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Negative plate and lithium ion battery

A technology of negative electrode sheet and negative electrode active material, which is applied in secondary batteries, battery pack parts, non-aqueous electrolyte battery electrodes, etc., can solve the problems of poor cycle performance and increased current density of lithium ion batteries.

Active Publication Date: 2021-05-18
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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  • Negative plate and lithium ion battery
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  • Negative plate and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The front view of the negative plate 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:

[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 30mm;

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

[0059] The average particle size of the negative electrode active material in the first active layer is 18 μm, and the degree of graphitization is 96%;

[0060] The average particle diameter of the negative electrode active material in the second active layer is 15 μm, and the degree of graphitization is 92%.

[0061] The preparation method of the negative plate provided in this embodiment comprises the following steps:

[0062] 1. Dissolve the graphite of 97 parts by mass, the carbon black of 0.7 parts by mass, the styrene-butadiene rubber of 1.3 parts by mass and the sodium carboxymethyl...

Embodiment 2

[0065] The front view of the negative plate 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:

[0066] The current collector is copper foil with a width of 81mm;

[0067] The first groove has a width of 81mm and a length of 40mm;

[0068] The second groove has a width of 25mm and a length of 10mm;

[0069] The average particle size of the negative electrode active material in the first active layer is 18 μm, and the degree of graphitization is 96%;

[0070] The average particle diameter of the negative electrode active material in the second active layer is 15 μm, and the degree of graphitization is 92%.

[0071] For the preparation method of the negative electrode sheet provided in this example, reference may be made to Example 1.

Embodiment 3

[0073] The front view of the negative plate 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:

[0074] The current collector is copper foil with a width of 81mm;

[0075] The first groove has a width of 81mm and a length of 50mm;

[0076] The second groove has a width of 25mm and a length of 10mm.

[0077] The average particle size of the negative electrode active material in the first active layer is 18 μm, and the degree of graphitization is 96%;

[0078] The average particle diameter of the negative electrode active material in the second active layer is 15 μm, and the degree of graphitization is 92%.

[0079] For the preparation method of the negative electrode sheet provided in this example, reference may be made to Example 1.

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Abstract

The invention provides a negative plate and a lithium ion battery. On the first aspect, the invention provides the negative electrode plate, the negative electrode plate 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, and the second active layer is divided into a first part arranged in the first groove and a second part arranged on the surface, far away from the current collector, of the first active layer; the first part is provided with a second groove, a tab is arranged in 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 active layer and the second part of the second active layer. According to the negative plate provided by the invention, by reducing the thickness of the active layer around the tab, 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 maintaining high-rate charging.

Description

technical field [0001] The invention relates to a negative electrode sheet 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 negative electrode sheet 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 cyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0525H01M50/531
CPCH01M4/13H01M10/0525Y02E60/10
Inventor 孙雷明张健张双虎彭冲
Owner ZHUHAI COSMX BATTERY CO LTD
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