorotation at 1000rpm;

[0030] (3) After mixing evenly, add 1L of absolute ethanol, keep the stirring speed unchanged, and continue to stir for 60 minutes. After the powder is completely infiltrated, add 4L of N-methylpyrrolidone solution, revolution at 30 rpm, and autorotation at 1000 rpm. Stir for 60 minutes; after stirring evenly, vacuumize to -90Kpa; the N-methylpyrrolidone solution is prepared by dissolving 0.5kg polyvinylidene fluoride in 4LN-methylpyrrolidone;

[0031] (4) Adjust the slurry viscosity to 5000mpa·s.

Embodiment 3

[0033] (1) Pack the conductive agent, polyvinylidene fluoride and active material in a watch glass respectively, dry in an oven at 120°C for 4 hours, and then cool down;

[0034] (2) Put 5kg of active material (nickel cobalt lithium manganese oxide) and 0.25kg of conductive agent (a mixture of graphene and carbon nanotubes) into a 10L stirring tank, stir slowly for 100min without vacuum, and rotate at 20 rpm, Rotation 500 rpm;

[0035] (3) After mixing evenly, add 4L of absolute ethanol, keep the stirring speed unchanged, and continue to stir for 30 minutes. After the powder is completely infiltrated, add 1L of N-methylpyrrolidone solution, revolution at 20 rpm, and autorotation at 500 rpm. Stir for 450min; after stirring evenly, vacuumize to -90Kpa; the N-methylpyrrolidone solution is prepared by dissolving 0.05kg of polyvinylidene fluoride in 1L of N-methylpyrrolidone;

[0036] (4) Adjust the slurry viscosity to 5000mpa·s.

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Abstract

The invention relates to a preparation method of lithium ion battery cathode slurry, and belongs to the technical field of lithium ion battery slurry. According to the main technical scheme, the preparation method comprises the following steps of: (1) adding 1-10 parts of a conductive agent and 100 parts of an active substance into a stirring tank for uniform stirring; (2) adding 20-80 parts of absolute ethyl alcohol into the stirring tank, and performing stirring until the absolute ethyl alcohol is completely infiltrated; (3) adding 20-80 parts of an N-methyl pyrrolidone solution into the stirring tank for uniform stirring; and (4) adjusting the viscosity. According to the preparation method, the conductive agent and the active substance powder are premixed, then the absolute ethyl alcohol is added for dispersion, then the dissolved polyvinylidene fluoride solution is added, and the obtained slurry is good in dispersion effect; and compared with a traditional process, absolute ethyl alcohol and N-methyl pyrrolidone are used as solvents, the use amount of the N-methyl pyrrolidone is reduced, the cost is saved, the emission of harmful substances is reduced, and the method has important significance in environmental protection.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery slurry, and in particular relates to a preparation method of lithium ion battery positive electrode slurry. Background technique [0002] At present, when making lithium-ion batteries, the positive electrode slurry stirring process is usually to dissolve polyvinylidene fluoride in an organic solvent, then add a conductive agent for stirring, and finally add an active material and stir evenly, and the material can be discharged after the viscosity is adjusted. Patent No. 201310212910.1 invented a method for preparing positive electrode slurry. The method includes: 1) putting powdery conductive agent, active material and polymer polyvinylidene fluoride into a stirring tank for stirring, 2) adding N-formazan The base pyrrolidone continues to stir, and after being completely infiltrated, vacuumizes and continues to stir. 3) Use an organic solvent to adjust the viscosity of the slurry, cont...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0525H01M4/04
CPCH01M10/0569H01M10/0525H01M4/04Y02E60/10
Inventor 于彩红邹毅张涛黄强邹楠王雪高嵩
Owner 大连恒超锂业科技有限公司
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