Anode for lithium metal battery, manufacturing method of the same, lithium metal battery including the same

Patent metadata

Field	Value
Publication number	US-2021408552-A1
Application number	US-202117355982-A
Country	US
Kind code	A1
Filing date	Jun 23, 2021
Priority date	Feb 28, 2020
Publication date	Dec 30, 2021
Grant date	—

Abstract

The present disclosure relates to an anode for a lithium-metal battery, a manufacturing method of the same, and a lithium-metal battery including the anode. The anode for a lithium-metal battery includes a complex hierarchical structure current collector which includes an inverted pyramid-shaped micro hole pattern and nanostructures provided within the inverted pyramid-shaped micro hole pattern; and a lithium metal which is electrodeposited on the nanostructure of the current collector. As a result, it is possible to increase the life stability of the battery and increase the coulombic efficiency.

First claim

What is claimed is:

1 . An anode for a lithium-metal battery, the anode comprising:
a complex hierarchical structure current collector which comprises an inverted pyramid-shaped micro hole pattern and nanostructures provided within the inverted pyramid-shaped micro hole pattern; and a lithium metal which is electrodeposited on the nanostructure of the current collector.

2 . The anode for a lithium-metal battery of claim 1 ,
wherein the inverted pyramid-shaped micro hole pattern is obtained by disposing a plurality of inverted pyramid-shaped micro holes at regular intervals, and wherein the inverted pyramid-shaped micro hole has a quadrangular lower surface and a quadrangular upper surface wider than the lower surface, and has a side surface having an inclined structure.

3 . The anode for a lithium-metal battery of claim 2 ,
wherein center-to-center spacing between two adjacent inverted pyramid-shaped micro holes is 100 μm, and wherein a length of one side of the upper surface of the inverted pyramid-shaped micro hole is between 40 μm to 50 μm, and a depth of the inverted pyramid-shaped micro hole is 20 μm.

4 . The anode for a lithium-metal battery of claim 3 , wherein the side surface of the inverted pyramid-shaped micro hole has an inclined structure of between 50 degrees and 60 degrees.

5 . A method for manufacturing an anode for a lithium-metal battery, the method comprising:
manufacturing a copper electrode comprising an inverted pyramid-shaped micro hole pattern; electrodepositing nanostructures on the inverted pyramid-shaped micro hole pattern; and electrodepositing a lithium metal on the nanostructures.

6 . The method of claim 5 , wherein the manufacturing the copper electrode comprising the inverted pyramid-shaped micro hole pattern comprises:
applying an oxygen plasma treated Si x N y wafer on a silicon substrate; coating a photo resistor pattern on the Si x N y wafer; removing the Si x N y wafer in a region where there is no photo resistor pattern, by performing photolithography etching; removing the photo resistor pattern; forming the inverted pyramid-shaped micro hole pattern by etching the silicon substrate of a region where there is no Si x N y wafer; depositing a composite of chromium and copper; forming a nickel mold by performing nickel plating through an electrocast; and forming the copper electrode comprising the inverted pyramid-shaped micro hole pattern by performing copper plating on the nickel mold through the electrocast.

7 . The method of claim 5 , wherein the electrodepositing nanostructures on the inverted pyramid-shaped micro hole pattern comprises:
growing the nanostructures on the copper electrode based on an electrodeposition method; removing the nanostructures overgrown outside the inverted pyramid-shaped micro hole pattern of the copper electrode; and performing mechanical polishing in order to remove the nanostructures remaining outside the inverted pyramid-shaped micro hole pattern of the copper electrode.

8 . The method of claim 7 , wherein the removing the nanostructures overgrown outside the inverted pyramid-shaped micro hole pattern of the copper electrode comprises removing the nanostructures overgrown outside the inverted pyramid-shaped micro hole pattern of the copper electrode by using a polyimide tape and a rubber roller.

9 . The method of claim 7 , wherein the growing the nanostructures on the copper electrode based on an electrodeposition method and the removing the nanostructures overgrown outside the inverted pyramid-shaped micro hole pattern of the copper electrode are performed repeatedly a plurality of number of times.

10 . The method of claim 5 , wherein the manufacturing a copper electrode comprising an inverted pyramid-shaped micro hole pattern comprises manufacturing the inverted pyramid-shaped micro hole pattern such that a plurality of inverted pyramid-shaped micro holes are disposed at regular intervals,
and wherein the inverted pyramid-shaped micro hole has a quadrangular lower surface and a quadrangular upper surface wider than the lower surface, and has a side surface having an inclined structure.

11 . The method of claim 10 ,
wherein the manufacturing a copper electrode comprising an inverted pyramid-shaped micro hole pattern comprises: manufacturing such that center-to-center spacing between two adjacent inverted pyramid-shaped micro holes is 100 μm; and manufacturing such that a length of one side of the upper surface of the inverted pyramid-shaped micro hole is between 40 μm to 50 μm, and a depth of the inverted pyramid-shaped micro hole is 20 μm.

12 . The method of claim 11 ,
wherein the manufacturing a copper electrode comprising an inverted pyramid-shaped micro hole pattern comprises manufacturing such that the side surface of the inverted pyramid-shaped micro hole has an inclined structure of between 50 degrees and 60 degrees.

13 . A lithium-metal battery which comprises the anode for the lithium-metal battery according to claim 1 .

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Seok Jae Young
• Kim San Ha
• Yang In Yeong
• Jeong Ji Hun
• Lee Seung Seob

Classifications

• H01M4/661 Primary

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

• H01M4/045

  Electrochemical coating; Electrochemical impregnation · CPC title

• H01M4/80 Primary

  Porous plates, e.g. sintered carriers · CPC title

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title

• H01M10/052

  Li-accumulators · CPC title