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Lithium ion battery cathode composite cathode, preparation method thereof, and lithium ion battery

A lithium-ion battery and composition technology, applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve the problems of insufficient dispersion, affecting the electrical performance of lithium-ion batteries, etc., to improve storage stability, Improved dispersion effect, small molecular weight effect

Inactive Publication Date: 2017-02-01
湖南三迅新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the existing lithium-ion battery negative electrode composition has insufficient dispersibility and affects the electrical performance of the lithium-ion battery, the invention provides a lithium-ion battery negative electrode composition negative electrode and a preparation method thereof and a lithium-ion battery

Method used

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  • Lithium ion battery cathode composite cathode, preparation method thereof, and lithium ion battery
  • Lithium ion battery cathode composite cathode, preparation method thereof, and lithium ion battery
  • Lithium ion battery cathode composite cathode, preparation method thereof, and lithium ion battery

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preparation example Construction

[0051] Another embodiment of the present invention discloses a method for preparing a negative electrode of a lithium ion battery, comprising the following steps:

[0052] Obtain the negative electrode slurry, the negative electrode slurry is an aqueous slurry comprising an active material that can deintercalate lithium, a conductive agent, a first thickener, a second thickener and a binding agent, and the first thickener It is a nonionic cellulose polymer, the weight average molecular weight of the first thickener is 0.1 to 300,000, and the second thickener is sodium carboxymethylcellulose or ammonium carboxymethylcellulose, so The weight average molecular weight of the second thickener is 300,000 to 2 million, and the degree of substitution is 0.6 to 1.5;

[0053] The negative electrode slurry is coated on the negative electrode current collector, baked, and rolled to obtain the negative electrode.

[0054] The operation of obtaining the negative electrode slurry may be: us...

Embodiment 1

[0064] This embodiment is used to illustrate a lithium ion battery negative electrode composition negative electrode disclosed in the present invention and its preparation method, and lithium ion battery and its preparation method, including the following steps:

[0065] 1. Preparation of positive electrode

[0066] lithium cobalt oxide LiCoO 2 1. Conductive carbon black (purchased from Swiss Temigo, the brand is super P) and polyvinylidene fluoride (purchased from Kynar, the brand is HSV900) are dispersed in N-methylpyrrolidone to form positive electrode slurry. Wherein, the weight ratio of lithium cobaltate: conductive carbon black: polyvinylidene fluoride is 97:2:1, and the solid content of the positive electrode slurry is 75%.

[0067] Coat the positive electrode slurry on the surface of an aluminum foil with a thickness of 0.016mm, then dry it at 100°C for 5 minutes, and then roll and cut to obtain the positive electrode;

[0068] 2. Preparation of negative electrode

...

Embodiment 2

[0077] This example is used to illustrate a lithium ion battery negative electrode composition negative electrode disclosed by the present invention and a preparation method thereof, a lithium ion battery and a preparation method thereof, including most of the operating steps in Example 1, the difference being:

[0078] The first thickener is methyl cellulose MC with a weight average molecular weight of 30,000, and the second thickener is sodium carboxymethyl cellulose CMC with a degree of substitution of 0.95 and a weight average molecular weight of 1.5 million.

[0079] The fabricated Li-ion battery is labeled as S2.

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Abstract

In order to solve the problem that electrical properties of a lithium ion battery are influenced by insufficient dispersibility of the existing lithium ion battery cathode composite, the invention provides a lithium ion battery cathode composite. The lithium ion battery cathode composite comprises an active material, a first thickening agent, a second thickening agent and an adhesive, wherein lithium can be removed from or embedded into the active material; the first thickening agent is a non-ionic cellulose polymer, and the weight-average molecular weight of the first thickening agent is 0.1 to 300 thousand; the second thickening agent is sodium carboxymethyl cellulose or ammonium carboxymethyl cellulose, the weight-average molecular weight of the second thickening agent is 30 to 200 thousand, and the substitution degree is 0.6 to 1.5. Meanwhile, the invention also discloses a lithium ion battery cathode, a preparation method, and a lithium ion battery comprising the cathode. According to the lithium ion battery cathode composite, the dispersing effect of a cathode active material in slurry is improved, so that related electrical properties of the lithium ion battery are improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery negative electrode composition negative electrode, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used in 3C mobile communications, computers, mobile power supplies, digital cameras and other fields for their high energy density, high cycle life, and low self-discharge performance since they were first commercialized by Sony Corporation of Japan in the 1990s. application. [0003] At present, lithium-ion batteries are generally composed of four key components: positive and negative electrodes, diaphragm and electrolyte. Each component has a very significant impact on the overall performance of the battery, especially the negative electrode. The uniformity of dispersion of each component in the negative electrode seriously affects the performance of the negative e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M10/42H01M10/0525
CPCH01M4/362H01M4/62H01M10/0525H01M10/4235Y02E60/10
Inventor 玉正日冷陈伟施汉议梁世硕
Owner 湖南三迅新能源科技有限公司
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