Carbon nanotube-sulfur composite comprising carbon nanotube aggregates, and method for preparing same

Patent metadata

Field	Value
Publication number	US-2016248087-A1
Application number	US-201415029911-A
Country	US
Kind code	A1
Filing date	Oct 8, 2014
Priority date	Oct 18, 2013
Publication date	Aug 25, 2016
Grant date	—

Abstract

The present application relates to a carbon nanotube-sulfur composite including a carbon nanotube aggregate, and a method for preparing the same.

First claim

1 . A carbon nanotube-sulfur composite comprising:
a carbon nanotube aggregate; and sulfur or a sulfur compound positioned on an external surface and in an inside of the carbon nanotube aggregate, wherein a tap density of the carbon nanotube aggregate is 0.01 g/cc or more and 1 g/cc or less.

2 . The carbon nanotube-sulfur composite of claim 1 , wherein the carbon nanotube aggregate has a porosity of 10% or more and 70% or less based on a total volume of the aggregate.

3 . The carbon nanotube-sulfur composite of claim 1 , wherein sulfur or the sulfur compound is positioned in a region of less than 100% of the entire external surface of the carbon nanotube aggregate.

4 . The carbon nanotube-sulfur composite of claim 1 , wherein in the carbon nanotube-sulfur composite, a content ratio of the carbon nanotube aggregate and sulfur or the sulfur compound is 10 to 50:50 to 90 based on wt %.

5 . The carbon nanotube-sulfur composite of claim 1 , wherein a diameter of the carbon nanotube aggregate is 500 micrometers or less.

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

7 . The positive electrode of claim 6 , further comprising:
at least one of a conductive material and a binder.

8 . A lithium-sulfur battery comprising:
a positive electrode for a lithium-sulfur battery, which includes the carbon nanotube-sulfur composite of claim 1 ; a negative electrode; and a separation membrane positioned between the positive electrode and the negative electrode.

9 . (canceled)

10 . A method for preparing a carbon nanotube-sulfur composite, comprising:
impregnating sulfur or a sulfur compound on an external surface and in an inside of a carbon nanotube aggregate, wherein a tap density of the carbon nanotube aggregate is 0.01 g/cc or more and 1 g/cc or less.

11 . The method of claim 10 , wherein sulfur or the sulfur compound is positioned in a region of less than 100% of the entire external surface of the carbon nanotube aggregate.

12 . The method of claim 10 , further comprising:
adjusting a size of a diameter of the carbon nanotube aggregate to 50 micrometers or less before, after, or before and after the impregnating of sulfur or the sulfur compound.

13 . The method of claim 12 , wherein in the adjusting of the size, the diameter of the carbon nanotube aggregate is adjusted to 1 micrometer or more and 10 micrometers or less.

14 . The method of claim 12 , wherein the adjusting of the size is performed by using a dry ball mill method, a dry jet mill method, or a dry Dyno mill method.

15 . The method of claim 12 , wherein after the adjusting of the size, the carbon nanotube aggregate has a porosity of 10% or more and 70% or less based on a total volume of the aggregate.

16 . The method of claim 10 , wherein a content ratio of the carbon nanotube aggregate and sulfur or the sulfur compound is 10 to 50:50 to 90 based on wt %.

17 . The method of claim 10 , wherein the impregnating of sulfur or the sulfur compound is performed by mixing the carbon nanotube aggregate and sulfur or sulfur compound powder, and then heating a mixture to impregnate the molten sulfur or sulfur compound in the carbon nanotube aggregate.

18 . The method of claim 17 , wherein a heating temperature is 115° C. or more and 180° C. or less.

19 . The method of claim 10 , wherein the impregnating of sulfur or the sulfur compound is performed by dissolving sulfur or the sulfur compound in an organic solvent, and then adding the carbon nanotube aggregate to grow sulfur or the sulfur compound.

20 . (canceled)

21 . The method of claim 10 , wherein the impregnating of sulfur or the sulfur compound is performed by mixing the carbon nanotube aggregate and sulfur or sulfur compound powder, and then performing impregnating by a ball mill method.

22 . The method of claim 10 , further comprising:
preparing the carbon nanotube aggregate (S 01 ) before the impregnating of sulfur or the sulfur compound, wherein the preparing of the carbon nanotube aggregate (S 01 ) includes preparing a carbon nanotube, and in the preparing of the carbon nanotube, a catalyst amount is 0.1% to 10% based on a total weight of the generated carbon nanotube.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Min Seo
• Lee Seong Ho
• Jang Minchul
• Sung Da Young

Classifications

• H01M4/1393

  of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/1397

  of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• H01M4/043

  involving compressing or compaction · CPC title