Pole piece and lithium ion battery

A pole piece and pole ear technology, applied in secondary batteries, battery pack parts, non-aqueous electrolyte battery electrodes, etc., can solve the problems of poor cycle performance of lithium-ion batteries, improve charging risk, improve cycle performance, The effect of good cycle performance

Pending Publication Date: 2021-04-27
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a pole piece, which is used to solve the problem of poor cycle performance of lithium-ion batteries caused by the tab connection method

Method used

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  • Pole piece and lithium ion battery
  • Pole piece and lithium ion battery
  • Pole piece and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The pole piece provided by this embodiment is a positive pole piece, and the front view of its structure is as follows image 3 As shown, the top view is as Figure 4 As shown, the left view is as Figure 1c shown, where:

[0049] The current collector is aluminum foil with a width of 79mm;

[0050] The first groove has a width of 79mm and a length of 15mm;

[0051] The second groove has a width of 25mm and a length of 10mm;

[0052] The thickness of the first active layer is 10 μm, and the thickness of the second active layer is 80 μm;

[0053] The material used for the first active layer is a high-viscosity substance, including lithium cobaltate, conductive carbon, and polyvinylidene fluoride, wherein the molecular weight of polyvinylidene fluoride is 800,000, and the mass of polyvinylidene fluoride is the total mass of the first active layer 20% of.

Embodiment 2

[0055] The pole piece provided by this embodiment is a negative pole piece, and the front view of its structure is as follows Figure 2a As shown, the top view is as Figure 4 As shown, the left view is as Figure 1c shown, where:

[0056] The current collector is copper foil with a width of 81mm;

[0057] The first groove has a width of 81mm and a length of 50mm;

[0058] The second groove has a width of 25mm and a length of 10mm;

[0059] The thickness of the first active layer is 50 μm, and the thickness of the second active layer is 50 μm;

[0060] The active material used in the second active layer is graphite, the average particle size of graphite is 15 μm, and the degree of graphitization is 94%.

Embodiment 3

[0062] The pole piece provided by this embodiment is a negative pole piece, and the front view of its structure is as follows image 3 As shown, the top view is shown in Figure 4, and the left view is shown in Figure 1c shown, where:

[0063] The current collector is copper foil with a width of 81mm;

[0064] The first groove has a width of 81mm and a length of 50mm;

[0065] The second groove has a width of 25mm and a length of 10mm;

[0066] The thickness of the first active layer is 30 μm, and the thickness of the second active layer is 70 μm;

[0067] The active material used in the second active layer is graphite, the average particle size of graphite is 15 μm, and the degree of graphitization is 94%.

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Abstract

The invention provides a pole piece and a lithium ion battery. The first aspect of the invention provides the pole piece, the pole piece comprises a current collector, a first active layer and a second active layer, the first active layer is arranged on the surface of the current collector and is provided with a first groove, the second active layer is divided into a first part arranged in the first groove and a second part arranged on the surface, far from the current collector, of the first active layer; and the first part is provided with a second groove, the tab is arranged at the second groove and is electrically connected with the current collector, and the thickness of the first part of the second active layer is smaller than the total thickness of the first part of the first active layer and the second part of the second active layer. According to the pole piece provided by the invention, by reducing the thickness of the active layer near the tab, the charging risk of the tab connection position is improved to a certain extent, and the cycle performance of the lithium ion battery is improved.

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 advent of the 5G era, the status of lithium-ion batteries is becoming more and more important. At present, lithium-ion batteries are constantly developing in the direction of high energy density and high fast charging rate. At present, the method of adjusting the connection position of the tab from the edge of the pole piece to the middle of the side of the pole piece is used to reduce the impedance of the lithium-ion battery. [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 solve the problem of poor cycle performance of lithium-ion batteries caused by this tab connection meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0525H01M50/536
CPCH01M4/13H01M10/0525Y02E60/10H01M4/139H01M4/621H01M4/70H01M4/131H01M4/622H01M4/133H01M10/052H01M10/0585H01M4/04H01M4/02H01M4/661H01M4/66H01M2004/027H01M4/64H01M4/0404H01M4/625H01M2004/021H01M4/525
Inventor 孙雷明张健张双虎彭冲
Owner ZHUHAI COSMX BATTERY CO LTD
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