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Cathode slurry material preparation method

A slurry and cathode technology, which is applied in the field of cathode slurry preparation, can solve the problems of increasing the difficulty of mixing and dispersing processes, and achieve the effects of increasing life, increasing energy density, and avoiding settlement

Active Publication Date: 2019-02-01
浙江永高电池股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, with the continuous improvement of lithium-ion battery materials, the particle size of raw materials is getting smaller and smaller, which not only improves the performance of lithium-ion batteries, but also easily forms secondary aggregates, which increases the difficulty of the mixing and dispersing process

Method used

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  • Cathode slurry material preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Provide LiCo 0.97 Al 0.03 o 2 , the LiCo 0.97 Al 0.03 o 2 The particle size is 500nm-1μm; the LiCo 0.97 Al 0.03 o 2 mixed with polyaniline according to the mass ratio of 100:5 and ball milled for 6 hours to obtain polyaniline-coated LiCo 0.97 Al 0.03 o 2 ;

[0027] 2) Add NMP into the first vacuum stirred tank, keep the temperature in the vacuum stirred tank at 5°C, add PVDF and sodium carboxymethyl cellulose into the first vacuum stirred tank, stir for 4 hours, add length For carbon nanotubes of 10 μm, stir for 2 hours, add the product of step 1, stir for 2 hours, add NMP to adjust the solid content of the slurry to 50%, stir for 1 hour, and then vacuumize and stir for 1 hour to obtain the first slurry, wherein the mass ratio, the Polyaniline-coated LiCo 0.97 Al 0.03 o 2 : PVDF: sodium carboxymethyl cellulose: carbon nanotubes = 100:3:2:6;

[0028] 3) Provide LiMnPO 4 f 0.01 / C, where the C content is 3wt%, the LiMnPO 4 f 0.01 / C particle size is ...

Embodiment 2

[0031] 1) Provide LiCo 0.97 Al 0.03 o 2 , the LiCo 0.97 Al 0.03 o 2 The particle size is 1 μm; the LiCo 0.97 Al 0.03 o 2mixed with polyaniline according to the mass ratio of 100:10 and ball milled for 6 hours to obtain polyaniline-coated LiCo 0.97 Al 0.03 o 2 ;

[0032] 2) Add NMP into the first vacuum stirred tank, keep the temperature in the vacuum stirred tank at 5°C, add PVDF and sodium carboxymethyl cellulose into the first vacuum stirred tank, stir for 6h, add length 20 μm carbon nanotubes, stirred for 3 hours, added the product of step 1, stirred for 2-4 hours, added NMP to adjust the solid content of the slurry to 55%, stirred for 1-2 hours, and then vacuumed and stirred for 2 hours to obtain the first slurry, wherein mass ratio, the polyaniline-coated LiCo 0.97 Al 0.03 o 2 : PVDF: sodium carboxymethyl cellulose: carbon nanotubes = 100:5:4:8;

[0033] 3) Provide LiMnPO 4 f 0.01 / C, where the C content is 3wt%, the LiMnPO 4 f 0.01 / C particle size is ...

Embodiment 3

[0036] 1) Provide LiCo 0.97 Al 0.03 o 2 , the LiCo 0.97 Al 0.03 o 2 The particle size is 800nm; the LiCo 0.97 Al 0.03 o 2 mixed with polyaniline according to the mass ratio of 100:8 and ball-milled for 6 hours to obtain polyaniline-coated LiCo 0.97 Al 0.03 o 2 ;

[0037] 2) Add NMP into the first vacuum stirred tank, keep the temperature in the vacuum stirred tank at 8°C, add PVDF and sodium carboxymethyl cellulose into the first vacuum stirred tank, stir for 5h, add length For carbon nanotubes of 15 μm, stir for 3 hours, add the product of step 1, stir for 3 hours, add NMP to adjust the solid content of the slurry to 55%, stir for 2 hours, and then vacuumize and stir for 2 hours to obtain the first slurry, wherein the mass ratio, the Polyaniline-coated LiCo 0.97 Al 0.03 o 2 : PVDF: sodium carboxymethyl cellulose: carbon nanotubes = 100:4:3:7;

[0038] 3) Provide LiMnPO 4 f 0.01 / C, where the C content is 3wt%, the LiMnPO 4 f 0.01 / C particle size is 100nm; ...

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Abstract

The invention provides a cathode slurry material preparation method. The method includes shearing a slurry material at a high speed to improve the dispersibility of the slurry material; respectively preparing the slurry materials for multiple active materials under specific conditions; and improving the dispersibility of different active materials by controlling the process of preparing the slurrymaterials. Through the method, the cathode slurry material with high dispersibility and stable performance can be obtained.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery production, in particular to a preparation method of cathode slurry. Background technique [0002] For the electrode manufacturing of lithium-ion batteries, the positive electrode slurry is composed of binder, conductive agent, positive electrode material, etc.; the negative electrode slurry is composed of binder, graphite carbon powder, etc. The preparation of positive and negative electrode slurries includes a series of processes such as mixing, dissolving, and dispersing between liquid and liquid, liquid and solid materials, and this process is accompanied by changes in temperature, viscosity, and environment. In the positive and negative electrode slurries, the dispersion and uniformity of granular active materials directly affect the movement of lithium ions between the two electrodes of the battery. Therefore, the mixing and dispersion of the slurry of each electrode material in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1391H01M4/62
CPCH01M4/04H01M4/1391H01M4/625H01M4/628Y02E60/10
Inventor 邓丽萍
Owner 浙江永高电池股份有限公司
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