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Preparation method of coating slurry based on lithium manganese iron phosphate flexible slurry wrapped ternary material

A technology of lithium iron manganese phosphate and ternary materials, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of unfavorable material circulation, large differences, damage to the integrity of ternary lattices, etc., to improve the cycle The performance, the method is simple and easy to implement, and the effect of convenient industrial production

Active Publication Date: 2018-10-16
南阳逢源新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The voltage platform of lithium iron phosphate is lower than 3.2, which is quite different from the ternary voltage platform. In addition, the finished ternary material by ball milling will destroy the integrity of the ternary lattice, which is not conducive to material circulation.

Method used

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  • Preparation method of coating slurry based on lithium manganese iron phosphate flexible slurry wrapped ternary material
  • Preparation method of coating slurry based on lithium manganese iron phosphate flexible slurry wrapped ternary material
  • Preparation method of coating slurry based on lithium manganese iron phosphate flexible slurry wrapped ternary material

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preparation example Construction

[0024] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings. Such as Figure 1-4 Shown: a method for preparing coating slurry based on lithium manganese iron phosphate flexible coating ternary material, comprising the following steps:

[0025] (1) Weigh the flexible film-forming material, add N-methylpyrrolidone, dissolve and configure a viscous emulsion with a mass percentage of 2%-10%, stir to disperse or ball mill, the stirring speed is 300-12000 rpm, and the time is Between 5-240 minutes;

[0026] (2) Weigh the conductive agent of SUPER-P, conductive graphite or conductive carbon powder with a total solid content of 0-10% in the designed system;

[0027] (3) Weigh 5%-50% of the solid content of the designed system, lithium manganese iron phosphate material;

[0028] (4) Add the weighed lithium manganese iron phosphate into the prepared viscous emulsion, disperse and stir, or ultrason...

example 1

[0037] (1) Calculation in proportion: weigh 95g of N-methylpyrrolidone, 3g of PVDF and 2g of polyacrylic acid resin, disperse, stir and dissolve for 60 minutes. Configured as a 5% viscous emulsion;

[0038](2) Weigh SP with a total solid content of 5g, add it to the viscous emulsion prepared in the previous step, stir and disperse for 30 minutes, and make a uniform emulsion with good conductivity;

[0039] (3) Weigh the preferred nano-scale Mn:Fe=7:3 lithium manganese iron phosphate, material 10g, add to the viscous emulsion prepared in the previous step and ball mill for homogenization for 60 minutes. Configured into a uniform viscous and easy-to-film-forming slurry emulsion of lithium manganese iron phosphate;

[0040] (4) Weigh 80g of the pre-selected NCM622 ternary material. Add it into the prepared viscous easy film-forming emulsion, stir and disperse evenly, and the time is 180 minutes. In this step, it is enough to stir and disperse evenly, so that the ternary materi...

example 2

[0043] (1) Calculation in proportion: weigh 90g of N-methylpyrrolidone, 2g of PVDF and 8g of polyacrylic acid resin, disperse, stir and dissolve for 100 minutes. Configured as a 10% viscous emulsion;

[0044] (2) Weigh conductive graphite with a total solid content of 5gde, add it to the viscous emulsion prepared in the previous step, stir and disperse for 60 minutes, and make a uniform emulsion with good conductivity;

[0045] (3) Weigh the preferred nano-scale Mn:Fe=8:2 lithium manganese iron phosphate, material 15g, add to the viscous emulsion prepared in the previous step and ball mill for 30 minutes. Configured into a uniform viscous and easy-to-film-forming slurry emulsion of lithium manganese iron phosphate;

[0046] (4) Weigh 75g of the pre-selected NCM523 ternary material. Add it into the prepared viscous easy film-forming emulsion, stir and disperse evenly, and the time is 200 minutes. Dispersing stirring speed 2000 rpm. Stir and disperse evenly, so that the tern...

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Abstract

The invention discloses a preparation method of coating slurry based on a lithium manganese iron phosphate flexible slurry wrapped ternary material. The preparation method comprises the following steps of: (1) weighing a flexible film-forming material, adding N-methyl pyrrolidone, dissolving and preparing a viscous emulsion with a mass percentage of 2% to 10%, stirring and dispersing or ball milling; (2) weighing the conductive agent of SUPER-P, conductive graphite or conductive carbon powder of which a total solid content of a design system is 0%-10%; (3) weighing the lithium manganese iron phosphate material of which the total solid content of the design system is 5% to 50%; (4) adding the weighed lithium manganese iron phosphate into the prepared viscous emulsion, and preparing a uniform viscous film-forming slurry wrapped emulsion by dispersing and stirring, or ultrasonic dispersion, or ball milling and homogenizing; and (5) weighing the ternary material of which the solid contentof the design system is 50% to 95%, adding the ternary material into the prepared coating emulsion, and stirring and dispersing the mixture uniformly, so as to prepare the lithium iron manganese phosphate flexible coating ternary material that can be used for direct coating. According to the preparation method of coating slurry based on a flexible coating ternary material containing lithium manganese phosphate, the safety problem of the ternary materials is effectively solved, the cycle life and energy density are improved, and the method is simple and reliable and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of post-treatment of positive electrode materials of lithium ion batteries, in particular to a method for preparing coating slurry based on lithium manganese iron phosphate flexible slurry-coated ternary material. Background technique [0002] With the increasing development of electric vehicles, people have put forward higher requirements for the energy density of electric vehicle batteries. Ternary materials have high energy density and are widely used in the positive electrode materials of electric vehicle batteries. Researchers in the industry have done a lot of research work on this, so that the energy density of ternary materials has also been greatly improved. There are NCM523 to NCM622, then to NCM811, and NCA811. With the continuous increase of nickel content in ternary materials, the specific capacity of ternary materials has also increased significantly. However, the safety and cycle life of mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 孙青林魏宏政贾庆煜段玉宾
Owner 南阳逢源新能源科技有限公司
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