Lithium ion battery anode, preparation method of lithium ion battery anode and lithium ion battery

A lithium-ion battery, negative electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of shortening battery life, reducing negative electrode conductivity, and increasing battery internal resistance, achieving good conductivity and internal resistance. The effect of lowering and high stability of slurry viscosity

Active Publication Date: 2018-02-23
DONGGUAN CHUANGMING BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the current problems that adding too much CMC dispersant to the negative electrode slurry leads to a decrease in the conductivity of the negative electrode, an increase in the internal resistance of the assembled battery, and a shortened service life of the battery, the embodiment of the present invention provides a lithium ion Battery negative electrode and preparation method thereof

Method used

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  • Lithium ion battery anode, preparation method of lithium ion battery anode and lithium ion battery
  • Lithium ion battery anode, preparation method of lithium ion battery anode and lithium ion battery
  • Lithium ion battery anode, preparation method of lithium ion battery anode and lithium ion battery

Examples

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preparation example Construction

[0053] Wherein, the preparation method of the negative electrode slurry at least includes the following steps:

[0054] Step S01, dry-blending the negative electrode active material, conductive agent, binder, and dispersant to obtain a first mixed material;

[0055] Step S02, adding 30-35 wt% of the solvent into the first mixed material for wet mixing treatment, and at the same time performing the first ultrasonic dispersion treatment;

[0056] Step S03, adding 35-45 wt% of the solvent, continuing the wet mixing process under vacuum conditions, and simultaneously performing the second ultrasonic dispersion process;

[0057] Step S04, adding the rest of the solvent, continuing the wet mixing process under vacuum conditions, and at the same time performing the third ultrasonic dispersion process.

[0058] In a specific manufacturing process, the above-mentioned negative electrode slurry is prepared in a stirring tank.

[0059] In step S01, when the negative electrode active ma...

Embodiment 1

[0081] A lithium-ion battery negative electrode, comprising a copper foil current collector and a negative electrode material attached to the copper foil current collector, in terms of 100% by mass, the negative electrode material includes the following components:

[0082]

[0083] Wherein, in terms of 100% of the mass of the dispersant, the dispersant includes the following components:

[0084] Sodium Carboxymethyl Cellulose 50%;

[0085] Sodium Lauryl Sulfate 50%.

[0086] In the preparation method process of the negative electrode of the lithium ion battery, it is necessary to add deionized water accounting for 50% of the total mass of the negative electrode slurry. The specific preparation method is as follows:

[0087] Step S01, when dry-mixing the graphite, acetylene black, PTFE and dispersant in a stirred tank, control the stirring speed of the stirred tank to be 8 revolutions per minute, and stir for 10 minutes. During the whole dry-mixing process, control the tem...

Embodiment 2

[0097] A lithium-ion battery negative electrode, comprising a copper foil current collector and a negative electrode material attached to the copper foil current collector, in terms of 100% by mass, the negative electrode material includes the following components:

[0098]

[0099] Wherein, in terms of 100% of the mass of the dispersant, the dispersant includes the following components:

[0100] Sodium Carboxymethyl Cellulose 50%;

[0101] Sodium Lauryl Sulfate 50%.

[0102] The preparation method of the negative electrode of the lithium ion battery is the same as that of Example 1, so it will not be described in detail.

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Abstract

The invention provides a lithium ion battery anode, a preparation method of the lithium ion battery anode, and a lithium ion battery. The lithium ion battery anode comprises an anode current collectorand an anode material, wherein the anode material is adhered to the surface of the anode current collector; the anode material comprises an anode active material, a conductive agent, an adhesive anda dispersing agent; the dispersing agent accounts for 0.6-1.0% of the total mass of the anode material; by 100% of the mass of the dispersing agent, the dispersing agent comprises the following components: 45-55% of sodium carboxymethylcellulose and 45-50% of lauryl sodium sulfate; and the feeding ratio of the sodium carboxymethylcellulose to the lauryl sodium sulfate is greater than or equal to 0.9 and less than or equal to 1.2. A paste prepared from the anode material is stable in property and not liable to sink; when a current collector is coated by the anode material to form a anode, the phenomenon of peeling is avoided; and after the lithium ion battery is assembled, the internal resistance of the battery is reduced, and the service life of the battery is prolonged.

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, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium batteries are widely used in instrumentation, memory power supply, military, oil drilling and other fields due to their high energy, low self-discharge rate, long storage life and environmental protection. And now more and more 18650 cylindrical batteries are used in electric vehicles, so the requirements for the safety performance of lithium batteries are also getting higher and higher. [0003] The existing negative electrode slurry is mainly composed of graphite, conductive agent, dispersant (the general dispersant is sodium carboxymethyl cellulose, English name: CMC), binder and deionized water. [0004] During the preparation of lithium-ion batteries, the slurry needs to be coated on the surface of the current coll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/133H01M4/1393H01M4/364H01M4/587H01M4/628H01M10/0525Y02E60/10
Inventor 赵斯琦王洋杨俊赵悠曼乔亚非陈泽伟
Owner DONGGUAN CHUANGMING BATTERY TECH
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