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Positive plate with special-shaped structure and lithium ion battery comprising positive plate

A positive electrode, positive electrode technology, applied in positive electrodes, structural parts, battery electrodes, etc., can solve problems such as safety hazards, and achieve the effects of improving safety, solving the problem of surface lithium deposition, and reducing polarization

Active Publication Date: 2020-11-20
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the deficiencies of the prior art, the present invention provides a positive electrode sheet with a special-shaped structure and a lithium-ion battery including the positive electrode sheet. The use of the positive electrode sheet can solve the problem of lithium deposition on the surface of the negative electrode sheet near the negative electrode tab and the formation of lithium dendrites. , causing safety hazards

Method used

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  • Positive plate with special-shaped structure and lithium ion battery comprising positive plate
  • Positive plate with special-shaped structure and lithium ion battery comprising positive plate
  • Positive plate with special-shaped structure and lithium ion battery comprising positive plate

Examples

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preparation example Construction

[0080]

[0081] The present invention also provides a method for preparing the above-mentioned positive electrode sheet, the method comprising the following steps:

[0082] 1) respectively preparing the slurry for forming the first positive electrode active material layer and the slurry for forming the second positive electrode active material layer;

[0083] 2) along the length direction of the positive electrode current collector, set an empty foil area and a coating area on the surface of the positive electrode current collector in turn, and use a double coater to form the slurry of the first positive electrode active material layer and form the second positive electrode active material layer. The slurry is coated on the coating area on the surface of the positive electrode current collector, and the thickness of the first positive electrode active material layer near the empty foil area gradually becomes thicker, and the thickness of the second positive electrode active m...

Embodiment 1

[0119] (1-1) Preparation of the first positive electrode active material slurry: the first positive electrode active material, the first conductive agent and the first binder are added into the stirring tank according to the mass ratio of 97.2:1.5:1.3, according to the known ingredients In the process, NMP solvent is added to prepare the first positive electrode active material slurry, and the solid content of the positive electrode slurry is 70% to 75%;

[0120] (1-2) Preparation of the second positive electrode active material slurry: add the second positive electrode active material, the second conductive agent and the second binder into the stirring tank according to the mass ratio of 97.2:1.5:1.3, according to the known ingredients In the process, NMP solvent is added to prepare the second positive electrode active material slurry, and the solid content of the positive electrode slurry is 70% to 75%;

[0121] (1-3) Preparation of negative electrode active material slurry:...

Embodiment 2-19

[0129] The preparation of the batteries of Examples 2-19 is the same as that of Example 1, except that the compositions of the first positive active material and the second positive active material are different, the particle diameters of the first positive active material and the second positive active material are different, and the The content of the conductive agent in the first positive active material layer and the second positive active material layer is different, as shown in Table 1.

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Abstract

The invention provides a positive plate with a special-shaped structure and a lithium ion battery comprising the positive plate. The positive plate comprises a positive current collector, a first positive active material layer and a second positive active material layer; the second positive active material layer is arranged on the surface of the positive current collector; the first positive active material layer is arranged on the surface of the second positive active material layer; and a positive electrode tab is arranged on the surface of the positive plate. In the length direction of thepositive electrode current collector, at a position close to the positive electrode tab, the thickness of the first positive electrode active material layer is gradually increased, and the thickness of the second positive electrode active material layer is gradually reduced; at a position far away from the positive electrode tab, the thickness of the first positive electrode active material layeris gradually reduced, and the thickness of the second positive electrode active material layer is gradually increased. Lithium is separated out from the surface of a negative plate near a negative electrode tab to form lithium dendrites, and potential safety hazards are brought about. With the positive plate adopted, the above problem can be solved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive electrode sheet with a special-shaped structure and a lithium ion battery including the positive electrode sheet. The positive electrode sheet can solve the problem of lithium deposition on the surface of the negative electrode sheet near the negative electrode tab. Background technique [0002] With the advent of the 5G era and the rapid development of lithium-ion battery technology, people have put forward higher requirements for the rapid charging capability and charge-discharge rate of lithium-ion batteries. The conventional in-in wound lithium-ion battery structure has been unable to meet the needs of fast charging, so developers began to move the tabs to 3 / 4, 1 / 3, 1 / 2, etc. of the positive and negative plates. In this way, the internal resistance of the cell is reduced, the polarization is reduced, the distribution of the current density...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/70H01M10/0525H01M4/02H01M4/13
CPCH01M4/70H01M10/0525H01M4/13H01M2004/028H01M2004/025Y02E60/10
Inventor 张保海彭冲曾佳贺伟石越李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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