Current collector and anode electrode of lithium ion battery, and method for fabricating the same

Patent metadata

Field	Value
Publication number	US-11575118-B2
Application number	US-201916391745-A
Country	US
Kind code	B2
Filing date	Apr 23, 2019
Priority date	Mar 1, 2019
Publication date	Feb 7, 2023
Grant date	Feb 7, 2023

Abstract

A method for forming a current collector is provided. At least two carbon nanostructure reinforced copper composite substrates are provided. The at least two carbon nanostructure reinforced copper composite substrates are stacked to form a composite substrate. An active metal layer is disposed on a surface of the composite substrate to form a first a composite structure. The first composite structure is pressed to form a second composite structure. The second composite structure is annealed to form a third composite structure. The third composite structure is de-alloyed to form a porous copper composite.

First claim

What is claimed is:

1. A method for making an anode electrode of a lithium ion battery, comprising:
S10, providing at least two carbon nanostructure reinforced copper substrates, and stacking the at least two carbon nanostructure reinforced copper substrates to form a first composite substrate, wherein the at least two carbon nanostructure reinforced copper substrates comprises a copper substrate and a carbon nanostructure, and a volume fraction of the carbon nanostructure in the composite substrate is greater than or equal to 40% and less than or equal to 70%;
S20, disposing an active metal layer on a surface of the first composite substrate to form a second composite structure;
S30, pressing the second composite structure to form a third composite structure;
S40, annealing the third composite structure to form a forth composite structure; and
S50, dealloying the forth composite structure to form a porous copper composite.

2. The method of claim 1 , wherein the carbon nanostructure comprises at least one carbon nanotube film or at least one graphene film in step S10.

3. The method of claim 2 , wherein in step S30, further comprising a process of alternatively folding and pressing the third composite structure.

4. The method of claim 3 , wherein in each folding and pressing process, a thickness of the first composite structure after pressing is decreased to less than 70% of a thickness of the first composite structure after folding.

5. The method of claim 1 , wherein before step S20, further comprises a step of degreasing the first composite substrate.

6. The method of claim 1 , wherein after step S30 and before step S40, further comprises a step of trimming edges of the second composite structure.

7. The method of claim 1 , wherein the copper substrate and the carbon nanostructure are directly in contact with each other in the composite substrate in S10.

8. The method of claim 1 , wherein after step S30 and before step S40, further comprises a step of trimming edges of the second composite structure.

9. The method of claim 1 , wherein the carbon nanostructure comprises at least one carbon nanotube drawn film, the carbon nanotube drawn film comprises a plurality of carbon nanotubes, and the plurality of carbon nanotubes are joined end to end and arranged substantially along a same direction.

Assignees

• Univ Tsinghua
• Hon Hai Prec Ind Co Ltd

Inventors

• Liu Yuan-Feng
• Hou Ze-Cheng
• Chen Lu
• Zhu Lin
• Li Wen-Zhen

Classifications

• C22C1/08

  Alloys with open or closed pores · CPC title

• H01M4/667 Primary

  in the form of layers, e.g. coatings · CPC title

• H01M4/38

  of elements or alloys · CPC title

• H01M4/1393 Primary

  of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title