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Lithium-ion battery negative electrode slurry, preparation method thereof, negative electrode sheet, and lithium-ion battery

A lithium-ion battery, negative electrode slurry technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle performance, easy increase in battery impedance, easy capacity decay, etc., to improve high-temperature storage, coating Good connection effect and good coating effect

Active Publication Date: 2021-07-16
DONGGUAN CHUANGMING BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the current problems such as the large expansion of the silicon-carbon negative electrode that causes the battery to easily increase in impedance during charge and discharge, the capacity is easy to decay, and the cycle performance is poor, the invention provides a lithium-ion battery negative electrode slurry and a preparation method thereof

Method used

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  • Lithium-ion battery negative electrode slurry, preparation method thereof, negative electrode sheet, and lithium-ion battery
  • Lithium-ion battery negative electrode slurry, preparation method thereof, negative electrode sheet, and lithium-ion battery
  • Lithium-ion battery negative electrode slurry, preparation method thereof, negative electrode sheet, and lithium-ion battery

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preparation example Construction

[0041] In one embodiment, the preparation method of the lithium ion battery negative electrode slurry at least includes the following steps:

[0042] Step S01. Weighing the above-mentioned negative electrode active material, conductive agent, binder, thickener, deionized water;

[0043] Step S02. Mix the weighed negative electrode active material, conductive agent, thickener, and part of deionized water to obtain a first slurry;

[0044]Step S03. Mix the remaining deionized water with the first slurry, adjust the viscosity, add the weighed binder, and continue stirring until the slurry is uniform to obtain a second slurry;

[0045] Step S04. Vacuumize and stir the second slurry obtained in step S03 to obtain negative electrode slurry.

[0046] The preparation method of the lithium-ion battery negative electrode slurry will be further explained below.

[0047] In a specific manufacturing process, the preparation of the above-mentioned lithium-ion battery negative electrode sl...

Embodiment 1

[0069] A lithium-ion battery negative electrode slurry, a preparation method thereof, a negative electrode sheet, and a lithium-ion battery.

[0070] Among them, the lithium-ion battery negative electrode slurry contains silicon carbon materials, Super P (D50 is about 1 μm), SBR (elastic modulus is 1.25MPa), CMC and deionized water;

[0071] Specifically, 94.5g of silicon carbon material, 2g of Super P, 2g of SBR, 1.5g of CMC, and 113g of deionized water.

[0072] The preparation method of the lithium ion battery negative electrode slurry is as follows:

[0073] Step S11. Weighing the above-mentioned negative electrode active material, conductive agent, binder, thickener, deionized water;

[0074] Step S12. Mix the weighed negative electrode active material, conductive agent, thickener, and 45g of deionized water, first stir at a stirring speed of 20r / min for 10min, premix the materials, and then mix them at 50r / min The stirring speed of min was stirred for 30min to obtain t...

Embodiment 2

[0086] A lithium-ion battery negative electrode slurry, a preparation method thereof, a negative electrode sheet, and a lithium-ion battery.

[0087] Among them, the lithium-ion battery negative electrode slurry contains silicon carbon material, Super P conductive agent (D50 is about 1 μm), SBR (elastic modulus is 2.5MPa), CMC and deionized water;

[0088] Specifically, 94.5g of silicon carbon material, 2g of Super P, 2g of SBR, 1.5g of CMC, and 113g of deionized water.

[0089] The preparation method of the lithium ion battery negative electrode slurry is as follows:

[0090] Step S21. Weighing the above-mentioned negative electrode active material, conductive agent, binder, thickener, deionized water;

[0091] Step S22. Mix the weighed negative electrode active material, conductive agent, thickener, and 45g of deionized water, first stir at a stirring speed of 20r / min for 10min, premix the materials, and then mix them at 50r / min The stirring speed of min was stirred for 30...

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Abstract

The invention relates to the technical field of lithium-ion batteries, and specifically provides a lithium-ion battery negative electrode slurry, a preparation method thereof, a negative electrode sheet, and a lithium-ion battery. The negative electrode slurry of the lithium ion battery comprises a negative electrode active material, a conductive agent, a binding agent, a thickener and deionized water, wherein the negative electrode active material is a silicon-based material; the D50 particle diameter of the conductive agent is (0.05~5 ) μm; the binder is styrene-butadiene rubber, and the modulus of elasticity of styrene-butadiene rubber is (1.25-5.0) MPa. In the present invention, the styrene-butadiene rubber with a specific elastic modulus and the conductive agent with a specific D50 particle size make the lithium-ion battery negative electrode slurry exhibit a very high elastic effect when it is coated to form a negative electrode sheet, and can effectively inhibit the expansion of silicon-based materials. Further inhibit the destruction of the SEI film, thereby improving the electrochemical performance of the battery such as high-temperature storage, cycle performance, and high-rate charge and discharge.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery negative electrode slurry, a preparation method thereof, a negative electrode sheet and a lithium ion battery. Background technique [0002] Lithium-ion batteries are composed of positive electrodes, negative electrodes, diaphragms, and battery cases. Because of their high energy, low self-discharge rate, long storage life, and environmental protection, they are widely used in instrumentation, memory power, military, oil drilling, and other fields. [0003] Silicon-containing graphite negative electrode (SiO x or SiC x , that is, silicon, silicon carbon, silicon oxygen, etc.) has become the material of choice for manufacturers to increase the energy density of commercial lithium-ion batteries because of their high capacity. The process is blocked. [0004] Specifically, the following problems occur during the expansion of silicon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M4/131H01M4/134H01M10/0525
CPCH01M4/131H01M4/134H01M4/362H01M4/386H01M4/483H01M4/62H01M4/621H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 卢阳璇赵悠曼
Owner DONGGUAN CHUANGMING BATTERY TECH
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