Porous current collector and preparation method thereof

A technology of porous current collectors and metal substrates, applied in electrode manufacturing, electrode carriers/current collectors, electrical components, etc., can solve the problems of difficult control of hole size, influence on current collector performance, easy to tear metal foil, etc., to achieve Effect of improving surface wetting tension, low cost, and low production cost

Pending Publication Date: 2022-08-02
佛山市中技烯米新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the chemical corrosion method needs to be carried out by anodic electrolysis in an acidic solution. This method pollutes the environment greatly, the size of the holes is difficult to control, and the precision is low.
The hole size formed by the mechanical punching method is large, it is easy to tear the metal foil, the yield rate is low, and the pass is easy to have burrs, which affects the performance of the current collector

Method used

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  • Porous current collector and preparation method thereof
  • Porous current collector and preparation method thereof
  • Porous current collector and preparation method thereof

Examples

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Effect test

preparation example Construction

[0040] A preparation method of a porous current collector provided by the present application comprises the following steps:

[0041] S1. Provide metal base material;

[0042] The metal substrate of the present application is aluminum foil or copper foil, but is not limited thereto. In the present application, the thickness of the metal substrate is preferably 10 to 20 μm. In other embodiments of the present application, the thickness of the metal substrate may also be less than 10 μm or greater than 20 μm.

[0043] S2, convey the metal substrate to the extrusion roller for extrusion;

[0044] see figure 1 , the surface of the squeeze roller 1 of the present application is provided with a puncture needle 11, and the puncture needle 11 of the present application is used to pierce the metal substrate, so as to cause perforation or mechanical damage to the metal substrate.

[0045] Because the thickness of the metal substrate is very thin, after the rolled metal substrate is ...

Embodiment 1

[0067] A preparation method of a porous current collector, comprising the following steps:

[0068] S1. Provide a copper foil substrate with a thickness of 15 μm;

[0069] S2. The copper foil base material is transported to a squeezing roll for squeezing, and the squeezing roll is divided into a first squeezing roll and a second squeezing roll, wherein the first squeezing roll and the second squeezing roll are arranged in parallel, The metal substrate is transported between the first squeezing roller and the second squeezing roller for puncture treatment, and the surface of the squeezing roller is provided with a thorn with a diameter of 15 μm and a length of 16 μm;

[0070] S3. The extruded copper foil substrate is transported to a cleaning tank with a length of 1 m at a speed of 50 m / min. The cleaning tank contains an etching solution, and the etching solution includes 4 mol / L HCl and 0.6 mol / L Al2 ( SO4)3;

[0071] S4, drying the etched copper foil substrate at a drying t...

Embodiment 2

[0073] A preparation method of a porous current collector, comprising the following steps:

[0074] S1. Provide an aluminum foil substrate with a thickness of 20 μm;

[0075] S2. The aluminum foil base material is conveyed to the extrusion roller for extrusion, and the extrusion roller is divided into a first extrusion roller and a second extrusion roller, wherein the first extrusion roller and the second extrusion roller are arranged in parallel, and the metal The substrate is transported between the first squeezing roller and the second squeezing roller for puncture treatment, and the surface of the squeezing roller is provided with a needle with a diameter of 20 μm and a length of 22 μm;

[0076] S3. The extruded aluminum foil substrate is sequentially transported to the pickling tank, the alkaline cleaning tank and the etching tank, all of which are 1 m long, at a speed of 60 m / min. The pickling solution in the pickling tank includes HF and H 2 SO 4 , HF and H 2 SO 4 T...

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Abstract

The invention discloses a porous current collector and a preparation method thereof. The preparation method comprises the following steps: providing a metal substrate; the metal base material is conveyed to an extrusion roller to be extruded, and pricking needles are arranged on the surface of the extrusion roller and used for pricking the metal base material; cleaning the extruded metal base material so as to form a through hole in the metal base material; and carrying out drying treatment on the etched metal base material. The preparation method is simple to operate, the size of the through hole is adjustable, the precision is high, the porosity is adjustable, the cost is low, and the yield is high.

Description

technical field [0001] The present application relates to the technical field of lithium batteries, and in particular, to a porous current collector and a preparation method thereof. Background technique [0002] As an environmentally friendly lithium secondary battery, lithium-ion battery has been widely used in various electronic fields such as 3C field and EV field due to its high specific energy, high specific power, long cycle life, and good high and low temperature performance. Wait. [0003] Porous current collectors have a huge surface area. On the one hand, they can carry more electrode active materials, thereby increasing the capacity of the battery; on the other hand, they can provide a larger reaction interface for the electrode reaction to improve the power of the battery. [0004] The existing preparation methods of porous current collectors mainly include two methods, one is a chemical etching method, and the other is a mechanical punching method. Among them...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/80H01M4/04H01M10/0525
CPCH01M4/80H01M4/043H01M4/0471H01M10/0525Y02E60/10
Inventor 刘福海
Owner 佛山市中技烯米新材料有限公司
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