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Positive pole piece and preparation method and application thereof

A technology of positive pole piece and positive current collector, which is applied in the field of positive pole piece and its preparation, can solve the problems of lithium-ion battery safety hazards, low safety, and internal short circuit, so as to reduce internal short circuit phenomenon, improve safety, and energy The effect of less density loss

Active Publication Date: 2020-11-06
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of the acupuncture experiment, it is easy to trigger the internal short circuit phenomenon caused by the contact between the positive electrode aluminum foil and the negative electrode active material layer, and then cause thermal runaway, which means that there is a safety hazard in the lithium ion battery in the acupuncture experiment. Explain that the safety of the lithium-ion battery in the prior art is lower

Method used

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  • Positive pole piece and preparation method and application thereof
  • Positive pole piece and preparation method and application thereof

Examples

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preparation example Construction

[0040] The present invention also provides a method for preparing the above-mentioned positive pole piece, the method comprising the following steps:

[0041] Prepare a positive electrode slurry including a positive electrode active material, the ratio [003] / [006] of the diffraction intensity [003] of the 003 crystal plane to the diffraction intensity [006] of the 006 crystal plane of the positive electrode active material in X-rays is less than 20;

[0042] The positive electrode sheet is prepared by coating the positive electrode slurry on the positive electrode current collector through a coating device, drying, cutting, and sheeting.

[0043] According to the present invention, described method specifically comprises the following steps:

[0044] (1-1) Prepare the first positive electrode slurry including the first positive electrode active material, wherein the diffraction intensity [003] of the first positive electrode active material in the X-ray of the 003 crystal plan...

Embodiment 1

[0061] (1) Preparation of positive electrode sheet

[0062] (1-1) Preparation of the first positive electrode slurry

[0063] 88wt% of the first positive electrode active material (median particle diameter D 50 Lithium cobalt oxide LiCoO with a layered structure of 4-6 μm 2 , and the ratio [003] / [006] of the diffraction intensity [003] of the first positive electrode active material in the first positive electrode active material layer in the X-ray to the diffraction intensity [006] of the 006 crystal plane is: 2.82), 1.2wt% of the first conductive agent (conductive carbon black) and 10.8wt% of the first binder (polyvinylidene fluoride) were mixed, and then N-methylpyrrolidone was added to stir and disperse to make the first positive electrode slurry.

[0064] (1-2) Preparation of the second positive electrode slurry

[0065] 97.8wt% of the first positive electrode active material (median particle diameter D 50 Lithium cobalt oxide LiCoO with a layered structure of 5-20 μ...

Embodiment 2

[0074] Others are the same as in Example 1, except that the ratio of the diffraction intensity [003] of the first positive electrode active material in the first positive electrode active material layer to the diffraction intensity [006] of the 006 crystal plane in X-rays [ 003] / [006] is 4.30.

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Abstract

The invention provides a positive pole piece and a preparation method and application thereof. The surface of the positive electrode current collector is coated with the lithium cobalt oxide positiveelectrode active material containing small particles as the first positive electrode active material layer in a double-layer coating manner, and the use of the first positive electrode active materiallayer can effectively improve the needling passing rate of the high-voltage system battery cell; the double-layer coating method is simple in process, secondary coating is not needed, and the production time can be saved; according to the method, on the premise that the needling safety is greatly improved, the energy density loss is smaller than 2%.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a positive pole piece and its preparation method and application. The use of the positive pole piece can improve the safety of the high voltage system of the lithium ion battery. Background technique [0002] Since the commercialization of lithium-ion batteries, they have been widely used as power sources for various mobile devices due to their high energy density, high power density, good cycle performance, no memory effect, and environmental protection. With the large-scale application of lithium-ion batteries, battery safety issues have become increasingly prominent. [0003] Currently, the positive electrode of a lithium-ion battery includes an aluminum foil and a positive active material layer, and the negative electrode includes a copper foil and a negative active material layer. When testing the safety of lithium-ion batteries, acupuncture experiments are of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/13H01M4/525H01M10/0525
CPCH01M4/364H01M4/366H01M4/525H01M4/13H01M10/0525H01M2004/028Y02E60/10
Inventor 谢孔岩彭冲李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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