# US 12,183,882 B2 · Solid electrolyte membrane, method for manufacturing same, and all-solid-state battery comprising same

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- Number: US 12,183,882 B2
- Document ID: US12183882B2
- Status: Granted
- Kind: B2
- Application number: 17/058,394
- Filed: 2019-12-06
- Published: 2021-07-01
- Granted: 2024-12-31
- Earliest claimed: 2018-12-06
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Jung-Pil Lee; Sung-Joong Kang; Eun-Bee Kim; Ji-Hoon Ryu; Suk-Woo Lee
- Web page: https://patentgrep.com/patent/US12183882B2

## CPC

- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- H01M 50/414: Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M 10/052: Li-accumulators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/403: Manufacturing processes of separators, membranes or diaphragms
- H01M 50/406: Moulding; Embossing; Cutting
- H01M 50/417: Polyolefins
- H01M 50/44: Fibrous material
- 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 50/494: Tensile strength
- H01M 50/497: Ionic conductivity
- H01M 2300/0082: Organic polymers
- H01M 2300/0094: in the form of layered products, e.g. coatings
- 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 disclosure relates to a solid electrolyte membrane including a polymer electrolyte material and a porous polymer sheet which form a composite with each other in such a manner that the pores of the porous polymer sheet filled with the polymer electrolyte material, and a method for manufacturing the same. Since the porous polymer material and the solid electrolyte material form a composite with each other, it is possible to obtain a solid electrolyte membrane having excellent strength and a small thickness of 50 μm or less, and thus to improve the energy density of a battery.

## Claims

### Claim 1

A solid electrolyte membrane for a solid-state battery, comprising:
a polymer electrolyte material; and
a hydrophilic surface-modified porous polymer sheet,
wherein the hydrophilic surface-modified porous polymer sheet comprises a porous material having a plurality of pores wherein the pores are configured to be penetrated by flowable materials,
the polymer electrolyte material forms a composite with the hydrophilic surface-modified porous polymer sheet, wherein the pores of the hydrophilic surface-modified porous polymer sheet are filled with the polymer electrolyte material,
wherein the hydrophilic surface-modified porous polymer sheet further comprises an ion channel comprising perforated holes,
further wherein the polymer electrolyte material is packed in the ion channel of the hydrophilic surface-modified porous polymer sheet and the pores of the hydrophilic surface-modified porous polymer sheet,
wherein the perforated holes have a diameter of 1-500 μm,
wherein the polymer electrolyte material comprises a solid electrolyte film, wherein the solid electrolyte film is formed by drying a solvent in a composition comprising a polymer resin added to a solvated lithium salt,
wherein the hydrophilic surface-modified porous polymer sheet has an upper surface,
wherein the solid electrolyte membrane is manufactured by disposing the solid electrolyte film on the upper surface of the hydrophilic surface-modified porous polymer sheet and pressurizing it to fill the ion channels and pores of the hydrophilic surface-modified porous polymer sheet with the solid electrolyte film,
wherein the pressurization is carried out by a pressurization member, and the temperature of the pressurization member is 40° C. to 60° C.,
wherein the solid electrolyte film shows an ion conductivity of 1×10−7 S/cm or more, and wherein the solid electrolyte membrane for a solid-state battery has a tensile strength of about 500 kgf/cm2 to 2,000 kgf/cm2.

### Claim 2 (depends on 1)

The solid electrolyte membrane for a solid-state battery according to claim 1, wherein the polymer resin has a weight average molecular weight (Mw) of 5,000-5,000,000.

### Claim 3 (depends on 1)

The solid electrolyte membrane for a solid-state battery according to claim 1, wherein the hydrophilic surface-modified porous polymer sheet is a nonwoven web.

### Claim 4 (depends on 1)

The solid electrolyte membrane for a solid-state battery according to claim 1, which has a thickness of 15 μm to 90 μm.

### Claim 5 (depends on 1)

The solid electrolyte membrane for a solid-state battery according to claim 1, which has a porosity of 15% or less.

### Claim 6 (depends on 1)

The solid electrolyte membrane for a solid-state battery according to claim 1, wherein the polymer electrolyte material comprises at least one selected from the group consisting of polyalkylene carbonate-based polymer resins and polysiloxane-based polymer resins.

### Claim 7 (depends on 1)

The solid electrolyte membrane for a solid-state battery according to claim 1, wherein the hydrophilic surface-modified porous polymer sheet is a polymer film comprising a polyolefin-based polymer resin, and the polymer film has a thickness of 5 μm to 50 μm.