Sulfur-carbon composite and lithium-sulfur battery comprising same

Patent metadata

Field	Value
Publication number	US-2019245203-A1
Application number	US-201716099337-A
Country	US
Kind code	A1
Filing date	Oct 16, 2017
Priority date	Nov 2, 2016
Publication date	Aug 8, 2019
Grant date	—

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.

First 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.

2 . 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.

3 . 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.

4 . 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.

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

6 . 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.

7 . The sulfur-carbon composite of claim 1 , wherein the sulfur comprises at least one selected from the group consisting of inorganic sulfur (S 8 ), Li 2 S n (n≥1), organic sulfur compounds and carbon-sulfur polymers [(C 2 S x ) n , x=2.5 to 50, n≥2].

8 . 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.

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

10 . 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.

11 . 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.

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

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

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

Assignees

• Lg Chemical Ltd

Inventors

• Cho Eunkyung
• Yang Doo Kyung
• Koh Dongwook

Classifications

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M4/5815

  Sulfides · CPC title

• H01M4/602

  Polymers · CPC title

• H01M4/58

  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 · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title