Porous current collector and preparation method thereof, lithium negative electrode and lithium ion battery

A technology of porous current collector and porous skeleton, which is applied in the field of lithium ion battery, porous current collector and its preparation, and lithium negative electrode. It can solve the problem of low lithium affinity of porous skeleton, reduce the generation probability, and reduce the nucleation overpotential , Improve the effect of specific surface area

Pending Publication Date: 2021-03-05
GUANGZHOU AUTOMOBILE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of low lithium affinity in the existing porous framework, the present invention provides a porous current collector and a preparation method thereof, a lithium negative electrode, and a lithium ion battery

Method used

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  • Porous current collector and preparation method thereof, lithium negative electrode and lithium ion battery
  • Porous current collector and preparation method thereof, lithium negative electrode and lithium ion battery
  • Porous current collector and preparation method thereof, lithium negative electrode and lithium ion battery

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preparation example Construction

[0048] Another embodiment of the present invention provides a method for preparing a porous current collector as described above, comprising the following steps:

[0049] Electroplating: the conductive porous skeleton is placed in a copper salt solution, the conductive porous skeleton is used as the cathode for electroplating, and a copper layer is formed on the surface of the conductive porous skeleton and the inner wall of the micropore;

[0050] Heat treatment: Heat treatment is performed on the conductive porous skeleton to oxidize the copper layer to copper oxide.

[0051] In this embodiment, a copper layer is formed on the inner and outer surfaces of the conductive porous skeleton by electroplating. Compared with vapor deposition, plasma deposition, etc., the electroplating method can ensure the uniformity of the copper layer on the conductive porous skeleton, thereby The inner wall of the micropores of the conductive porous skeleton is also attached with a copper layer....

Embodiment 1

[0074] This example is used to illustrate the porous current collector disclosed in the present invention and its preparation method, including the following steps:

[0075] 1) Pretreatment of conductive porous framework.

[0076] Select foamed nickel with appropriate specifications as the conductive porous framework, with a pore volume of 75%, a pore diameter of 300 μm, and a thickness of 0.3 mm. Soak the nickel foam in 0.5 mol / L hydrochloric acid for 30 minutes, then ultrasonically clean the copper foam with acetone twice for 20 minutes, and finally dry the nickel foam in vacuum at a drying temperature of 60°C for 4 hours.

[0077] 2) The surface is copper-plated.

[0078] The electroplating solution is 0.1mol / LCuSO 4 , 0.5mol / LH 2 SO 4 mixed aqueous solution. The titanium-platinum mesh is used as the anode, and the conductive porous skeleton in step 1) is used as the cathode, and the two poles are respectively connected to the power supply, placed in the electroplating...

Embodiment 2

[0084] This example is used to illustrate the porous current collector, lithium negative electrode and preparation method thereof disclosed in the present invention, including the following steps:

[0085] 1) Pretreatment of conductive porous framework.

[0086] Select foamed nickel with appropriate specifications as the conductive porous framework, with a pore volume of 75%, a pore diameter of 300 μm, and a thickness of 0.3 mm. Soak the nickel foam in 0.5mol / L hydrochloric acid for 30 minutes, then ultrasonically clean the nickel foam with acetone twice for 20 minutes, and finally dry the nickel foam in vacuum at a drying temperature of 60°C for 4 hours.

[0087] 2) The surface is copper-plated.

[0088] The electroplating solution is 0.1mol / LCuSO 4 , 0.5mol / LH 2 SO 4mixed aqueous solution. The titanium-platinum mesh is used as the anode, and the conductive porous skeleton in step 1) is used as the cathode, and the two poles are respectively connected to the power supply...

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Abstract

In order to overcome the problem of low lithium affinity of an existing porous skeleton, the invention provides a porous current collector. The current collector comprises a conductive porous skeleton, a plurality of micropores are formed in the conductive porous skeleton, and copper oxide layers are formed on the surface of the conductive porous skeleton and the inner walls of the micropores. Meanwhile, the invention also discloses a preparation method of the porous current collector, a lithium negative electrode and a lithium ion battery. According to the porous current collector provided bythe invention, the specific surface area of the conductive porous skeleton is increased, and meanwhile, the nucleation overpotential of lithium deposition is effectively reduced, so that lithium is uniformly deposited on the surfaces of micropores of the conductive porous skeleton in the embedding process, and the generation probability of lithium dendrites is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a porous current collector and a preparation method thereof, a lithium negative electrode, and a lithium ion battery. Background technique [0002] With the popularization of energy storage base stations, electric vehicles and portable electronic products in daily life, people's demand for energy storage devices with high safety, high energy density and long life is increasing, which largely depends on positive energy in lithium-ion batteries. Further development of negative electrode materials. Among the negative electrode materials of many lithium-ion batteries, lithium metal is due to its ultra-high mass specific energy (3860mAh g -1 ) and the lowest voltage platform (-3.04V vs SHE), becoming the next-generation lithium-ion battery anode material with the most potential to replace traditional carbon materials. However, there are still huge obstacles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80H01M4/134H01M10/0525
CPCH01M4/667H01M4/80H01M4/134H01M10/0525H01M2004/027Y02E60/10
Inventor 胡志鹏史刘嵘洪晔长世勇董海勇胡倩倩
Owner GUANGZHOU AUTOMOBILE GROUP CO LTD
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