Porous separator and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-12412960-B2
Application number	US-202418647568-A
Country	US
Kind code	B2
Filing date	Apr 26, 2024
Priority date	Oct 12, 2018
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

The present invention relates to a porous separator comprising a porous layer containing a plurality of plate-type inorganic particles and a first binder polymer positioned on part or all of the surface of the plate-type inorganic particles to connect and fix between the plate-type inorganic particles; and a metal layer formed on any one surface of the porous layer, and a lithium secondary battery comprising the same.

First claim

The invention claimed is:

1. A porous separator comprising:
a porous layer consisting of a plurality of plate-shaped inorganic particles and a first binder polymer positioned on a part or all of a surface of the plate-shaped inorganic particles to connect and fix between the plate-shaped inorganic particles; and
a metal layer disposed on a surface of the porous layer,
wherein the porous separator does not include a polymer other than the first binder polymer.

2. The porous separator according to claim 1 , further comprising a ceramic coating layer disposed on another surface of the porous layer which is opposite to the surface on which the metal layer is disposed.

3. The porous separator according to claim 2 , wherein the ceramic coating layer has a dielectric constant of 20 to 1000.

4. The porous separator according to claim 2 , wherein the ceramic coating layer includes at least one inorganic particle selected from the group consisting of HfO 2 , ZrO 2 , BaSrTiO 3 , and PbLaZrTiO 3 .

5. The porous separator according to claim 2 , wherein the ceramic coating layer includes HfO 2 .

6. The porous separator according to claim 2 , wherein the ceramic coating layer includes ZrO 2 .

7. The porous separator according to claim 2 , wherein the ceramic coating layer includes BaSrTiO 3 .

8. The porous separator according to claim 2 , wherein the ceramic coating layer includes PbLaZrTiO 3 .

9. The porous separator according to claim 1 , wherein the plate-type inorganic particles comprise alumina, silica, zirconia, titanium dioxide, magnesia, ceria, yttrium oxide, zinc oxide, iron oxide, barium titanium oxide, alumina-silica composite oxide, or a mixture of two or more thereof.

10. The porous separator according to claim 1 , wherein an aspect ratio of the plate-type inorganic particles is 5 to 100.

11. The porous separator according to claim 1 , wherein an aspect ratio of the plate-type inorganic particles is 50 to 100.

12. The porous separator according to claim 1 , wherein the metal layer contains metal (M) capable of reacting with lithium to form an alloy of Lix, M wherein x is 1 to 2.25.

13. The porous separator according to claim 1 , wherein the metal layer contains at least one metal selected from the group consisting of Al, In, Au, Ni, and Mg.

14. The porous separator according to claim 1 , wherein the metal layer has a thickness of 0.01 to 1 μm.

15. A lithium secondary battery comprising a positive electrode, a negative electrode, and the porous separator of claim 1 interposed between the positive electrode and the negative electrode.

16. The lithium secondary battery according to claim 15 , wherein the negative electrode and the metal layer of the porous separator are in contact with each other.

17. The lithium secondary battery according to claim 15 , wherein the lithium secondary battery comprises lithium metal or lithium alloy in the negative electrode.

18. The porous separator according to claim 1 , wherein a weight of the first binder polymer relative to a total weight of the porous layer is 0.1 to 30% by weight.

19. A porous separator comprising: a porous layer consisting of a plurality of plate-shaped inorganic particles, a plurality of spherical inorganic particles and a first binder polymer positioned on a part or all of a surface of the plate-shaped inorganic particles to connect and fix between the plate-shaped inorganic particles; and
a metal layer disposed on a surface of the porous layer,
wherein the porous separator does not include a polymer other than the first binder polymer.

Assignees

• Lg Energy Solution Ltd

Inventors

• Choi Woongchul
• Choi Junghun
• Kang Yonghee
• Jang Minchul
• Youn Suk Il
• Son Byoungkuk

Classifications

• H01M50/491

  Porosity · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/405

  Alloys based on lithium · CPC title

• H01M4/382 Primary

  Lithium (H01M4/405 takes precedence) · CPC title