Positive paste containing carbon nanotube and preparation method and application thereof

A positive electrode slurry and carbon nanotube technology, which is applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of active material slurry agglomeration and uneven dispersion, and achieve the effect of improving dispersion performance

Active Publication Date: 2017-06-20
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The positive electrode slurry prepared by the method of the present invention is uniform and stable, and the carbon nanotubes therein are uniformly dispersed, which solves the agglomeration of the active material slurry caused by the synergistic effect of the carbon nanotube material and polyvinylidene fluoride glue in the prior art , the problem of uneven dispersion

Method used

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  • Positive paste containing carbon nanotube and preparation method and application thereof
  • Positive paste containing carbon nanotube and preparation method and application thereof
  • Positive paste containing carbon nanotube and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A method for preparing a uniformly dispersed positive electrode slurry containing carbon nanotubes, comprising the steps of:

[0058] S1. Mix polyvinylidene fluoride resin and N-methylpyrrolidone at a mass ratio of 8:92, stir and disperse to make polyvinylidene fluoride glue; the steps of stirring and dispersing are: first stir at a revolution rate of 10rpm for 3min and then stir for 120min at a rate of 25rpm revolution and 2000rpm dispersion stirring (ie rotation) to achieve the effect of stirring and dispersing.

[0059] S2. According to the mass ratio of the positive active material lithium iron phosphate and N-methylpyrrolidone is 2:1, add the positive active material into N-methylpyrrolidone for infiltration, stir and disperse to obtain the positive active material infiltration solution; stir and disperse The steps are as follows: first stir at a speed of 10 rpm for 3 minutes; then stir for 60 minutes at a speed of 25 rpm and 2000 rpm for dispersion stirring (rotat...

Embodiment 2

[0066] A method for preparing a homogeneously dispersed positive electrode slurry containing carbon nanotubes, comprising the steps of:

[0067] S1. Mix polyvinylidene fluoride resin and N-methylpyrrolidone at a mass ratio of 6:94, stir and disperse to make polyvinylidene fluoride glue; the steps of stirring and dispersing are: first stir at a speed of revolution 15rpm for 5min Then stir for 150min at a rate of 20rpm revolution and 2500rpm dispersion stirring (ie rotation) to achieve the effect of stirring and dispersing.

[0068] S2. According to the mass ratio of the positive active material lithium iron phosphate and N-methylpyrrolidone is 2:1, add the positive active material into N-methylpyrrolidone for infiltration, stir and disperse to obtain the positive active material infiltration solution; stir and disperse The steps are as follows: first stir at a speed of 15 rpm for 5 minutes; then stir for 80 minutes at a speed of 20 rpm and 2500 rpm for dispersion stirring (rota...

Embodiment 3

[0074] A method for preparing a uniformly dispersed positive electrode slurry containing carbon nanotubes, comprising the steps of:

[0075] S1. Mix polyvinylidene fluoride resin and N-methylpyrrolidone at a mass ratio of 10:90, stir and disperse to make polyvinylidene fluoride glue; the steps of stirring and dispersing are: first stir for 4 minutes at a speed of revolution 13rpm and then stir for 130min at a rate of 30rpm revolution and 2300rpm dispersion stirring (ie rotation) to achieve the effect of stirring and dispersing.

[0076] S2. According to the mass ratio of the positive active material lithium iron phosphate and N-methylpyrrolidone is 2:1, add the positive active material into N-methylpyrrolidone for infiltration, stir and disperse to obtain the positive active material infiltration solution; stir and disperse The steps are as follows: first stir at a speed of 13 rpm for 4 minutes; then stir for 70 minutes at a speed of 30 rpm and 2300 rpm for dispersion stirring...

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Abstract

The invention provides uniformly-dispersed positive paste containing a carbon nanotube, a preparation method thereof and application thereof in a lithium ion battery. The method comprises the steps of 1) mixing polyvinylidene fluoride resin and NMP to prepare a polyvinylidene fluoride glue solution; 2) adding a positive active substance into the NMP for immersion to obtain a positive active substance immersion liquid; 3) mixing the positive active substance immersion liquid and the carbon nanotube conductive paste to obtain a pre-diffusion liquid of the positive paste; and 4) mixing the polyvinylidene fluoride glue solution and the pre-diffusion liquid of the positive paste, performing stirring and diffusion, and obtaining the positive paste containing the carbon nanotube after stable stirring under a condition of only starting revolution and not starting rotation. Each constitute in the positive paste is good in dispersion uniformity, the carbon nanotube is high in dispersion uniformity, the problem of excessively fast agglomeration of the carbon nanotube is prevented, the problem of excessively high sedimentation rate of the positive paste of the lithium ion battery is also prevented, and the conductivity of a pole plate prepared from the paste is improved.

Description

technical field [0001] The invention belongs to the field of preparation of positive electrode slurry for lithium ion batteries, and relates to a positive electrode slurry, its preparation method and application, in particular to a uniformly dispersed positive electrode slurry containing carbon nanotubes, its preparation method and its application in lithium ion batteries use. Background technique [0002] Due to the advantages of high working voltage, high energy density, long cycle life and environmental friendliness, lithium-ion batteries are widely used in 3C digital products, electric vehicles, military aerospace and other fields. [0003] The preparation of slurry is a key process in the production of lithium batteries, and the uniformity of slurry mixing is directly related to the preparation process of subsequent processes and battery performance. At present, the homogenization scheme of the positive electrode carbon nanotube conductive material of lithium ion batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M4/623H01M4/625H01M10/0525Y02E60/10
Inventor 李光邹友生龙猛马成勇吕正中刘金成
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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