Preparation method of ternary positive electrode slurry

A technology of positive electrode slurry and positive electrode active material is applied in the field of preparation of ternary positive electrode slurry, which can solve the problems of affecting the stability of the slurry, affecting the performance of the battery, and the effect is not obvious, so as to reduce the resistance of the pole piece and the internal resistance of the battery. , Conducive to mixing and dispersing, inhibiting the effect of moisture absorption and water absorption

Active Publication Date: 2020-11-13
NINGBO XINSICHUANG AUTO PARTS +1
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Problems solved by technology

Ternary material lithium battery has the characteristics of high specific capacity and high energy density, but it still needs to be improved in terms of cycle performance and safety
The ideal positive electrode slurry is evenly dispersed and has high stability, but the positive electrode slurry is a highly viscous solid-liquid phase suspension, which is prone to agglomeration during slurry mixing, resulting in a poor dispersion state, which not only affects the processing performance of the positive electrode sheet, but also Increase the internal resistance and reduce the safety performance of lithium-ion batteries
[0004] At present, in order to improve the dispersion effect of the positive electrode slurry and the processing performance of the battery, methods such as adding a dispersant, prolonging the stirring time, increasing the stirring speed, dry powder stirring, and increasing the number of feedings are generally used, but the effect is not obvious and there are some problems, such as high speed and long time Stirring causes the temperature of the slurry to rise and deteriorate, which re

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[0038] The preparation method of the ternary cathode slurry provided by the invention comprises the following steps:

[0039] 1) Add the positive electrode active material, conductive agent and binder into the VC high-efficiency mixer according to the mass ratio of (95-97wt%):(1.5-3wt%):(1-1.5wt%), wherein the conductive agent is conductive The composite conductive agent mixed with carbon black and carbon nanotubes according to the mass ratio (0.5~1.5):(0.5~1), the first time of mixing, the speed is 300~450rpm, the time is 10-20min, the first time The number of sieves is 90-150 meshes; the second time of mixing is carried out at a speed of 260-350 rpm for 8-15 minutes, and the second time of sieving is 130-150 meshes to obtain dry powder;

[0040]2) Add the dry powder into the blender, add N-methylpyrrolidone (NMP) with a total weight of 21-36wt% of the dry powder, and let it stand for 20-30min under the vacuum condition of -0.080MPa~-0.085MPa, start stirring, and start with 1...

Embodiment 1

[0045] A preparation method of ternary cathode slurry, comprising the steps of:

[0046] 1) Add NCM523, compound conductive agent (conductive carbon black: carbon nanotube = 1:1), PVDF into VC high-efficiency mixer at a mass ratio of 95.5wt%: 3wt%: 1.5wt%, and perform two mixing and sieve, the rotating speed of the first mixing is 400rpm, and the time is 15min, and the mesh number of the first sieve is 120 mesh; the rotating speed of the second mixing is 350rpm, and the time is 8min, and the mesh number of the second sieving For 150 mesh, obtain dry powder;

[0047] 2) Add the dry powder into the blender, add NMP with a total weight of 30wt% of the dry powder, let it stand for 25 minutes under a vacuum condition of -0.085MPa, start stirring, first rotate at a speed of 20rpm and stir for 20min, and then rotate at a speed of 2000rpm and a revolution of 20rpm The rotation speed is meshed and stirred for 90 minutes under the vacuum of -0.092MPa;

[0048] 3) Add 1.5wt% CN-RI of d...

Embodiment 2

[0055] A preparation method of ternary cathode slurry, comprising the steps of:

[0056] 1) Add NCM523, compound conductive agent (conductive carbon black: carbon nanotube = 0.5:1), PVDF into the VC high-efficiency mixer at a mass ratio of 96wt%: 2.5wt%: 1.5wt%, and perform two mixing and sieve, the rotating speed of the first mixing is 350rpm, and the time is 15min, and the number of sieves is 120 mesh for the first time; For 150 mesh, obtain dry powder;

[0057] 2) Add the dry powder into the blender, add NMP with a total weight of 30wt% of the dry powder, let it stand for 25 minutes under a vacuum condition of -0.085MPa, start stirring, first rotate at a speed of 20rpm and stir for 20min, and then rotate at a speed of 2000rpm and a revolution of 20rpm The rotation speed is meshed and stirred for 90 minutes under the vacuum of -0.092MPa;

[0058] 3) Add 1.0wt% CN-RI of dry powder total weight 20 , stirred at -0.092MPa vacuum for 40min at a rotation speed of 25rpm and a re...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of ternary positive electrode slurry. The preparation method of the ternary positive electrode slurry comprises the following steps: 1) adding a positive electrode active substance, a conductive agent and a binder into a VC efficient mixer, and carrying out mixing and sieving twice to obtain dry powder; 2) adding the dry powder into a stirrer, adding part of a solvent, standing for 20-30 minutes under the vacuum condition of -0.080 MPa to -0.085 MPa, and starting the stirrerfor stirring; 3) adding a carbon nanotube conductive paste, and carrying out stirring in vacuum; and 4) adding the residual solvent, and continuously stirring to obtain the positive electrode slurry.The VC efficient mixer is used for mixing and sieving twice, the mixing efficiency is effectively improved, moisture absorption of slurry in the slurry mixing process is inhibited through vacuum standing, agglomeration is reduced, mixing and dispersion of micron-sized particles in the slurry are facilitated, the internal resistance of the battery is reduced, and the rate capability, the cycle performance and the safety performance of the lithium ion battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a ternary cathode slurry. Background technique [0002] Cathode materials in Li-ion batteries provide Li + , by Li + Moving back and forth between the positive and negative electrodes realizes the charge and discharge of the battery, so the positive electrode of the lithium-ion battery is very important to the battery performance. Ternary material lithium batteries have the characteristics of high specific capacity and high energy density, but they still need to be improved in terms of cycle performance and safety. [0003] In actual production, in addition to material factors, the battery preparation process also has a direct impact on the overall performance of lithium-ion batteries. Among them, the preparation of positive electrode slurry is an important link in the production process of lithium-ion batteries, and the disper...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/625H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 李海望刘志军王军蒲泉钧
Owner NINGBO XINSICHUANG AUTO PARTS
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