A positive electrode sheet, preparation method and lithium ion battery comprising the same

A positive electrode sheet and a positive electrode current collector technology are applied in the field of a positive electrode sheet, a preparation method and a lithium ion battery including the same, to achieve the effects of improving cycle life, increasing energy density, and increasing compaction density

Active Publication Date: 2021-10-26
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The positive electrode sheet is mainly used to solve the problem of lithium analysis in the single-sided coating area of ​​the negative electrode of the battery cell with a winding structure during the long cycle process under the high-rate fast charging system

Method used

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  • A positive electrode sheet, preparation method and lithium ion battery comprising the same
  • A positive electrode sheet, preparation method and lithium ion battery comprising the same
  • A positive electrode sheet, preparation method and lithium ion battery comprising the same

Examples

Experimental program
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Effect test

preparation example Construction

[0084] The preparation method of above-mentioned negative plate, described method comprises the steps:

[0085] 1) respectively preparing and forming the slurry forming the negative electrode active material layer;

[0086] 2) Using a coating machine, coating the slurry forming the negative electrode active material layer on both surfaces of the negative electrode current collector to prepare the negative electrode sheet.

[0087] Wherein, in step 1), the solid content of the slurry forming the negative electrode active material layer is 40wt%-45wt%.

[0088] The present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of pro...

Embodiment 1

[0093] The first step: prepare the slurry for forming the first positive electrode active material layer: mix the first positive electrode active material (lithium cobaltate), the first conductive agent (conductive carbon black) and the first binder (PVDF) according to 97.2:1.5 : The mass ratio of 1.3 is added to the stirring tank, NMP is added to be mixed with the slurry forming the first positive electrode active material layer, and the solid content of the positive electrode slurry is 70wt%~75wt%; wherein, the particle diameter of the first positive electrode active material The distribution is: 5μm10 50 90 <45μm;

[0094] The second step: prepare the slurry forming the second positive electrode active material layer: mix the second positive electrode active material (lithium cobaltate), the second conductive agent (conductive carbon black) and the second binder (PVDF) according to 97.2:1.5 : The mass ratio of 1.3 is added to the stirring tank, NMP is added to be mixed with...

Embodiment 2-3 and comparative example 1-2

[0103] The other operating steps are the same as in Example 1, except that the thicknesses of the first positive electrode active material layer and the second positive electrode active material layer in the single-sided coating area and the double-sided coating area are different, as shown in Table 1.

[0104] The structural parameters of the positive electrode sheet of table 1 embodiment 1-3 and comparative example 1-2

[0105]

[0106] In Table 1, the thickness before " / " represents the thickness of the first positive electrode active material layer, and the thickness after " / " represents the thickness of the second positive electrode active material layer; taking 5 μm / 75 μm as an example, the thickness of the second coating layer The thickness of the first positive electrode active material layer was 5 μm, and the thickness of the second positive electrode active material layer in the second coating layer was 75 μm.

[0107] The positive electrode sheets prepared in eac...

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Abstract

The invention provides a positive electrode sheet, a preparation method and a lithium ion battery containing the same. The positive electrode sheet includes a positive electrode current collector, and the positive electrode current collector includes a single-side coating area and a double-side coating area; in the single-side coating area, a first coating layer is provided on one side of the positive electrode current collector, and the first A coating layer includes a first positive electrode active material layer and a second positive electrode active material layer, the second positive electrode active material layer is arranged on the surface of the positive electrode current collector, and the first positive electrode active material layer is arranged on the second positive electrode active material layer surface. The lithium-ion battery comprising the positive electrode sheet has the following effects: it can effectively improve the problem of lithium analysis in the single-sided coating area of ​​the negative electrode of the conventional winding structure of the lithium-ion battery, improve the cycle life of the lithium-ion battery, and reduce the cycle expansion of the lithium-ion battery . Under the premise of not reducing the fast charging performance of the battery, the compaction of the positive electrode is improved, and the energy density of the battery cell is increased.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive electrode sheet, a preparation method and a lithium ion battery containing the same. Background technique [0002] With the rapid development of modern society, portable electronic devices (mobile phones, computers, etc.) are increasingly used. Lithium-ion batteries are widely used in portable mobile electronic device terminals because of their long cycle life and high power density. At present, it seems that fast charging lithium-ion batteries have become the main development trend of consumer lithium-ion batteries. The development of fast-charging lithium-ion battery technology has brought convenience to people, but it has also brought safety problems. Lithium-ion batteries are very likely to cause lithium-ion deposition at the negative electrode of lithium-ion batteries during long cycles under high-rate fast charging conditions, especiall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/133H01M4/1391H01M4/1393H01M10/0525H01M10/0587
CPCH01M4/131H01M4/1391H01M4/133H01M4/1393H01M10/0525H01M10/0587H01M2004/028Y02E60/10Y02P70/50H01M4/0404H01M2004/021H01M4/362H01M50/538H01M4/70
Inventor 张保海彭冲贺伟施超李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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