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Preparation method of electrode plate, electrode plate and secondary battery

A technology of electrode pole pieces and electrode active materials, which is applied in the field of secondary batteries, can solve the problems of not being able to ensure that the slurry is evenly coated on the current collector, affecting the transfer of electrons and ions, etc., to ensure capacity and rate performance, and save energy consumption , to ensure the effect of uniformity

Pending Publication Date: 2022-03-18
HUNAN LIFANG NEW ENERGY SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the objectives of the present invention is to provide a method for preparing electrode pole pieces to solve the problem that the current thick electrode preparation method cannot ensure that the slurry is evenly coated on the current collector, which affects the transfer of electrons and ions and causes ohmic electrodes inside the electrode. Polarization and Concentration Polarization

Method used

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preparation example Construction

[0020] The first aspect of the present invention is to provide a method for preparing an electrode pole piece, comprising the following steps:

[0021] S1. Mix and disperse the electrode active material, binder, conductive agent, and solvent to make a slurry with a solid content of 30-90%;

[0022] S2. Concentrating the slurry obtained in step S1 to remove the solvent to obtain a powder with a solid content of more than 90%;

[0023] S3. Pressing the powder obtained in step S2 to at least one surface of the current collector by dry lamination equipment to obtain an electrode sheet.

[0024] Wherein, the electrode active material is a positive electrode active material or a negative electrode active material, and correspondingly, the slurry is a positive electrode slurry or a negative electrode slurry.

[0025] When the electrode active material is a positive electrode active material, the positive electrode active material may include but not limited to chemical formula such ...

Embodiment 1

[0041] A method for preparing a positive electrode sheet, comprising the following steps:

[0042] S1. Using a kneading wet process to mix the positive electrode active material, binder, conductive agent, and solvent, and disperse at high speed to make a slurry with a solid content of 70%;

[0043] S2. Perform concentrated desolventization (NMP) on the slurry obtained in step S1 by means of spray drying, the ambient temperature is 80° C., and the drying time is 1 to 10 s to obtain a powder with a solid content of more than 90%;

[0044] S3. Pressing the powder obtained in step S2 to at least one surface of the current collector by dry lamination equipment. The pressing temperature of the powder is greater than or equal to 60° C. to obtain a positive electrode sheet with a thickness of 120-2000 μm. The energy consumption of the preparation is 280 kWh.

Embodiment 2

[0046] A method for preparing a positive electrode sheet, comprising the following steps:

[0047] S1. Using a kneading wet process to mix the positive electrode active material, binder, conductive agent, and solvent, and disperse at high speed to make a slurry with a solid content of 70%;

[0048] S2. Put the slurry obtained in step S1 in a fluidized bed for concentrated desolventization (NMP), the ambient temperature is 100° C., and the drying time is 1 to 2 hours to obtain a powder with a solid content of more than 90%;

[0049] S3. Pressing the powder obtained in step S2 to at least one surface of the current collector by dry lamination equipment. The pressing temperature of the powder is greater than or equal to 60° C. to obtain a positive electrode sheet with a thickness of 120-2000 μm. The energy consumption of the preparation is 350 kWh.

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Abstract

The invention provides a preparation method of an electrode plate, the electrode plate and a secondary battery, and the preparation method comprises the following steps: S1, mixing and dispersing an electrode active material, a binder, a conductive agent and a solvent to prepare slurry with the solid content of 30-90%; s2, concentrated solvent removal is conducted on the slurry obtained in the step S1, and powder with the solid content being 90% or above is obtained; and S3, pressing the powder obtained in the step S2 to at least one surface of a current collector through dry-method compounding equipment to obtain the electrode plate. Compared with the prior art, the preparation method provided by the invention adopts a dry-wet combined process to prepare the thick electrode, ensures that the slurry is uniformly dispersed on the current collector, and greatly reduces the transmission difference between electrons and ions, thereby ensuring the capacity and rate capability of the battery.

Description

technical field [0001] The invention relates to the field of secondary batteries, in particular to a method for preparing an electrode pole piece, an electrode pole piece and a secondary battery. Background technique [0002] Due to the rapid development of new energy electric vehicles and people's long-standing anxiety about the battery life of electric vehicles, car companies have higher and higher requirements for the power and energy of lithium-ion power batteries, and they are also paying close attention to costs. The core component that affects the performance of lithium-ion power batteries is the electrode. In order to make the energy density of the single cell higher and the cost lower, the proportion of active materials in the single cell can be increased as much as possible while ensuring safe operation, among which thick electrodes are the best method. However, thick electrodes will bring new problems, especially the interface problem. During the charging and dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/04H01M4/13H01M10/0525
CPCH01M4/139H01M4/13H01M4/0416H01M10/0525Y02E60/10
Inventor 刘良海徐雄文王志斌刘克永胡海波刘丰涂健
Owner HUNAN LIFANG NEW ENERGY SCI & TECH
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