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Pole piece and lithium ion battery

A technology of pole pieces and tabs, which is applied in secondary batteries, battery pack components, electrode carriers/collectors, etc., can solve the problems of poor cycle performance and increased current density of lithium-ion batteries, and achieve improved charging risks, Effect of improving cycle retention rate and good cycle performance

Active Publication Date: 2021-05-14
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the position of the tab is changed, the current density around the tab will increase, and as the lithium-ion battery cycles, lithium ions will be precipitated, resulting in poor cycle performance of the lithium-ion battery

Method used

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  • Pole piece and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The front view of the pole piece provided by this embodiment is as Figure 2a As shown, the top view is as image 3 As shown, the left view is as Figure 1c shown, where:

[0055] The current collector is copper foil with a width of 81mm;

[0056] The first groove has a width of 25mm and a length of 10mm;

[0057] The second groove has a width of 81 mm and a length of 30 mm.

[0058] When the pole piece is a positive pole piece, the first active layer and the second active layer include 97 parts by mass of lithium cobalt oxide, 1.5 parts by mass of PVDF and 1.5% of carbon black conductive agent of 1.5 parts by mass according to mass percentage;

[0059] When the pole sheet is a negative electrode sheet, both the first active layer and the second active layer include 97 parts by mass of graphite, 0.7 parts by mass of carbon black, 1.3 parts by mass of styrene-butadiene rubber and 1 part by mass of carboxymethyl cellulose Sodium, wherein, the average particle size of...

Embodiment 2

[0061] The front view of the pole piece provided by this embodiment is as Figure 2a As shown, the top view is as image 3 As shown, the left view is as Figure 1c shown, where:

[0062] The current collector is copper foil with a width of 81mm;

[0063] The first groove has a width of 25mm and a length of 10mm;

[0064] The second groove has a width of 81 mm and a length of 40 mm.

[0065] When the pole piece is a positive pole piece or a negative pole piece, the materials of the first active layer and the second active layer are the same as those in Example 1.

Embodiment 3

[0067] The front view of the pole piece provided by this embodiment is as Figure 2a As shown, the top view is as image 3 As shown, the left view is as Figure 1c shown, where:

[0068] The current collector is copper foil with a width of 81mm;

[0069] The first groove has a width of 25mm and a length of 10mm;

[0070] The second groove has a width of 81 mm and a length of 50 mm.

[0071] When the pole piece is a positive pole piece or a negative pole piece, the materials of the first active layer and the second active layer are the same as those in Example 1.

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Abstract

The invention provides a pole piece and a lithium ion battery. The pole piece comprises a current collector, a first active layer and a second active layer, wherein the first active layer and the second active layer are sequentially stacked on the surface of the current collector; the first active layer is provided with a first groove, the second active layer is provided with a second groove, and the vertical projection of the second groove on the current collector covers the vertical projection of the first groove on the current collector; and the tab is arranged at the first groove and is electrically connected with the current collector. According to the pole piece provided by the invention, the charging risk of the tab connection position is effectively improved, and the cycle retention rate of the lithium ion battery is improved under the condition of keeping high-rate charging.

Description

technical field [0001] The invention relates to a pole piece and a lithium ion battery, and relates to the technical field of lithium ion batteries. Background technique [0002] With the continuous development of the 5G era, the status of lithium-ion batteries is becoming more and more important, which also promotes the continuous development of lithium-ion batteries in the direction of high energy density and high fast charging rate. At present, by adjusting the connection position of the tab on the pole piece from the edge to the middle part of the side, the impedance of the lithium-ion battery is reduced and the charging speed of the lithium-ion battery is increased. [0003] However, when the position of the tab is changed, the current density around the tab will increase, and as the lithium-ion battery cycles, lithium ions will be precipitated, resulting in poor cycle performance of the lithium-ion battery. Therefore, how to improve the cycle performance of lithium-io...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/70H01M10/0525H01M50/531
CPCH01M4/13H01M10/0525H01M4/70Y02E60/10H01M2004/021H01M50/534H01M10/0585H01M10/052H01M4/133H01M50/533H01M50/536H01M4/661H01M4/64H01M4/0404H01M4/66H01M4/366H01M2004/027
Inventor 孙雷明张健张双虎彭冲
Owner ZHUHAI COSMX BATTERY CO LTD
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