Sulfur-carbon composite, preparation method thereof, and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-2020220169-A1
Application number	US-201816647892-A
Country	US
Kind code	A1
Filing date	Oct 24, 2018
Priority date	Nov 24, 2017
Publication date	Jul 9, 2020
Grant date	—

Abstract

A sulfur-carbon composite including porous carbon material, and sulfur, wherein at least a portion of an inside and a surface of the porous carbon material coated with the sulfur, the sulfur-carbon composite has a pore volume of 0.180 cm 3 /g to 0.300 cm 3 /g, and the sulfur-carbon composite has an average pore size of 40.0 nm to 70.0 nm, and a method of manufacturing the same. Also, a method of manufacturing a sulfur-carbon composite, which includes (a) mixing a porous carbon material with sulfur particles, wherein the sulfur particles have a particle size of 1 nm to 1 μm using a Henschel mixer; and (b) drying the resulting mixture of (a).

First claim

1 . A sulfur-carbon composite comprising:
a porous carbon material; and sulfur, wherein at least a portion of an inside and a surface of the porous carbon material is coated with the sulfur, the sulfur-carbon composite has a pore volume of 0.180 cm 3 /g to 0.300 cm 3 /g, and the sulfur-carbon composite has an average pore size of 40.0 nm to 70.0 nm.

2 . The sulfur-carbon composite of claim 1 , wherein the sulfur-carbon composite has a pore volume of 0.200 cm 3 /g to 0.250 cm 3 /g, and
the sulfur-carbon composite has an average pore size of 50.0 nm to 65.0 nm.

3 . The sulfur-carbon composite of claim 1 , wherein the porous carbon material is in a form of a particle and has a diameter of 100 nm to 50 μm.

4 . The sulfur-carbon composite of claim 1 , wherein the sulfur and the porous carbon material are present in the sulfur-carbon composite at a weight ratio of 7.5:2.5 to 4:6.

5 . The sulfur-carbon composite of claim 1 , wherein the porous carbon material comprises one or more selected from the group consisting of graphite, graphene, carbon black, carbon nanotubes, carbon fibers, and activated charcoal.

6 . A cathode for lithium-sulfur batteries comprising the sulfur-carbon composite defined in claim 1 .

7 . A method of manufacturing a sulfur-carbon composite, comprising:
(a) mixing a porous carbon material with sulfur particles, wherein the sulfur particles have a particle size of 1 nm to 1 μm using a Henschel mixer; and (b) drying the resulting mixture of (a).

8 . The method of claim 7 , wherein the mixing by the Henschel mixer is carried out at a rate of 500 rpm to 3,000 rpm.

9 . The method of claim 7 , wherein the mixing by the Henschel mixer is carried out for 15 minutes to 3 hours.

10 . The method of claim 7 , wherein the sulfur-carbon composite has particle size distributions d90, d10, and d50 of 100 μm to 140 μm, 7 μm to 15 μm, and 30 μm to 70 μm, respectively.

11 . The method of claim 7 , wherein the sulfur-carbon composite has particle size distributions d90, d10, and d50 of 110 μm to 130 μm, 8 μm to 12 μm, and 40 μm to 60 μm, respectively.

12 . The method of claim 7 , wherein the porous carbon material comprises one or more selected from the group consisting of graphite, graphene, carbon black, carbon nanotubes, carbon fibers, and activated charcoal.

13 . The method of claim 7 , wherein the drying in step (b) is carried out at 130° C. to 180° C. for 15 minutes to 2 hours in an oven.

14 . The method of claim 7 , wherein the sulfur and the porous carbon material are present in the sulfur-carbon composite at a weight ratio of 7.5:2.5 to 4:6.

15 . A lithium-sulfur battery comprising the cathode defined in claim 6 ; an anode; and an electrolyte.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Eui Tae
• Sohn Kwonnam
• Yang Doo Kyung

Classifications

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/38 Primary

  of elements or alloys · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/362 Primary

  Composites · CPC title

• C01B32/15

  Nano-sized carbon materials · CPC title