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Preparation method of lithium ion battery positive electrode slurry

A lithium-ion battery and positive electrode slurry technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problem of large specific surface area of ​​high-performance graphene composite conductive paste, affecting the health of workers in the production workshop, and the toxicity of the production site Large and other problems, to achieve the effect of improving high-power start-up performance, reducing ohmic internal resistance and polarization internal resistance, and good dispersion

Inactive Publication Date: 2021-10-26
湖北中聚能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, NMP is volatile, flammable, explosive, and highly toxic, which can easily cause serious environmental pollution, make the production site highly toxic, and seriously affect the health of the production workshop staff.
However, the high-performance graphene composite conductive paste has a large specific surface area, is prone to agglomeration, and is not easy to disperse evenly in solvents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The preparation method of lithium ion battery cathode slurry of the present invention may comprise the following steps:

[0022] S1. Mix high-performance graphene composite conductive paste, water-based binder and deionized water, stir and glue, to obtain mixed paste.

[0023] Among them, the water-based binder is made of water-based glue made of acrylonitrile multi-polymer, in which the acrylonitrile multi-polymer is used as a solute, and its content accounts for 16% by weight of the total amount of the water-based glue. The conductivity of the added deionized water is less than or equal to 1 μs / cm, and the amount of the added deionized water is such that the solid content of the obtained mixed slurry is 45-65 wt%. The revolution of stirring and beating is 20~30rmp, and the speed of dispersion is 2500~4000rmp. Stirring time 60 ~ 120min.

[0024] S2. Kneading and stirring the lithium manganate and the conductive agent to obtain a mixed powder. The revolution of knead...

Embodiment 1

[0033] (1) Mix 1041.6g of water-based adhesive ADY-701A (solid content: 16wt%), 485g of water as a solvent, and 1587g of high-performance graphene composite conductive paste (solid content: 6.3wt%), and put it in Guangzhou Senhong The mixer stirs for 100min at a revolution speed of 25rpm / min and a dispersion speed of 2500rpm / min; the measured viscosity is 3500mPa·s.

[0034] (2) Add 3000g of lithium manganate active material and 66.6g of conductive agent SP into the Guangzhou Senhong mixer and stir for 180min at a revolution speed of 15rpm / min and a dispersion speed of 1500rpm / min.

[0035] (3), then add (1) the well-stirred glue into (2) the kneaded powder for two stages of adding and stirring: first add (1) 20% of the weight of the glue, a total of 622.9g, Stir the slurry at a revolution speed of 15rpm / min and a dispersion speed of 1500rpm / min for 30min to achieve a pre-dispersed mud-like effect, then add (1) 80% of the weight of the glue solution, a total of 2491.5g, at a r...

Embodiment 2

[0038] (1), mix 815.2gADY-701A (solid content is 16wt%), 385.3g water as solvent, 1294g high-performance graphene composite conductive paste (solid content is 6.3wt%), put into Guangzhou Senhong mixer to Revolution speed 25rpm / min, dispersion speed 2500rpm / min and stir for 100min; measured viscosity was 3400mPa·s.

[0039] (2) Add 3000g of lithium manganate active material and 48.9g of conductive agent SP into the Morihiro mixer and stir for 180min at a revolution speed of 15rpm / min and a dispersion speed of 1500rpm / min.

[0040] (3) Add (1) the stirred glue into the above (2) kneaded powder for two stages of addition and stirring: first add (1): 20% of the weight of the glue, a total of 499g, Stir the slurry at a revolution speed of 15rpm / min and a dispersion speed of 1500rpm / min for 30min to achieve a pre-dispersed mud-like effect, then add (1) 80% of the weight of the glue 1995.6g at a revolution speed of 50rpm / min and a dispersion speed of 3000rpm / min high-speed stirring...

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Abstract

The invention discloses a preparation of a lithium ion battery positive electrode slurry. Deionized water is used as a dispersion medium, so that the dispersity of aqueous positive electrode slurry is improved, environmental pollution caused by use of an organic solvent is avoided, and the preparation method is more environment-friendly and safer; in the components of the aqueous positive electrode slurry, the contents of the conductive agent and the aqueous binder are optimized, and meanwhile, the high-performance graphene composite conductive slurry is also used as the conductive agent, so that the ohmic internal resistance and polarization internal resistance of the battery can be reduced, and the high-power starting performance of the lithium battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a positive electrode slurry of a lithium ion battery. Background technique [0002] Lithium manganese oxide is mainly spinel-type lithium manganate. Spinel-type lithium manganate LiMn2O4 is a positive electrode material with three-dimensional lithium ion channels firstly prepared by Hunter in 1981. It has been highly favored by many scholars and researchers at home and abroad. As an electrode material, it has the advantages of low price, high potential, environmental friendliness, and high safety performance. It is the most promising cathode material to replace lithium cobaltate LiCoO2 as a new generation of lithium-ion batteries. [0003] High-performance graphene composite conductive agent is an emerging conductive agent in recent years. Its diameter is generally about 3-5 nanometers and its length reaches 10-30 microns. It can not only act ...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/62H01M4/505H01M10/0525
CPCH01M4/1391H01M4/625H01M4/622H01M4/505H01M10/0525Y02E60/10
Inventor 舒本军
Owner 湖北中聚能源有限公司
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