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Negative pole piece as well as preparation method and application thereof

A technology of negative pole pieces and ceramic particles, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., to achieve the effect of solving uneven coating and preventing uneven dense accumulation

Active Publication Date: 2020-04-10
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the present invention, by coating the surface of the negative electrode sheet with an insulating safety coating, the lithium separation of the negative electrode occurs between the safety coating and the negative electrode interface, thereby preventing the lithium dendrites from directly contacting the diaphragm, preventing the lithium dendrites from piercing through the diaphragm and causing lithium ions The problem of internal short circuit in the battery

Method used

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  • Negative pole piece as well as preparation method and application thereof
  • Negative pole piece as well as preparation method and application thereof
  • Negative pole piece as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] (1) Preparation of roughened alumina ceramics:

[0090] (a) Aluminum sulfate is mixed with water, stirred at a rotating speed of 200r / min for 5min to obtain an aluminum sulfate solution with a concentration of 0.56mol / mL;

[0091] (b) According to the mass ratio of alumina and the aluminum sulfate is 1:1, the aluminum sulfate solution and the alumina are stirred and mixed at a speed of 800r / min for 30min, filtered to remove water, and then heated in a muffle furnace at 800 Calcined at ℃ for 2 hours to obtain roughened alumina ceramics with an average particle size of 800nm;

[0092] (2) Preparation of ceramic slurry:

[0093] Mixing the roughened alumina ceramics, PVDF and NMP, the mass ratio of the roughened alumina ceramics to the binder PVDF is 97:3, to obtain a ceramic slurry with a solid content of 40%;

[0094] (3) Preparation of negative electrode active material layer:

[0095] Graphite, conductive agent SP, CMC and SBR are prepared into negative electrode ac...

Embodiment 2

[0100] The difference from Example 1 is that the mass ratio of aluminum oxide to aluminum sulfate in step (b) is 0.6:1.

Embodiment 3

[0102] The difference from Example 1 is that the mass ratio of aluminum oxide to aluminum sulfate in step (b) is 1.2:1.

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Abstract

The invention relates to a negative pole piece as well as a preparation method and application thereof. The negative pole piece comprises a current collector, and an active material layer and an insulating safety coating which are sequentially arranged on the surface of the current collector; and the insulating safety coating comprises coarsened ceramic particles. The insulating safety coating comprises the coarsened ceramic particles, the coarsened ceramic particles can be more tightly adhered to the surface of the negative electrode active substance, uneven dense accumulation of the ceramicparticles is prevented, and then the problem of uneven coating is solved; and by coating the surface of the negative pole piece with the insulating safety coating, negative lithium precipitation occurs between the safety coating and the negative interface, so that lithium dendrites are prevented from being in direct contact with the diaphragm, and internal short circuit of the lithium ion batterydue to the fact that the lithium dendrites pierce the diaphragm is prevented.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a negative pole piece, its preparation method and application. Background technique [0002] In recent years, lithium-ion batteries have attracted great attention due to their excellent characteristics such as high energy density, high output voltage, low self-discharge rate, long service life, no memory effect, and environmental friendliness. expanded, took over the dominant position. It is widely used in consumer electronics, electric tools and other mobile electronic terminal equipment. In addition, oil energy is becoming more and more scarce, China's fuel consumption requirements for automobiles are continuously decreasing, and the demand for lithium-ion batteries used in electric vehicles is also expanding. The lithium battery industry has not only developed into a mainstream industry in the field of new energy materials in my country, but also one of the the...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393H01M4/587H01M4/62H01M10/0525H01M10/42
CPCH01M4/133H01M4/1393H01M4/587H01M4/628H01M10/0525H01M10/4235H01M2004/027Y02E60/10
Inventor 夏勇亮范欣吕黠物朱坤庆夏小勇计阳
Owner 东莞维科电池有限公司
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