# US 10,770,718 B2 · Lithium-sulfur secondary battery

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- Number: US 10,770,718 B2
- Document ID: US10770718B2
- Status: Granted
- Kind: B2
- Application number: 15/913,687
- Filed: 2018-03-06
- Published: 2018-10-18
- Granted: 2020-09-08
- Earliest claimed: 2017-04-12
- Assignees: Seoul National University R&Db Foundation; Institute for Basic Science
- Applicants: Seoul National University R&DB Foundation; Institute For Basic Science
- Inventors: Yung-Eun Sung; Chunjoong Kim; Jungjin Park
- Web page: https://patentgrep.com/patent/US10770718B2

## CPC

- H01M 4/136: Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- H01M 4/362: {Composites}
- H01M 4/364: {as mixtures}
- H01M 4/5815: {Sulfides}
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/625: {Carbon or graphite}
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 4/663: {containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres}
- H01M 4/667: {in the form of layers, e.g. coatings}
- H01M 4/806: {Nonwoven fibrous fabric containing only fibres}
- H01M 10/052: Li-accumulators
- 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

A lithium-sulfur secondary battery includes a cathode current collector and a cathode electrode on the cathode current collector. The cathode electrode includes a porous carbon interlayer electrode including a plurality of carbon fibers, metal sulfide catalyst particles dispersed and positioned on the porous carbon interlayer electrode, and sulfur-based active material particles dispersed on the porous carbon interlayer electrode to be attached thereto and including sulfur.

## Claims

### Claim 1

A lithium-sulfur secondary battery comprising:
a cathode current collector; and
a cathode electrode on the cathode current collector,
wherein the cathode electrode comprises:
a cathode active material sheet including sulfur-based active material particles including sulfur, a binder, and a conductive material,
a porous carbon interlayer electrode including a plurality of carbon fibers,
metal sulfide catalyst particles dispersed and positioned on the porous carbon interlayer electrode,
wherein the metal sulfide catalyst particles are also dispersed on the cathode active material sheet,
wherein the metal sulfide catalyst particles comprise tungsten disulfide (WS2).

### Claim 2 (depends on 1)

The lithium-sulfur secondary battery of claim 1, wherein the metal sulfide catalyst particles have sulfiphilic surfaces.

### Claim 3 (depends on 1)

The lithium-sulfur secondary battery of claim 1, wherein the porous carbon interlayer electrode comprises at least one selected from the group consisting of carbon fiber fabric, carbon fiber cloth, and carbon non-woven fabric.

### Claim 4 (depends on 1)

The lithium-sulfur secondary battery of claim 1, wherein the metal sulfide catalyst particles have an average diameter of about 1 nm to about 100 μm.

### Claim 5 (depends on 1)

The lithium-sulfur secondary battery of claim 1, wherein the sulfur-based active material particles have an average diameter of 100 nm to 10 μm.

### Claim 6 (depends on 1)

The lithium-sulfur secondary battery of claim 1, wherein the metal sulfide catalyst particles prevent dissolution of the sulfur-based active material particles from the cathode electrode.

### Claim 7

A lithium-sulfur secondary battery comprising:
a cathode current collector;
a cathode electrode on the cathode current collector,
wherein the cathode electrode comprises:
a cathode active material sheet including sulfur-based active material particles including sulfur, a binder, and a conductive material,
a carbon interlayer electrode comprising a plurality of carbon fibers, and
metal sulfide catalyst particles dispersed and positioned on the carbon interlayer electrode and comprising tungsten;
an anode current collector;
an anode electrode positioned on the anode current collector and comprising lithium;
a separator located between the anode electrode and the cathode electrode; and
an electrolyte allowing the separator to be immersed therein and being in contact with a surface of the cathode electrode,
wherein the metal sulfide catalyst particles are also dispersed and positioned on the cathode active material sheet,
wherein the metal sulfide catalyst particles comprise tungsten disulfide (WS2).

### Claim 8 (depends on 7)

The lithium-sulfur secondary battery of claim 7, the metal sulfide catalyst particles have sulfiphilic surfaces.

### Claim 9 (depends on 7)

The lithium-sulfur secondary battery of claim 7, wherein the metal sulfide catalyst particles prevent the sulfur-based active material particles from being dissolved in the electrolyte from the cathode electrode.

### Claim 10 (depends on 7)

The lithium-sulfur secondary battery of claim 7, wherein the metal sulfide catalyst particles have an average diameter of 1 nm to 100 μm.

### Claim 11 (depends on 7)

The lithium-sulfur secondary battery of claim 7, the sulfur-based active material particles have an average diameter of 100 nm to 10 μm.