Method for manufacturing porous structure for lithium batteries and porous structure for lithium batteries manufactured thereby

Patent metadata

Field	Value
Publication number	US-2023061580-A1
Application number	US-202217898974-A
Country	US
Kind code	A1
Filing date	Aug 30, 2022
Priority date	Aug 31, 2021
Publication date	Mar 2, 2023
Grant date	—

Abstract

Disclosed are a method for manufacturing a porous structure for lithium batteries, a porous structure for lithium batteries manufactured thereby, an anode for lithium batteries including the porous structure for lithium batteries, and a lithium battery including the same.

First claim

What is claimed is:

1 . A method for manufacturing a porous structure for lithium batteries, the method comprising:
preparing a precursor by mixing first nanoparticles and second nanoparticles; heat-treating the precursor; and etching the second nanoparticles in the heat-treated precursor.

2 . The method of claim 1 , wherein the precursor further comprises a binder.

3 . The method of claim 2 , wherein an amount of the binder ranges from about 3 to about 50% by weight based on the total amount of the precursor.

4 . The method of claim 1 , further comprising producing a precursor sheet by calendaring the precursor, after the preparing the precursor.

5 . The method of claim 1 , wherein the first nanoparticles comprise at least one of a lithiophilic material, a conductive metal, or any combination thereof.

6 . The method of claim 5 , wherein the lithiophilic material comprises at least one of silver (Ag), zinc (Zn), gold (Au), aluminum (Al), magnesium (Mg), tin (Sn), silicon (Si), carbon (C), or any combination thereof.

7 . The method of claim 5 , wherein the conductive metal comprises at least one of copper (Cu), iron (Fe), titanium (Ti), nickel (Ni), or any combination thereof.

8 . The method of claim 1 , wherein a mass ratio of the first nanoparticles to the second nanoparticles ranges from about 1:0.3 to about 1:1.2.

9 . The method of claim 1 , wherein the second nanoparticles comprise at least one of organic nanoparticles, inorganic nanoparticles, or any combination thereof.

10 . The method of claim 9 , wherein the organic nanoparticles comprise at least one of poly(methyl methacrylate), polyethylene oxide, cellulose, polystyrene, or any combination thereof.

11 . The method of claim 9 , wherein the inorganic nanoparticles comprise at least one of silica (SiO 2 ), titania (TiO 2 ), zirconia (ZrO 2 ), alumina (Al 2 O 3 ), or any combination thereof.

12 . The method of claim 1 , wherein, in the heat-treating the precursor, the precursor is heat-treated by raising the temperature from room temperature to about 240° C. to 260° C. at a rate of about 30° C./min or less so that the first nanoparticles are welded each other.

13 . The method of claim 1 , wherein, in the etching the second nanoparticles, the heat-treated precursor is treated with an acid solution to remove the second nanoparticles.

14 . The method of claim 13 , wherein the acid solution comprises hydrofluoric acid (HF) and at least one of methyl alcohol, ethyl alcohol, isopropyl alcohol or any combination thereof.

15 . A porous structure for lithium batteries comprising first nanoparticles, wherein a porosity of the porous structure ranges from about 30% to about 90%.

16 . The porous structure of claim 15 , wherein a pore size of the porous structure ranges from about 300 nm to about 5000 nm.

17 . The porous structure of claim 15 , wherein a thickness of the porous structure ranges from about 10 μm and about 100 μm.

18 . An anode for lithium batteries comprising the porous structure of claim 15 and lithium metal disposed on the porous structure.

19 . A lithium battery comprising the anode of claim 18 .

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Kwangju Institute Of Science And Tech

Inventors

• Shin Jae Wook
• Song Jong Chang
• Ha Seong Min
• Lee Seung Jong
• Kim Won Keun
• Ryu Kyoung Han
• Eom Kwang Sup
• Song Ha Yong
• Seok Da In
• Jo Jin Hyeon

Classifications

• H01M4/661

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

• B22F9/007

  Transformation of amorphous into microcrystalline state · CPC title

• H01M4/134 Primary

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/80 Primary

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

• B22F3/11

  Making porous workpieces or articles · CPC title