Lithium ion battery positive plate, preparation method thereof and lithium ion battery

A technology for lithium-ion batteries and positive plates, applied in battery electrodes, non-aqueous electrolyte battery electrodes, positive electrodes, etc., can solve the problem of reducing the energy density of the battery cell, uneven distribution of the current density, and lithium separation at the edge of the battery cell and the ear. question

Active Publication Date: 2020-10-23
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current density distribution of traditional winding lithium-ion batteries is uneven, especially at the edge of the battery pole piece and the current density near the tabs gradually increases. The problem of lithium analysis at the pole ear
At present, the industry mainly reduces the risk of lithium precipitation by increasing the CB value of the positive and negative elec...

Method used

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  • Lithium ion battery positive plate, preparation method thereof and lithium ion battery
  • Lithium ion battery positive plate, preparation method thereof and lithium ion battery
  • Lithium ion battery positive plate, preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The present embodiment provides a kind of lithium-ion battery positive plate, such as Figure 1-Figure 3 As shown, the active material layer is coated on the A surface and the C surface (that is, the front and back surfaces) of the current collector. It consists of an unthinned area 2 connected to the thinned area 1 (located between the thinned areas at the edges of both sides), and the areal density of the active material in the thinned area 1 is less than that of the active material in the un-thinned area 2; The thin area 1 gradually widens along the length direction of the current collector, and its widest point is located at the end of the current collector close to the tab.

[0040] Wherein, the widths of the active material layers of the A surface and the C surface are both L5, and the width of the widest part of the thinned area is L2, L2 / L5=0.05; the surface density of the active material in the non-thinned area 2 is ρ1, reduced The surface density of the activ...

Embodiment 2

[0045] The difference between the positive electrode sheet and its preparation method and the lithium ion battery provided in this example and that of Example 1 is that L2 / L5=0.1 is controlled; other conditions are the same as those of Example 1.

Embodiment 3

[0047] The difference between the positive electrode sheet and its preparation method and the lithium ion battery provided in this example and that of Example 1 is that ρ2 / ρ1=0.9 is controlled; other conditions are the same as those of Example 1.

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Abstract

The invention provides a lithium ion battery positive plate, a preparation method thereof and a lithium ion battery. The lithium ion battery positive plate comprises a current collector and an activematerial layer coated on at least one surface of the current collector, the active material layer is composed of thinning areas located on the edges of the two sides of the surface of the current collector and non-thinning areas connected with the thinning areas on the edges of the two sides, and the surface density of the active material of the thinning areas is smaller than that of the active material of the non-thinning areas. The thinning area is gradually widened along the length direction of the current collector; and the widest part of the thinning area is positioned at one end of the current collector close to the tab. According to the invention, the problem of lithium precipitation at the edge and tabs of the battery cell can be effectively relieved while the energy density of thepositive plate is not greatly reduced.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a lithium-ion battery positive plate, a preparation method thereof, and a lithium-ion battery. Background technique [0002] With the advent of the electronic age, portable power sources have been applied to all aspects of life. At present, on the basis of meeting the energy density, lithium-ion batteries with more and more efficient charging capabilities have become more and more demanded products in the market. The winding lithium-ion battery is characterized by combining the positive and negative electrodes by winding, which has the advantages of high production efficiency and low cost, and has become one of the commonly used battery types at present. However, the current density distribution of traditional winding lithium-ion batteries is uneven, especially at the edge of the battery pole piece and the current density near the tabs gradually increases. The problem of lithium analysi...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M2/26H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525H01M2004/028Y02E60/10
Inventor 韦世超彭冲李俊义徐廷铭
Owner ZHUHAI COSMX BATTERY CO LTD
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