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A positive electrode sheet and its preparation method and application

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, internal short circuit, etc., and achieve improved acupuncture pass rate, improved safety performance, The effect of improving security

Active Publication Date: 2022-05-13
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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  • A positive electrode sheet and its preparation method and application
  • A positive electrode sheet and its preparation method and application

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 present invention provides a positive electrode sheet and its preparation method and application. The present invention is to coat the positive electrode active material containing small particles of lithium cobaltate on the surface of the positive electrode current collector by means of double-layer coating as the first positive electrode active material layer , the use of the first positive electrode active material layer can effectively improve the acupuncture pass rate of high-voltage system batteries; the double-layer coating method of the present invention is simple in process, does not require secondary coating, and can save production time; the present invention Under the premise of greatly improving the safety of acupuncture, the energy density loss is less 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 Patents(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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