Method for preparing graphite-titanium oxide composite

Patent metadata

Field	Value
Publication number	US-10062899-B2
Application number	US-201415034046-A
Country	US
Kind code	B2
Filing date	Aug 18, 2014
Priority date	Aug 19, 2013
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

According to an embodiment of the present invention, a method for preparing a graphite-titanium oxide composite comprises (S1) a surface-modifying graphite with benzyl alcohol or a cellulose-based material using a sol-gel method, (S2) distributing the surface-modified graphite in a solvent, adding a titanium precursor to the solvent, and mixing the titanium precursor with the surface-modified graphite to obtain a graphite-titanium mixture, and (S3) thermally treating the graphite-titanium mixture to grow a titanium oxide on a surface of the graphite.

First claim

What is claimed is:

1. A method for preparing a graphite-titanium oxide composite, the method comprising the steps of:
(S1) a surface-modifying graphite with benzyl alcohol or a cellulose-based material using a sol-gel method;
(S2) distributing the surface-modified graphite in a solvent, adding a titanium precursor to the solvent, and mixing the titanium precursor with the surface-modified graphite to obtain a graphite-titanium mixture; and
(S3) thermally treating the graphite-titanium mixture to grow a titanium oxide on a surface of the graphite, wherein the titanium precursor is titanium butoxide or titanium isopropoxide.

2. The method of claim 1 , wherein the solvent is a mixture of ethanol and distilled water or a mixture of ethanol and peroxide.

3. The method of claim 2 , wherein NH4OH or HNO3 is added to the distilled water.

4. The method of claim 2 , wherein in the mixture of the ethanol and the distilled water, a weight ratio of the ethanol to the distilled water is 5:1 to 100:1.

5. The method of claim 2 , wherein in the mixture of the ethanol and the peroxide, a weight ratio of the ethanol and the peroxide is 5:1 to 100:1.

6. The method of claim 1 , wherein, in step S2, 5 parts by weight to 40 parts by weight of the titanium precursor are added relative to 100 parts by weight of the graphite.

7. The method of claim 1 , wherein the thermal treatment is performed in an atmosphere of argon (Ar) at 600° C. to 800° C. for two hours to five hours.

8. The method of claim 1 , further comprising, after step S2, mixing the mixture obtained in step S2 with a lithium precursor and performing hydrothermal synthesis.

9. The method of claim 8 , wherein the hydrothermal synthesis is performed at 80° C. to 180° C. for 10 hours to 12 hours.

10. The method of claim 8 , wherein 10 parts by weight to 80 parts by weight of the lithium precursor are added relative to 100 parts by weight of the graphite.

11. The method of claim 8 , wherein the lithium precursor is any one selected from the group consisting of lithium hydroxide, lithium acetate dehydrate, and lithium nitrate.

Assignees

• Univ Dongguk Ind Acad Coop

Inventors

• Kang Yong-Mook
• Jo Mi-Ru
• Song Da-Hye
• Lee Gi-Hyeok

Classifications

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/1393

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

• C30B29/16

  Oxides · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2004/80

  Particles consisting of a mixture of two or more inorganic phases · CPC title