# US 2019/0245203 A1 · Sulfur-carbon composite and lithium-sulfur battery comprising same

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- Number: US 2019/0245203 A1
- Document ID: US20190245203A1
- Status: Published application
- Kind: A1
- Application number: 16/099,337
- Filed: 2017-10-16
- Published: 2019-08-08
- Earliest claimed: 2016-11-02
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Eunkyung CHO; Doo Kyung YANG; Dongwook KOH
- Web page: https://patentgrep.com/patent/US20190245203A1

## CPC

- H01M 4/38: of elements or alloys
- C01B 17/00: Sulfur; Compounds thereof
- C01B 32/00: Carbon; Compounds thereof (C01B21/00, C01B23/00 take precedence; percarbonates C01B15/10; carbon black C09C1/48)
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/58: of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M 4/5815: {Sulfides}
- H01M 4/587: for inserting or intercalating light metals
- H01M 4/602: {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
- C01P 2006/16: Pore diameter
- H01M 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- H01M 2300/0082: Organic polymers
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A sulfur-carbon composite and a lithium-sulfur battery including the same, and in particular, to a sulfur-carbon composite comprising a porous carbon material; and sulfur on at least a part of an inside and outside surface of the porous carbon material, wherein the inside and outside surface of the porous carbon material include a coating layer comprising an ion conducting polymer, and a lithium-sulfur battery including the same. Also provided is an ion conducting polymer coating layer on a porous carbon material surface which thereby improves a lithium ion conducting property to a positive electrode, and as a result, may enhance capacity and life time properties of a lithium-sulfur battery.

## Claims

### Claim 1

A sulfur-carbon composite, comprising:
a porous carbon material; and
sulfur on at least a part of an inside and outside surface of the porous carbon material,
wherein the inside and outside surface of the porous carbon material include a coating layer comprising an ion conducting polymer.

### Claim 2 (depends on 1)

The sulfur-carbon composite of claim 1, wherein the ion conducting polymer comprises at least one selected from the group consisting of poly(ethylene oxide), poly(propylene oxide), poly(vinylidene fluoride), poly(vinylidene fluoride-co-hexafluoropropylene), poly(olefin), polyphosphazene, po ly(acrylonitrile), poly(methylmethacrylate), poly(vinyl chloride) and polysiloxane.

### Claim 3 (depends on 1)

The sulfur-carbon composite of claim 1, wherein the ion conducting polymer is included in an amount of from 0.1 parts by weight to 50 parts by weight, based on 100 parts by weight of the porous carbon material.

### Claim 4 (depends on 1)

The sulfur-carbon composite of claim 1, wherein the porous carbon material comprises at least one selected from the group consisting of graphite, graphene, carbon black, carbon nanotubes, carbon fibers and active carbon.

### Claim 5 (depends on 1)

The sulfur-carbon composite of claim 1, wherein the porous carbon material has an average pore diameter of from 1 nm to 200 nm.

### Claim 6 (depends on 1)

The sulfur-carbon composite of claim 1, wherein the porous carbon material has porosity of from 10% to 90% of a total volume of the porous carbon material.

### Claim 7 (depends on 1)

The sulfur-carbon composite of claim 1, wherein the sulfur comprises at least one selected from the group consisting of inorganic sulfur (S8), Li2Sn (n≥1), organic sulfur compounds and carbon-sulfur polymers [(C2Sx)n, x=2.5 to 50, n≥2].

### Claim 8 (depends on 1)

The sulfur-carbon composite of claim 1, wherein a weight ratio of (a) the porous carbon material and the coating layer comprising. the ion conducting polymer and (b) the sulfur,— is from 1:9 to 5:5.

### Claim 9

A sulfur-carbon composite comprising:
a carbon material of which surface is coated with an ion conducting polymer; and
sulfur.

### Claim 10 (depends on 9)

The sulfur-carbon composite of claim 9, wherein the ion conducting polymer comprises at least one selected from the group consisting of poly(ethylene oxide), poly(propylene oxide), poly(vinylidene fluoride), poly(vinylidene fluoride-co-hexafluoropropylene), poly(olefin), polyphosphazene, poly(acrylonitrile), poly(methylmethacrylate), poly(vinyl chloride) and polysiloxane.

### Claim 11 (depends on 9)

The sulfur-carbon composite of claim 9, wherein the carbon material comprises at least one selected from the group consisting of natural graphite, artificial graphite and expanded graphite.

### Claim 12 (depends on 9)

The sulfur-carbon composite of claim 9, the sulfur-carbon composite further comprises a conductive material.

### Claim 13 (depends on 1)

A positive electrode for a lithium-sulfur battery comprising the sulfur-carbon composite of claim 1.

### Claim 14 (depends on 13)

A lithium-sulfur battery comprising the positive electrode of claim 13.