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Preparation method of mixed positive electrode slurry based on lithium manganate material

A technology of mixing positive electrode and slurry, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of short holding time, affecting the quality of coated positive electrode, poor stability, etc., to achieve easy operation, improve conductivity, High stability effect

Active Publication Date: 2019-05-21
陕西力创鑫电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, lithium cobaltate and lithium manganate are mostly mixed to prepare composite power battery electrodes, thereby reducing costs. However, due to the poor stability of the slurry composed of lithium cobaltate and lithium manganate, the retention time is relatively short. Therefore, the quality of the coated positive electrode is affected. To address the above problems, the present invention provides a method for preparing a mixed positive electrode slurry based on lithium manganate material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1), providing a lithium manganate material with an average particle diameter R1 of 350nm, hereinafter referred to as the first particle, and a lithium manganate material with an average particle diameter R2 of 800nm, hereinafter referred to as the second particle, the first particle and The mass ratio of the second particle is 1:9, providing a lithium cobaltate material with an average particle diameter R3 of 530nm, wherein the total amount of the lithium manganate material accounts for 70wt% of the total amount of the active material;

[0027] 2) Add NMP to the first stirred tank, add PVDF, stir and mix for 2 hours; ball mill the first particles and conductive carbon black for 6 hours; then add the obtained mixture to the first stirred tank and vacuumize Stir for 3h to obtain the first slurry, the first particles: conductive carbon black: PVDF=100:8:5;

[0028] 3) Add NMP to the second stirred tank, add PVDF, stir and mix for 2 hours, add lithium cobaltate material, va...

Embodiment 2

[0032] 1), providing a lithium manganate material with an average particle diameter R1 of 400nm, hereinafter referred to as the first particle, and a lithium manganate material with an average particle diameter R2 of 900nm, hereinafter referred to as the second particle, the first particle and The mass ratio of the second particle is 3:7, providing a lithium cobaltate material with an average particle diameter R3 of 600nm; wherein the total amount of the lithium manganate material accounts for 85wt% of the total amount of the active material;

[0033] 2) Add NMP to the first stirred tank, add PVDF, stir and mix for 2 hours; ball mill the first particles and conductive carbon black for 6 hours; then add the obtained mixture to the first stirred tank and vacuumize Stir for 3h to obtain the first slurry, the first particles: conductive carbon black: PVDF=100:10:5;

[0034] 3) Add NMP to the second stirred tank, add PVDF, stir and mix for 2 hours, add lithium cobaltate material, v...

Embodiment 3

[0038] 1), providing a lithium manganate material with an average particle diameter R1 of 400nm, referred to as the first particle hereinafter, and a lithium manganate material with an average particle diameter R2 of 800nm, referred to as the second particle hereinafter, the first particle and The mass ratio of the second particle is 2:8, providing a lithium cobaltate material with an average particle diameter R3 of 540nm; wherein the total amount of the lithium manganate material accounts for 80wt% of the total amount of the active material;

[0039] 2) Add NMP to the first stirred tank, add PVDF, stir and mix for 2 hours; ball mill the first particles and conductive carbon black for 6 hours; then add the obtained mixture to the first stirred tank and vacuumize Stir for 3h to obtain the first slurry, the first particle: conductive carbon black: PVDF=100:9:4;

[0040] 3) Add NMP to the second stirred tank, add PVDF, stir and mix for 2 hours, add lithium cobaltate material, vac...

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Abstract

The invention provides a preparation method of mixed positive electrode slurry based on a lithium manganate material. The mixed positive electrode slurry comprises an active material taking the lithium manganate material as a main material and lithium cobalt oxide as an auxiliary material; the lithium manganate accounts for 70-85wt% of the total amount of the active material; the lithium manganatecomprises first particles with the average particle size of R1 and second particles with the average particle size of R2; the mass ratio of the first particles to the second particles is a : b; and the average particle size R3 of the lithium cobalt oxide is between 0.7*(R1*a+R2*b) / (a+b) and 0.8*(R1*a+R2*b). The first particles, the second particles and the lithium cobalt oxide material are mixedand stirred separately, so that rapid and uniform mixing dispersion is realized, the dispersity and stability of the slurry are improved, and the stability of pole piece coating is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery production, in particular to a method for preparing a mixed positive electrode slurry based on lithium manganate material. Background technique [0002] Lithium manganese oxide is one of the more promising lithium ion cathode materials. Compared with traditional cathode materials such as lithium cobalt oxide, lithium manganate has the advantages of abundant resources, low cost, no pollution, good safety, and good rate performance. It is an ideal However, its poor cycle performance and electrochemical stability greatly limit its industrialization. Lithium manganate is mainly spinel-type lithium manganate, which has a stable structure and is easy to realize industrial production. Today's market products all have this structure. Spinel-type lithium manganese oxide belongs to the cubic crystal system, Fd3m space group, and the theoretical specific capacity is 148mAh / g. Due to the three-di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 李壮
Owner 陕西力创鑫电子科技有限公司
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