# US 2021/0242446 A1 · All-solid-state battery using lithium metal for negative electrode

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- Number: US 2021/0242446 A1
- Document ID: US20210242446A1
- Status: Published application
- Kind: A1
- Application number: 16/972,171
- Filed: 2019-08-20
- Published: 2021-08-05
- Earliest claimed: 2018-08-23
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Guilong JIN; Sung-Joong KANG; Eun-Bee KIM; Ji-Hoon RYU; Suk-Woo LEE; Jung-Pil LEE
- Web page: https://patentgrep.com/patent/US20210242446A1

## CPC

- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 50/471: Spacing elements inside cells other than separators, membranes or diaphragms (for preventing incorrect contact inside or outside batteries H01M50/584); Manufacturing processes thereof
- H01M 4/366: {as layered products}
- H01M 4/382: {Lithium (H01M4/405 takes precedence)}
- H01M 4/628: {Inhibitors, e.g. gassing inhibitors, corrosion inhibitors}
- H01M 10/052: Li-accumulators
- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01M 50/474: characterised by their position inside the cells
- H01M 50/477: characterised by their shape
- H01M 50/486: Organic material
- H01M 2300/0082: Organic polymers
- H01M 2300/0085: Immobilising or gelification of electrolyte
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present disclosure relates to an electrode assembly for an all-solid-state battery with improved safety, and more particularly, to an electrode assembly of a new structure designed to prevent the damage of a solid electrolyte layer caused by a step formed in a negative electrode layer due to changes in thickness of the negative electrode layer, such as an increase or decrease in thickness at part of the negative electrode layer, during charging/discharging. The electrode assembly is characterized by comprising a protective layer having an opening, interposed between the negative electrode and the solid electrolyte layer.

## Claims

### Claim 1

An all-solid type battery, comprising:
an electrode assembly comprising a negative electrode, a positive electrode and a solid electrolyte layer interposed between the positive electrode and the negative electrode,
wherein the negative electrode comprises lithium metal as a negative electrode active material,
wherein the solid electrolyte layer, the negative electrode and the positive electrode have equal area, or the solid electrolyte layer, the negative electrode and the positive electrode reduce in area in that order on the basis of an area of a stacked surface,
wherein the negative electrode is in surface contact with the solid electrolyte layer, and disposed within the surface of the solid electrolyte layer,
wherein the positive electrode is in indirect contact with the negative electrode, wherein the solid electrolyte layer is interposed between the positive electrode and the negative electrode, and disposed within the surface of the negative electrode,
wherein the electrode assembly further comprises a protective layer comprising polymer resin between the negative electrode and the solid electrolyte layer,
wherein the protective layer is in a shape of a frame with an edge portion having a predetermined width and an opening surrounded by the edge portion,
wherein an area of the opening is smaller than an area of the positive electrode, and
wherein the protective layer is placed such that the opening is disposed within the positive electrode surface.

### Claim 2 (depends on 1)

The all-solid type battery according to claim 1, wherein the solid electrolyte layer comprises a polymer based solid electrolyte.

### Claim 3 (depends on 2)

The all-solid type battery according to claim 2, wherein the polymer based solid electrolyte comprises at least one selected from the group consisting of a polyether based polymer, a polycarbonate based polymer, an acrylate based polymer, a polysiloxane based polymer, a phosphagen based polymer, a polyethylene derivative and an alkylene oxide derivative.

### Claim 4 (depends on 1)

The all-solid type battery according to claim 1, wherein an outer periphery of the negative electrode is not in direct contact with the solid electrolyte layer, and is in contact with the edge portion of the protective layer.

### Claim 5 (depends on 1)

The all-solid type battery according to claim 1, wherein a thickness of the protective layer is 1/10 to ½ of a thickness of the solid electrolyte layer.

### Claim 6 (depends on 1)

The all-solid type battery according to claim 1, wherein the edge portion of the protective layer extends outward beyond the solid electrolyte layer by a predetermined width.

### Claim 7 (depends on 1)

The all-solid type battery according to claim 1, wherein the positive electrode is stacked such that an outer periphery of the positive electrode is disposed within the edge portion of the protective layer.

### Claim 8 (depends on 1)

The all-solid type battery according to claim 1, wherein the solid electrolyte layer, the negative electrode and the positive electrode have equal area on the basis of the area of the stacked surface,
wherein an outer region having a predetermined width in the edge portion of the protective layer extends outward from the solid electrolyte layer, and
wherein the region extending outward is bent toward the solid electrolyte layer and surrounds a side of a stack of the solid electrolyte layer and the positive electrode.

### Claim 9 (depends on 8)

The all-solid type battery according to claim 8, wherein the protective layer is bent such that an end of the region extending outward covers an outer periphery of the positive electrode surface in whole or in part.

### Claim 10 (depends on 1)

The all-solid type battery according to claim 1, wherein the protective layer comprises at least one of polyethylene and polypropylene.

### Claim 11 (depends on 1)

The all-solid type battery according to claim 1, wherein the solid electrolyte layer, the negative electrode and the positive electrode have equal area.

### Claim 12 (depends on 1)

The all-solid type battery according to claim 1, wherein the solid electrolyte layer, the negative electrode and the positive electrode reduce in area in that order on the basis of an area of a stacked surface.

### Claim 13 (depends on 1)

The all-solid type battery according to claim 1, wherein two ends of the positive electrode surface are disposed within the width of the negative electrode surface, and two ends of the negative electrode surface are disposed within the width of the solid electrolyte layer surface.

### Claim 14 (depends on 1)

The all-solid type battery according to claim 1, wherein the protective layer comprises a film type layer comprising a polymer resin.

### Claim 15 (depends on 14)

The all-solid type battery according to claim 14, wherein the polymer resin is a polyolefin-based polymer resin.

### Claim 16 (depends on 15)

The all-solid type battery according to claim 15, wherein the polyolefin-based polymer resin comprises at least one polymer or copolymer prepared from at least one selected from the group consisting of ethylene, propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene, and mixtures thereof.

### Claim 17 (depends on 1)

The all-solid type battery according to claim 1, wherein the protective layer further comprises at least one polymer selected from the group consisting of polyethyleneterephthalate, polybutyleneterephthalate, polyester, polyacetal, polyamide, polycarbonate, polyimide, polyetheretherketone, polyethersulfone, polyphenyleneoxide, polyphenylenesulfidro, polyethylenenaphthalene, polysulfone, cellulose acetate and polystyrene.

### Claim 18 (depends on 1)

A battery module comprising at least one all-solid type battery according to claim 1.

### Claim 19 (depends on 1)

A battery pack comprising at least one all-solid type battery according to claim 1.

### Claim 20 (depends on 1)

A device comprising at least one all-solid type battery according to claim 1.