A lithium ion battery negative electrode slurry and a preparation method thereof

A lithium-ion battery and negative electrode slurry technology, which is applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as unstable improvement effects, high equipment performance requirements, and poor appearance of negative electrode sheets, so as to avoid pockmarked appearance Defects, low production cost, and improved coating uniformity

Inactive Publication Date: 2019-01-04
HUIZHOU TOPBAND ELECTRICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem of poor appearance of the coated negative electrode sheet, there are currently two solutions. The first is to improve the dispersion of the negative electrode slurry: such as high-speed dispersion, kneading and stirring, etc.; but in this way, the equipment High performance requirements, large investment, difficult to popularize and apply
The second is to change the composition of the negative electrode slurry, which will affect the performance of the battery cell. At the same time, the improvement effect is unstable and needs to be repeated.

Method used

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  • A lithium ion battery negative electrode slurry and a preparation method thereof
  • A lithium ion battery negative electrode slurry and a preparation method thereof
  • A lithium ion battery negative electrode slurry and a preparation method thereof

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preparation example Construction

[0080] The preparation method of the lithium ion battery negative electrode slurry of the present embodiment, it comprises the following steps:

[0081] S1. Preparation of stabilizer solution: Add 1.0%-2.0% stabilizer and 4%-8% solvent into the dissolving tank, and stir until evenly mixed.

[0082] Wherein, the stabilizer is ethylene carbonate, and the solvent is deionized water; specifically, the solid ethylene carbonate is placed in a high-temperature room or an oven until the ethylene carbonate is completely dissolved; then the dissolved ethylene carbonate solution is mixed with Add deionized water into the dissolution tank together, set the rotation speed at 30±2 rpm, and stir for 60 minutes to prepare an aqueous solution of ethylene carbonate.

[0083] S2. Prepare anti-precipitation agent solution: add 0.6%-1.0% anti-precipitation agent and 34%-41% solvent into the dissolving tank, stir until mixed evenly.

[0084] Among them, the anti-precipitation agent is sodium hydro...

Embodiment 1

[0109] Ethylene carbonate aqueous solution preparation:

[0110] Place the solid ethylene carbonate in a high-temperature room or oven, set the baking temperature at 50±5°C until the ethylene carbonate is completely dissolved; take 3.0Kg of dissolved ethylene carbonate liquid and 12.0Kg of deionized water into 30L for dissolution In the tank, set the rotation speed at 30±2rpm, and stir for 60min to obtain an aqueous solution of ethylene carbonate;

[0111] WSC-C solution preparation:

[0112] Add 1.5Kg of WSC-C powder and 81.83Kg of deionized water into a 100L dissolution tank, set the rotation speed at 30±2rpm, and stir for 360min to prepare the WSC-C solution;

[0113] Negative electrode slurry preparation:

[0114] Add 94Kg graphite (FSNC-1) and 2.0Kg Super-P into the 350L mixer, set the revolution to 30±2rpm, the rotation to 200±20rpm, and stir for 30min; Revolution 30±2rpm, autorotation 200±20rpm, stir for 120min; after stirring, add 32.50Kg WSC-C solution, 15.0Kg ethy...

Embodiment 2

[0116] Preparation of Ethylene Carbonate SBR Emulsion:

[0117] Place the solid ethylene carbonate in a high-temperature room or oven, set the baking temperature at 50±5°C until the ethylene carbonate is completely dissolved; take 3.0Kg of the dissolved ethylene carbonate liquid, 5.0Kg of styrene-butadiene rubber emulsion and deionized Add 2.0Kg of water into a 15L dissolving tank, set the speed at 30±2rpm, and stir for 60min to prepare ethylene carbonate styrene-butadiene rubber emulsion;

[0118] WSC-C solution preparation:

[0119] Add 1.5Kg of WSC-C powder and 81.83Kg of deionized water into a 100L dissolution tank, set the rotation speed at 30±2rpm, and stir for 360min to prepare the WSC-C solution;

[0120] Negative electrode slurry preparation:

[0121] Add 94.50Kg of graphite (AML-400) and 1.50Kg of Super-P into a 350L dissolving tank, set the revolution at 30±2rpm, rotate at 200±20rpm, and stir for 30min; after stirring, add 50.83K WSC-C solution into the mixer , s...

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Abstract

The invention relates to a lithium ion battery negative electrode slurry and a preparation method thereof. The lithium ion battery negative electrode slurry comprises the following raw material components in percentage by mass: 45.0 to 48.0 percent of active substance; 0.6 to 1.0 percent of conductive agent, 0.6 to 1.0 percent of anti-precipitation agent, 2.0 to 3.0 percent of binder, 1.0 to 2.0 percent of stabilizer, solvent: balance; the lithium-ion battery negative electrode slurry can greatly solve the problems of bubbles, black spots, pits and other poor appearance, especially the pittingproblem. The negative electrode paste of the lithium ion battery has the advantages of low manufacturing cost and wide application range, and the battery prepared from the negative electrode paste ofthe lithium ion battery has stable cell performance. The preparation method of the negative electrode slurry of the lithium ion battery has the advantages of simple operation, low equipment requirement and convenient popularization and application.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery negative electrode slurry and a preparation method thereof. Background technique [0002] Lithium-ion batteries have developed rapidly since they were officially commercialized by Sony Corporation of Japan in the 1990s, and are widely used in 3C, energy storage, power batteries and other fields. With the development of new energy vehicles in the world, lithium-ion batteries have developed into a new stage as power batteries; at the same time, as power batteries, their performance and safety requirements are getting higher and higher, and the manufacturing requirements for lithium-ion batteries are also increasing. high; [0003] At present, the negative electrodes of mainstream lithium-ion battery enterprises still use copper foil as the current collector and graphite system as the active material; as one of the key links in the manufacture of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393H01M4/04H01M4/62H01M10/0525
CPCH01M4/0404H01M4/133H01M4/1393H01M4/62H01M10/0525Y02E60/10
Inventor 陈振双
Owner HUIZHOU TOPBAND ELECTRICAL TECH CO LTD
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