Sulfur-containing composite for lithium-sulfur battery, a process for preparing said composite, and the electrode material and lithium-sulfur battery comprising said composite

Patent metadata

Field	Value
Publication number	US-9960421-B2
Application number	US-201315025942-A
Country	US
Kind code	B2
Filing date	Sep 30, 2013
Priority date	Sep 30, 2013
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

The present invention relates to a sulfur-containing composite with a core-shell structure for lithium-sulfur battery, wherein the substrate of the core contains macropores and/or mesopores and optionally micropores, and the substrate of the shell is a microporous coating layer; as well as a process for preparing said sulfur-containing composite, an electrode material and a lithium-sulfur battery comprising said sulfur-containing composite.

First claim

The invention claimed is:

1. A sulfur-containing composite with a core-shell structure, wherein the substrate of the core contains macropores and/or mesopores and optionally micropores, and the substrate of the shell is a microporous coating layer; wherein sulfur is loaded into said substrate of the core and optionally the shell; wherein the coating layer is a hydrothermal microporous carbon coating, wherein a carbon source for the coating is a carbohydrate selected from the group consisting of sucrose, D-glucose, fructose, and any combinations thereof, and wherein the substrate of the core is formed by using a silica template.

2. The sulfur-containing composite of claim 1 , wherein said substrate of the core is a carbon or conductive non-carbon substrate with ordered or disordered pore structures.

3. The sulfur-containing composite of claim 1 , wherein said substrate of the core is a carbon substrate.

4. The sulfur-containing composite of claim 1 , wherein said substrate of the core has a BET specific surface area of 300-4500 m 2 /g.

5. The sulfur-containing composite of claim 1 , wherein said substrate of the core has a pore volume of 0.1-3.0 cm 3 /g.

6. The sulfur-containing composite of claim 1 , wherein said substrate of the core has an average pore diameter of 0.4-100 nm.

7. The sulfur-containing composite of claim 1 , wherein said microporous coating layer includes one or more material selected from the group consisting of microporous conductive polymer, microporous metal oxides, microporous metal, and microporous silica.

8. The sulfur-containing composite of claim 1 , wherein said microporous coating layer has a thickness of 5-100 nm.

9. The sulfur-containing composite of claim 1 , wherein said microporous coating layer has an average pore diameter of 0.4-2.0 nm.

10. The sulfur-containing composite of claim 1 , wherein said sulfur-containing composite has a sulfur load amount of 20-90 wt. % based on the total weight of said sulfur-containing composite.

11. An electrode material, comprising the sulfur-containing composite of claim 1 .

12. A lithium-sulfur battery, comprising the sulfur-containing composite of claim 1 .

13. The sulfur-containing composite of claim 1 , wherein said substrate of the core is a carbon substrate selected from the group consisting of ordered mesoporous carbons CMK-3 and CMK-5, activated porous carbon, active charcoal, and any combinations thereof.

14. A process for preparing a sulfur-containing composite with a core-shell structure, including the steps of:
a) providing a substrate of the core, which contains macropores and/or mesopores and optionally micropores; and then
b) applying a microporous coating layer as the shell onto said substrate of the core, before or after
c) loading sulfur into said substrate of the core and optionally the shell,
wherein the coating layer is a hydrothermal microporous carbon coating, wherein a carbon source for the coating is a carbohydrate selected from the group consisting of sucrose, D-glucose, fructose, and any combinations thereof, and wherein the substrate of the core is formed by using a silica template.

15. The process of claim 14 , wherein said microporous coating layer is also applied by one or more coating methods selected from the group consisting of coating at room temperature with biomolecule, CVD coating, conductive polymer coating, resorcinol-formaldehyde resin carbon coating, and in-situ polymerization.

16. The process of claim 14 , wherein said substrate of the core is a carbon substrate with ordered pore structures; wherein after having applied the microporous coating layer onto said substrate of the core, said template is then removed.

17. The process of claim 14 , wherein the microporous coating layer is applied onto said substrate of the core; and then the sulfur is loaded into said substrate of the core and the shell; and then an additional coating layer is applied.

18. An electrode material, comprising the sulfur-containing composite prepared by the process of claim 14 .

19. A lithium-sulfur battery, comprising the sulfur-containing composite prepared by the process of claim 14 .

Assignees

• Bosch Gmbh Robert
• Inst Chemistry Cas
• Inst Of Chemistry Chinese Academy Of Science

Inventors

• Yin Yaxia
• Zhou Longjie
• Schumann Bernd
• Zhang Juan
• Zhao Nahong
• Guo Yuguo
• Ye Huan

Classifications

• H01M4/5815

  Sulfides · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• H01M10/0569

  characterised by the solvents · CPC title