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Preparation method of battery slurry with high solid content

A high solid content, conductive slurry technology, applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of uneven dispersion of carbon nanotubes, low solid content of battery slurry, etc., to achieve high weight consistency, The effect of improving dispersion performance and increasing solid content

Active Publication Date: 2018-03-23
沈阳国科金能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the problems existing in the prior art, the object of the present invention is to provide a method for preparing battery slurry with uniform dispersion and high solid content containing carbon nanotubes, and the positive electrode slurry prepared by the method of the present invention has uniform dispersion of carbon nanotubes , to solve the problems of the prior art due to uneven dispersion of carbon nanotubes and low solid content of battery slurry

Method used

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  • Preparation method of battery slurry with high solid content
  • Preparation method of battery slurry with high solid content
  • Preparation method of battery slurry with high solid content

Examples

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Effect test

Embodiment 1

[0050] In this embodiment, the preparation method of the positive electrode slurry of high solid content battery containing carbon nanotubes (for the process flow chart, see figure 1 ), including the following steps:

[0051] (1) Mix and stir polyvinylidene fluoride resin and N-methylpyrrolidone according to the mass ratio of 5:95 to make polyvinylidene fluoride glue; the steps of stirring and dispersing are as follows: first stir at a revolution speed of 20rpm for 5min, Fully wet the polyvinylidene fluoride resin; then stir at a speed of 25 rpm for revolution and 1500 rpm for dispersion (rotation) for 90 minutes to prepare polyvinylidene fluoride glue.

[0052] (2) Add carbon nanotube (CNT) conductive paste and surfactant sodium dodecylbenzene sulfonate into polyvinylidene fluoride glue and stir, wherein carbon nanotube conductive paste, surfactant and partial Polyvinyl difluoride glue is mixed and stirred according to the mass ratio of 1:0.5:15 to obtain the CNT mixed solut...

Embodiment 2

[0060] In this embodiment, the preparation method of the positive electrode slurry of high solid content battery containing carbon nanotubes (for the process flow chart, see figure 1 ), including the following steps:

[0061] (1) Mix and stir polyvinylidene fluoride resin and N-methylpyrrolidone according to the mass ratio of 3:97 to make polyvinylidene fluoride glue; the steps of stirring and dispersing are as follows: first stir at a revolution speed of 10 rpm for 5 minutes, Fully wet the polyvinylidene fluoride resin; then stir at a speed of 30 rpm for revolution and 1000 rpm for dispersion (rotation) for 90 minutes to prepare polyvinylidene fluoride glue.

[0062] (2) Add carbon nanotube (CNT) conductive paste and surfactant polyethylene glycol into polyvinylidene fluoride glue and stir, wherein carbon nanotube conductive paste, surfactant and polyvinylidene fluoride The glue is mixed and stirred according to the mass ratio of 1:0.3:20 to obtain the CNT mixed solution sea...

Embodiment 3

[0069] In this embodiment, the preparation method of the positive electrode slurry of high solid content battery containing carbon nanotubes (for the process flow chart, see figure 1 ), including the following steps:

[0070](1) Mix and stir polyvinylidene fluoride resin and N-methylpyrrolidone according to the mass ratio of 4:96 to make polyvinylidene fluoride glue; the steps of stirring and dispersing are: first stir at a revolution speed of 10 rpm for 10 minutes, Fully wet the polyvinylidene fluoride resin; then stir for 60 minutes at a speed of 20 rpm in revolution and 1000 rpm in dispersion (rotation) to prepare polyvinylidene fluoride glue.

[0071] (2) Add carbon nanotube (CNT) conductive paste and surfactant diethanolamide laurate to polyvinylidene fluoride glue and stir, wherein carbon nanotube conductive paste, surfactant and polyvinylidene fluoride The vinyl fluoride glue is mixed and stirred according to the mass ratio of 1:0.8:19 to obtain the CNT mixed solution ...

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Abstract

The invention belongs to the field of preparation of positive pole slurry of a lithium-ion battery, and particularly relates to a preparation method of battery slurry with high solid content. The preparation method comprises the following steps: 1) mixing a binder polyvinylidene difluoride resin with a solvent to prepare a meta-polyvinyl difluoride adhesive solution; 2) adding carbon-nanotube conductive slurry and a surface active agent into the meta-polyvinyl difluoride adhesive solution for mixing to obtain a carbon-nanotube mixed solution sealed by the binder; 3) adding a positive pole active substance into a solvent for soaking, thus obtaining soaking liquid of the positive pole active substance; 4) adding the carbon-nanotube mixed solution sealed by the binder into the fully-wetted positive pole active substance, and stirring for dispersion to obtain the positive pole slurry containing carbon nanotubes. The preparation method has the advantages that the dispersion uniformity of all the components in the positive pole slurry is good, and the dispersion uniformity of the carbon nanotubes is high; the surface active agent is added in the dispersion process, and the binder adoptedis a polymer, and in the process, the surface active agent and the polymer generate bidirectional action to disperse the carbon nanotubes in an auxiliary manner, so that the problem of agglomerationof the carbon nanotubes is avoided.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-ion battery cathode slurry, in particular to a method for preparing battery slurry with high solid content. Background technique [0002] Accelerating the development of new energy vehicles is a strategic measure to effectively alleviate the pressure on energy and the environment, accelerate the transformation and upgrading of the automobile industry, and cultivate new economic growth points. The national "Energy Conservation and New Energy Vehicle Industry Development Plan" clearly states that by 2020, the cumulative production and sales of pure electric vehicles and plug-in hybrid vehicles will reach 5 million. [0003] Large-capacity lithium-ion batteries have been widely used as power batteries, and will become one of the main power sources for electric vehicles, and will be used in large-scale energy storage, such as: large-scale wind energy, solar energy storage power stations and other...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/139H01M10/0525
CPCH01M4/04H01M4/139H01M10/0525Y02E60/10
Inventor 刘壮闻雷吴敏杰唐昌平曹贺杨林张福生
Owner 沈阳国科金能科技有限公司
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