# US 12,218,350 B2 · Negative electrode for lithium metal battery and lithium metal battery comprising same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,218,350 B2
- Document ID: US12218350B2
- Status: Granted
- Kind: B2
- Application number: 18/406,069
- Filed: 2024-01-05
- Published: 2024-05-02
- Granted: 2025-02-04
- Earliest claimed: 2017-12-04
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Sangil Han; Ilseok Kim; Jinkyu Kim; Jeonghye Lee; Byeonggyu Cho
- Web page: https://patentgrep.com/patent/US12218350B2

## CPC

- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/366: {as layered products}
- H01M 4/382: {Lithium (H01M4/405 takes precedence)}
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/623: {fluorinated polymers}
- H01M 4/625: {Carbon or graphite}
- 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 4/1395: of electrodes based on metals, Si or alloys
- H01M 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive 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 provides a negative electrode for a lithium metal battery and a lithium metal battery comprising the same, the negative electrode comprising: a first negative electrode including a lithium metal negative electrode; and a second negative electrode which is disposed on the first negative electrode and includes a coating layer including a carbon-based material. By using the negative electrode for a lithium metal battery, a lithium metal battery can have an improved charge and discharge efficiency and life time.

## Claims

### Claim 1

A negative electrode for a lithium metal battery comprising:
a first negative electrode comprising a lithium metal negative electrode; and
a second negative electrode on the first negative electrode and comprising a coating layer comprising a carbon-based material, the carbon-based material comprising a plurality of spherical graphene balls.

### Claim 2 (depends on 1)

The negative electrode of claim 1, wherein the plurality of spherical graphene balls comprising graphene and a silicon-based material.

### Claim 3 (depends on 2)

The negative electrode of claim 2, wherein the silicon-based material is SiOx, where 1<x<3.

### Claim 4 (depends on 2)

The negative electrode of claim 2, wherein the plurality of spherical graphene balls comprise the silicon-based material in an amount of 50% to 80% by weight based on a total weight of the graphene balls.

### Claim 5 (depends on 2)

The negative electrode of claim 2, wherein the plurality of spherical graphene balls have a specific surface area of 80 m2/g to 120 m2/g.

### Claim 6 (depends on 2)

The negative electrode of claim 2, wherein the plurality of spherical graphene balls have an electrical conductivity of 10 S/cm to 50 S/cm at room temperature (25° C.).

### Claim 7 (depends on 1)

The negative electrode of claim 1, wherein the coating layer further comprises at least one selected from a polymer binder and a lithium salt.

### Claim 8 (depends on 7)

The negative electrode of claim 7, wherein the polymer binder includes at least one selected from the group consisting of a vinylidene fluoride/hexafluoropropylene copolymer, polyvinylidene fluoride (PVDF), polyacrylonitrile, polymethylmethacrylate, polytetrafluoroethylene, and a styrene butadiene rubber-based copolymer.

### Claim 9 (depends on 7)

The negative electrode of claim 7, wherein the lithium salt includes at least one selected from the group consisting of LiDFOB, LiFSI, LiSCN, LiN(CN)2, LiClO4, LiBF4, LiAsF6, LiPF6, LiCF3SO3, LiC(CF3SO2)3, LiN(SO2C2F5)2, LiN(SO2CF3)2, LiN(SO2F)2, LiSbF6, LiPF3(CF2CF3)3, LiPF3(CF3)3, and LiB(C2O4)2.

### Claim 10 (depends on 1)

The negative electrode of claim 1, wherein the coating layer has a thickness in a range of 2 μm to 100 μm.

### Claim 11 (depends on 1)

The negative electrode of claim 1, further comprising a solid electrolyte interface (SEI) film formed on the second negative electrode.

### Claim 12 (depends on 1)

A lithium metal battery comprising:
a positive electrode;
the negative electrode of claim 1; and
an electrolyte between the positive electrode and the negative electrode.

### Claim 13 (depends on 12)

The lithium metal battery of claim 12, wherein the positive electrode includes a positive electrode active material represented by Chemical Formula 1:
LiCo1−xMxO2 <Chemical Formula 1>
wherein in the above formula,
M is at least one selected from the group consisting of Ni, Mn, Al, Cu, Fe, Mg, Cr, Zn, B, and Ga, and
0.5<x<1.

### Claim 14 (depends on 12)

The lithium metal battery of claim 12, wherein the electrolyte is a liquid electrolyte including a lithium salt and an organic solvent.

### Claim 15 (depends on 14)

The lithium metal battery of claim 14, wherein the organic solvent is a carbonate-based compound or an ether-based compound.