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Ternary positive electrode slurry and preparation method thereof

A technology of positive electrode slurry and positive electrode material, which is applied in the field of ternary positive electrode slurry and its preparation, can solve the problems of long dispersion time of ternary slurry, high comprehensive cost, easy agglomeration, etc., and achieve saving glue time and good mixing effect, short-term effect

Pending Publication Date: 2021-08-13
湖南领湃科技股份有限公司 +4
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Problems solved by technology

[0004] In view of this, the embodiments of the present disclosure provide a ternary positive electrode slurry and a preparation method thereof. The preparation method has good dispersion effect, short time, and low cost, and solves the problem that the current ternary slurry has a long dispersion time and is easy to agglomerate. High energy consumption and high overall cost technical problems

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  • Ternary positive electrode slurry and preparation method thereof
  • Ternary positive electrode slurry and preparation method thereof
  • Ternary positive electrode slurry and preparation method thereof

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[0030] The embodiment of the present disclosure provides a preparation method of a ternary positive electrode slurry, which includes: first mixing and stirring the ternary positive electrode material and the binder for 5-60 minutes, then adding a solvent and continuing to stir, and finally adding a conductive agent and continuing to stir for 30- After 240 minutes, the ternary cathode slurry was obtained. Wherein, the binder is added in a powder state. The conductive agent includes but not limited to SP (super pll conductive carbon black), KS-6 (graphite conductive agent), ECP (Ketjen black).

[0031] In the embodiment of the present invention, since the specific surface area of ​​the ternary positive electrode material is much smaller than that of the conductive agent, the ternary positive electrode material is added first, and the viscosity of the slurry is low, which is more conducive to dispersion. In addition, the stirring binder PVDF is added in a powder state, which sav...

Embodiment 1

[0034] The ternary cathode slurry of the present embodiment and its preparation method comprise the following steps:

[0035] (1) Add the ternary positive electrode material, binder PVDF, and conductor agent powder into the mixing tank, rotate at 150 rpm, revolution at 40 rpm, and stir for 15 minutes.

[0036] (2) Add all the NMP solvent, turn on the cooling water, rotate at 200rpm, revolution at 40rpm, stir for 40min, and scrape the material after stirring.

[0037] (3) The rotation is 1200 rpm, the revolution is 40 rpm, and stirring is continued for 40 minutes.

[0038] (4) Add SP and KS-6 conductive agent and stir for 30 minutes, and scrape the material after stirring.

[0039] (5) The rotation is 1400rpm, the revolution is 40rpm, and the vacuum degree is ≤-0.09MPa. After stirring for 60 minutes, scrape the material and continue stirring for 120 minutes.

[0040] (6) Turn off the rotation, adjust the revolution frequency to 25rpm and stir slowly for 30min for vacuum degas...

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Abstract

The invention provides a ternary positive electrode slurry and a preparation method thereof. The method comprises the following steps of mixing and stirring a ternary positive electrode material and a binder for 5-60 min, then adding a solvent and continuing stirring, and finally adding a conductive agent and continuing stirring for 30-240 min to obtain the ternary positive electrode slurry. The ternary positive electrode slurry prepared by the preparation method has the advantages of good dispersion effect, short time and low cost, and solves the technical problems of long dispersion time, easy agglomeration, high energy consumption and high comprehensive cost of the existing ternary slurry.

Description

technical field [0001] The present disclosure relates to the technical field of preparation of lithium battery cell slurry, in particular to a ternary positive electrode slurry and a preparation method thereof. Background technique [0002] With the wide application and rapid development of lithium batteries, people have higher and higher performance requirements for lithium-ion batteries, which not only require lithium batteries to have high energy density, but also require good capacity during repeated charging and discharging. retention rate, exhibits good cycle performance, and has a long service life. The mixing and dispersing process of lithium battery cell slurry has a great influence on the quality of the product in the entire production process of lithium ion batteries, and is the most important link in the entire production process. The positive electrode is the most important part of the lithium battery, which determines the core electrochemical performance of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/485H01M10/0525
CPCH01M4/139H01M4/485H01M10/0525H01M2004/028Y02E60/10
Inventor 周盈
Owner 湖南领湃科技股份有限公司
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