# US 10,873,084 B2 · Lithium secondary battery

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

- Number: US 10,873,084 B2
- Document ID: US10873084B2
- Status: Granted
- Kind: B2
- Application number: 16/154,198
- Filed: 2018-10-08
- Published: 2019-02-07
- Granted: 2020-12-22
- Earliest claimed: 2012-12-07
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Seitaro Ito; Satoshi Fujiki; Takanobu Yamada; Yuichi Aihara
- Web page: https://patentgrep.com/patent/US10873084B2

## CPC

- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/366: {as layered products}
- H01M 10/052: Li-accumulators
- H01M 10/0562: Solid materials
- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- 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

A lithium secondary battery including: a positive electrode, a negative electrode, and a sulfide solid electrolyte disposed between the positive electrode and the negative electrode, wherein the positive electrode includes a positive active material particle and a coating film including an oxide including lithium (Li) and zirconium (Zr) on a surface of the positive active material particle.

## Claims

### Claim 1

A lithium secondary battery comprising:
a positive electrode;
a negative electrode; and
a sulfide solid electrolyte disposed between the positive electrode and the negative electrode,
wherein the sulfide solid electrolyte comprises lithium sulfide and phosphorus pentasulfide,
wherein the positive electrode comprises a positive active material particle and a coating film on a surface of the positive active material particle,
wherein the coating film comprises a composite having a structure represented by Formula 1,
aLi2O—ZrO2 Formula 1
wherein 0.1≤a≤2.0,
wherein an amount of the composite is in a range of 0.1 to 2.0 mole percent, based on a total amount of the positive active material particle and the composite,
wherein the positive active material particle has a layered rock salt structure,
wherein the positive active material particle has a D50 particle diameter of 10 micrometers or less, and
wherein the positive active material particle is
LiNixCoyAlzO2, wherein 0<x<1, 0<y<1, 0<z≤0.33, and x+y+z=1
LiNixCoyMnzO2 wherein 0<x<1, 0<y<1, 0<z≤0.33, and x+y+z=1, or
a combination thereof.

### Claim 2 (depends on 1)

The lithium secondary battery of claim 1, wherein the amount of the composite is in a range of 0.1 to 0.95 mole percent, based on the total amount of the positive active material particle and the composite.

### Claim 3 (depends on 1)

The lithium secondary battery of claim 1, wherein a ratio of the lithium sulfide to the phosphorus pentasulfide is in a range of about 50:50 to about 80:20.

### Claim 4 (depends on 1)

The lithium secondary battery of claim 1, wherein the D50 particle diameter of the positive active material particle is about 6.4 micrometers to 10 micrometers.

### Claim 5 (depends on 1)

The lithium secondary battery of claim 1, wherein the D50 particle diameter of the positive active material particle is about 6.4 micrometers to about 7 micrometers.

### Claim 6 (depends on 1)

The lithium secondary battery of claim 1, wherein the D50 particle diameter of the positive active material particle is about 7 micrometers to 10 micrometers.

### Claim 7 (depends on 1)

The lithium secondary battery of claim 1, wherein the D50 particle diameter of the positive active material particle is about 6.4 micrometers.

### Claim 8 (depends on 1)

The lithium secondary battery of claim 1, wherein the D50 particle diameter of the positive active material particle is about 7 micrometers.

### Claim 9 (depends on 1)

The lithium secondary battery of claim 1, wherein the D50 particle diameter of the positive active material particle is about 8 micrometers to 10 micrometers.

### Claim 10 (depends on 1)

The lithium secondary battery of claim 1, wherein an initial discharge capacity of the lithium secondary battery is increased by 10.55% to 29.41% as compared to a same battery comprising a positive electrode comprising the positive active material particle without the coating film.

### Claim 11 (depends on 1)

The lithium secondary battery of claim 1, wherein the D50 particle diameter of the positive active material particle is about 6.4 micrometers to 10 micrometers, and
wherein an initial discharge capacity of the lithium secondary battery is increased by 10.55% to 29.41% as compared to a same battery comprising a positive electrode comprising the positive active material particle without the coating film.

### Claim 12 (depends on 1)

The lithium secondary battery of claim 1, wherein an initial discharge capacity of the lithium secondary battery is increased by 10.55% to 17.02% as compared to a same battery comprising a positive electrode comprising the positive active material particle without the coating film.

### Claim 13 (depends on 1)

The lithium secondary battery of claim 1, wherein the D50 particle diameter of the positive active material particle is about 6.4 micrometers to about 7 micrometers, and wherein an initial discharge capacity of the lithium secondary battery is increased by 10.55% to 17.02% as compared to a same battery comprising a positive electrode comprising the positive active material particle without the coating film.