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Current collector and application thereof

A current collector and conductive layer technology, applied in the direction of electrode carrier/current collector, structural parts, final product manufacturing, etc., can solve problems such as limiting applications, affecting the electrical performance of lithium-ion batteries, and dropping active layers

Active Publication Date: 2021-07-02
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the loaded active layer of this composite current collector is easy to fall off from the surface of the current collector during application, which seriously affects the electrical performance of lithium-ion batteries and limits its application in lithium-ion batteries.

Method used

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  • Current collector and application thereof
  • Current collector and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] The lithium ion battery of the present embodiment is obtained by the following steps:

[0085] 1) Preparation of the positive electrode fluid

[0086] First in the vacuum is 2 * 10 -4 The temperature of 30 ° C is deposited in the two functional surfaces of the insulating layer under the conditions of PA, followed by a vacuum of 2 * 10. -2 The surface deposition of the second conductive layer at a temperature of 120 ° C in the condition of PA is deposited in the surface deposition of the second conductive layer in the surface of the first conductive layer.

[0087] Wherein the material of the insulating layer is polyethylene terephthalate (PET), the thickness is 6 μm, the material of the first conductive layer is aluminum, the first conductive layer has a density of 90%, and the thickness of the first conductive layer. The material of 800 nm and the second conductive layer is aluminum, and the surface roughness of the second conductive layer is 200 nm, and the thickness of t...

Embodiment 2

[0098] The preparation method of the lithium ion battery of the present embodiment is basically the same as that of Example 1, and the only difference is:

[0099] In step 2), the positive electrode active slurry is applied to the entire surface of the second conductive layer. After 6 hours of 90-130 ° C, after the roller roller pressure, the positive electrode active layer is obtained, and the partial positive electrode active layer is removed. The surface of the dielectric layer is welded to the surface of the exposed second conductive layer to obtain a positive electrode sheet.

[0100] In step 3), the negative electrode active slurry is applied to the entire surface of the negative electrode concentration fluid. After 6 hours of 90 to 130 ° C, the roller roller is pressed, and the negative electrode active layer is obtained, and the negative electrode active layer is removed. The surface of the fluid is welded to the surface of the exposed negative electrode fluid to obtain a ...

Embodiment 3

[0103] The preparation method of the lithium ion battery of the present embodiment is basically the same as that of Example 1, and the only difference is:

[0104] In step 2), the positive electrode active slurry is uniformly applied to both surfaces of the second conductive layer of the positive electrode concentration fluid, and the partial region does not apply a positive active slurry in the width direction of the second conductive layer. The region of the positive active slurry does not apply the extreme ear, and then welded to the outer ear, resulting in a positive electrode sheet.

[0105] In step 3), the negative electrode active slurry is uniformly applied to both surfaces of the copper foil, and the negative electrode active slurry is not applied in the width direction of the copper foil, and the negative electrode active slurry is not applied. Regional die cuts the ears, and then welded to the outer ear, resulting in a negative electrode.

[0106] Figure 8 A schematic ...

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Abstract

The invention provides a current collector and application thereof. The current collector comprises an insulating layer, at least one functional surface of the insulating layer is provided with a conductive layer, and the conductive layer comprises a first part close to the insulating layer; based on the thickness of the conductive layer, the thickness of the first part is greater than or equal to 20%; the density D of the first part is larger than or equal to 50%; and the roughness of the surface, far away from the insulating layer, of the conductive layer is 50 nm to 2 microns. According to the current collector disclosed by the invention, the conductive layer with the thickness of at least 20% has relatively high density, so that the current collector has relatively low sheet resistance, and the lithium ion battery has relatively good electrical performance; and the surface, far away from the insulating layer, of the conductive layer is high in roughness, so that the adhesive force between the active layer and the conductive layer can be increased, the adhesion between the active layer and the current collector is increased, and the electrical performance of the lithium ion battery is further improved.

Description

Technical field [0001] The present invention relates to a collector and its application thereof, belonging to a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, laptops, electric vehicles and other fields. With the continuous improvement of battery capacity, more energy and fast charging capacity, people continue to challenge materials and battery design limits, thereby also make lithium-ion battery safety defects more showed. In recent years, the fire explosion accident in lithium-ion battery has caused attention to the attention of the society, which restricts further application of lithium-ion batteries. [0003] Conventional lithium-ion batteries tend to use aluminum foil as a positive electrode concentration fluid, copper foil as an negative electrode fluid. In the prior art, the three-way structural composite concentrated fluid replacement of aluminum foil and copper foil with aluminum foil-polymer layer-aluminum foi...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/66H01M10/058
CPCH01M4/13H01M4/139H01M4/667H01M10/058Y02P70/50Y02E60/10
Inventor 翟艳云张健彭冲
Owner ZHUHAI COSMX BATTERY CO LTD
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