# US 12,002,990 B2 · Porous separator and lithium secondary battery comprising same

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- Number: US 12,002,990 B2
- Document ID: US12002990B2
- Status: Granted
- Kind: B2
- Application number: 17/279,070
- Filed: 2019-10-11
- Published: 2022-02-17
- Granted: 2024-06-04
- Earliest claimed: 2018-10-12
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Woongchul Choi; Junghun Choi; Yonghee Kang; Minchul Jang; Suk Il Youn; Byoungkuk Son
- Web page: https://patentgrep.com/patent/US12002990B2

## CPC

- H01M 50/457: comprising three or more layers
- H01M 4/382: {Lithium (H01M4/405 takes precedence)}
- H01M 4/405: {Alloys based on lithium}
- H01M 10/052: Li-accumulators
- H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- H01M 50/431: Inorganic material
- H01M 50/434: Ceramics
- H01M 50/443: Particulate material
- H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials
- H01M 50/449: having a layered structure
- H01M 50/489: Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M 50/491: Porosity
- H01M 2004/027: {Negative electrodes}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## 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.

## Claims

### Claim 1

A porous separator comprising:
a porous layer containing 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;
a metal layer disposed on a surface of the porous layer; and
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,
wherein the porous separator does not include a polymer other than the first binder polymer, and
the ceramic coating layer includes BaSrTiO3 or PbLaZrTiO3.

### Claim 2 (depends on 1)

The porous separator according to claim 1, wherein the plate-shaped 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.

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 1)

The porous separator according to claim 1, wherein the ceramic coating layer has a dielectric constant of 20 to 1000.

### Claim 9 (depends on 1)

The porous separator according to claim 1, wherein the porous layer further contains spherical inorganic particles.

### Claim 10 (depends on 1)

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.

### Claim 11 (depends on 1)

The porous separator according to claim 1, wherein the ceramic coating layer further includes HfO2.

### Claim 12 (depends on 1)

The porous separator according to claim 1, wherein the ceramic coating layer further includes ZrO2.

### Claim 13 (depends on 1)

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.

### Claim 14 (depends on 13)

The lithium secondary battery according to claim 13, wherein the negative electrode and the metal layer of the porous separator are in contact with each other.

### Claim 15 (depends on 13)

The lithium secondary battery according to claim 13, wherein the lithium secondary battery comprises lithium metal or lithium alloy in the negative electrode.