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Preparation method of lithium-ion battery negative electrode

A technology for lithium ion batteries and negative electrodes, which is applied in the field of preparation of negative electrodes of lithium ion batteries, can solve the problems of limited modification effect, decreased film formation, strong cohesion of electrode slurry, etc., and achieves improved cycle performance and improved electrode strength. , to avoid adverse effects

Inactive Publication Date: 2019-11-15
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong interaction between the binder and the flocculant in the aqueous solution, the cohesion of the electrode slurry is too strong, and the film-forming property is significantly reduced. The addition amount is 5% of the total mass of flocculant and binder) to achieve a balance between the degree of physical crosslinking and film-forming properties, so the modification effect achieved is also very limited

Method used

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  • Preparation method of lithium-ion battery negative electrode
  • Preparation method of lithium-ion battery negative electrode
  • Preparation method of lithium-ion battery negative electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The lithium ion battery negative electrode preparation method of the present embodiment comprises the following steps:

[0031] 1) Weigh each raw material according to the following parts by mass:

[0032]

[0033] Wherein, the electrode active material is nano-silicon powder, the conductive agent is conductive carbon black (Super P), and the binder is polyacrylic acid (PAA).

[0034] 2) dissolving the binder in a non-aqueous polar solvent, mixing it with the electrode active material and the conductive agent to prepare the electrode slurry, which specifically includes the following steps:

[0035] S101: The binder is dissolved.

[0036] Add 15 parts of the binder PAA into the non-aqueous polar solvent nitrogen, nitrogen-dimethylformamide (DMF), stir until fully dissolved, for example, stir for 24 hours, and configure a solution with a mass fraction of about 2%.

[0037] S102: Add electrode active materials and stir the slurry.

[0038] Add 70 parts of nano-silico...

Embodiment 2

[0061] The lithium ion battery negative electrode preparation method of the present embodiment comprises the following steps:

[0062] 1) Weigh each raw material according to the following parts by mass:

[0063]

[0064] Wherein, the electrode active material is nano-silicon powder, the conductive agent is Super P, and the binder is PAA.

[0065] 2) Dissolving the binder in a non-aqueous polar solvent, mixing it evenly with the electrode active material, conductive agent and flocculant to form an electrode slurry, which specifically includes the following steps:

[0066] S101: The binder is dissolved.

[0067] Add 14.2 parts of the binder PAA into the non-aqueous polar solvent DMF, stir until fully dissolved, for example, stir for 24 hours, and configure a solution with a mass fraction of about 2%.

[0068] S102: Add electrode active materials and stir the slurry.

[0069] Add 70 parts of nano-silicon powder, an electrode active material, to the above solution, and mix ...

Embodiment 3

[0093] The lithium ion battery negative electrode preparation method of the present embodiment comprises the following steps:

[0094] 1) Weigh each raw material according to the following parts by mass:

[0095]

[0096]

[0097] Among them, the electrode active material is nano-silicon powder, the conductive agent is Super P, and the binder is acrylic acid-dopamine methacrylamide copolymer (referred to as P(AA-co-DMA )-10%); the flocculant is a DMF dispersion of ferric chloride, containing 2.3 parts of ferric chloride.

[0098] 2) Dissolving the binder in a non-aqueous polar solvent, mixing it evenly with the electrode active material, conductive agent and flocculant to form an electrode slurry, which specifically includes the following steps:

[0099] S101: The binder is dissolved.

[0100] Add binder P(AA-co-DMA)-10% 12.7 parts into DMF, stir until fully dissolved, for example, stir for 24 hours, and configure a solution with a mass fraction of about 2%. Further, ...

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Abstract

The invention relates to a preparation method of a lithium-ion battery negative electrode, belonging to the technical field of lithium-ion batteries. The method includes the following steps: preparingelectrode slurry from 60-80 parts of electrode active material, 10-20 parts of conductive agent, 8.5-20 parts of binder and 0-3 parts of flocculating agent, coating a current collector with the electrode slurry and drying the electrode slurry to obtain an electrode sheet; wetting the electrode sheet with water and drying the electrode sheet; and after rolling and cutting, carrying out third drying to obtain a lithium-ion battery negative electrode. In addition to the binder, the flocculating agent is added, and a non-aqueous polar solvent is used as a slurry dispersing agent, so that flocculation cannot occur in the mixing and coating stages, and good film-forming property is ensured. After the first drying, the electrode sheet is moistened and wetted with water, micro flocculation (i.e.physical cross-linking) occurs, and then, the second drying is carried out. Therefore, the cohesion of electrode materials is enhanced, and the cycle stability of batteries 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 negative electrode of a lithium ion battery. Background technique [0002] With the development of 3C electronic equipment and electric vehicles, lithium-ion batteries are used as their main energy storage devices, and the demand for increased energy density has never stopped. [0003] The traditional negative electrode active material of lithium ion battery is carbon material, and its theoretical specific capacity is very limited. The theoretical specific capacity of silicon and other materials as the negative electrode of lithium-ion batteries is much greater than that of carbon materials, but its volume change rate during charge and discharge is very large, and the electrodes are prone to powdering and peeling, which greatly affects the battery life. Improvements in binders in electrode slurries can alleviate this problem. [0004] An e...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/04H01M4/38H01M4/62H01M10/0525
CPCH01M4/0404H01M4/0471H01M4/1395H01M4/386H01M4/62H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 黄继军崔毅杰蒲泽一姜艳
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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