Carbon-sulfur composite, preparation method therefor, and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-11502289-B2
Application number	US-201816646080-A
Country	US
Kind code	B2
Filing date	Sep 19, 2018
Priority date	Sep 28, 2017
Publication date	Nov 15, 2022
Grant date	Nov 15, 2022

Abstract

A carbon-sulfur composite including a carbonized metal-organic framework (MOF); and a sulfur compound introduced to at least a part of an outside surface and an inside of the carbonized metal-organic framework, wherein the carbonized metal-organic framework has a specific surface area of 1000 m2/g to 4000 m2/g, and the carbonized metal-organic framework has a pore volume of 0.1 cc/g to 10 cc/g, and a method for preparing the same.

First claim

The invention claimed is:

1. A carbon-sulfur composite comprising:
a carbonized metal-organic framework; and
a sulfur compound introduced to at least a part of an outside surface and an inside of the carbonized metal-organic framework,
wherein the carbonized metal-organic framework has a specific surface area of 2,000 m 2 /g to 2,500 m 2 /g according to BET analysis,
the carbonized metal-organic framework has a pore volume of 2.2 cc/g to 3.0 cc/g; and
the metal-organic framework comprises a structural unit represented by the following Chemical Formula 1:
[M x (L) y ]

wherein M is one or more metal selected from the group consisting of copper (Cu), zinc (Zn), iron (Fe), nickel (Ni), chromium (Cr), scandium (Sc), cobalt (Co), titanium (Ti), manganese (Mn), vanadium (V), aluminum (Al), magnesium (Mg), gallium (Ga) and indium (In);
L is one or more organic metal ligand selected from the group consisting of 1,4-benzenedicarboxylate (BDC), 1,3,5-benzenetricarboxlate (BTC), 1,1′-biphenyl-3,3′,5,5′-tetracarboxylate (BPTC) and 2-(N, N, N′, N′-tetrakis(4-carboxyphenyl)-biphenyl-4,4′-diamine (TCBTDA); and
x is an integer of 2 to 6, and y is an integer of 2 to 12.

2. The carbon-sulfur composite of claim 1 , wherein the carbonized metal-organic framework and the sulfur compound are present in a weight ratio of 9:1 to 1:9.

3. A method for preparing the carbon-sulfur composite according to claim 1 , comprising:
(a) preparing a carbonized metal-organic framework by carbonizing a metal-organic framework at a temperature of 1000° C. to 2000° C.; and
(b) preparing a carbon-sulfur composite by mixing the carbonized metal-organic framework of (a) with a sulfur compound.

4. The method for preparing a carbon-sulfur composite of claim 3 , wherein, in (a), the metal-organic framework is carbonized at 1000° C. to 1,500° C.

5. The method for preparing a carbon-sulfur composite of claim 3 , wherein, in (b), the carbonized metal-organic framework and the sulfur compound are mixed in a weight ratio of 9:1 to 1:9.

6. A positive electrode comprising the carbon-sulfur composite of claim 1 .

7. The positive electrode of claim 6 , which is suitable for a lithium-sulfur battery.

8. A lithium secondary battery comprising:
the positive electrode of claim 6 ;
a negative electrode; and
an electrolyte.

Assignees

• Lg Chemical Ltd
• Univ Yonsei Iacf
• Lg Energy Solution Ltd

Inventors

• Cho Eunkyung
• Han Suenghoon
• Song Myeong Jun
• Kim Il To
• Sohn Kwonnam
• Yang Doo Kyung
• Kim Jiwon
• Shin Moo Whan

Classifications

• C01P2006/14

  Pore volume · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/364 Primary

  as mixtures · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title