Method of manufacturing graphene composite including ultrasonic-wave pulverization post-treatment process and method of manufacturing active material using the same

Patent metadata

Field	Value
Publication number	US-10176932-B2
Application number	US-201615237950-A
Country	US
Kind code	B2
Filing date	Aug 16, 2016
Priority date	Aug 19, 2015
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

A method of manufacturing a graphene composite including an ultrasonic-wave pulverization post-treatment process. The method includes radiating a microwave on a mixture of graphite oxide and a conducting agent, dispersing a resultant material, obtained during the radiating the microwave, in a liquid and performing ultrasonic-wave pulverization, and freeze-drying particles subjected to the ultrasonic-wave pulverization. The post-treatment process is added to the method of manufacturing the graphene composite including the reduced graphene oxide using the graphite oxide, thereby manufacturing a graphene composite having improved bindability with spherical activated carbon used to manufacture an active material. Further, the post-treated graphene composite is used to manufacture the active material and the supercapacitor, and accordingly, the active material can be thinly and densely applied to provide a supercapacitor having improved performance.

First claim

What is claimed is:

1. A method of manufacturing a graphene composite, including an ultrasonic-wave pulverization post-treatment process, the method comprising:
radiating with a microwave, a mixture of graphite oxide and a conducting agent in powder form, resulting in a reduced graphite oxide material;
dispersing the resulting reduced graphite oxide material in a liquid to form a colloidal solution;
pulverizing particles in the colloidal solution using an ultrasonic-wave; and
freeze-drying the pulverized particles.

2. The method of claim 1 , wherein the ultrasonic wave is applied at a power of 350 W or more for 1 hour or more during the ultrasonic-wave pulverization.

3. The method of claim 1 , wherein the freeze-drying is performed at a temperature of −45° C. or less for 20 hours or more.

4. The method of claim 1 , wherein a graphite powder is oxidized to obtain the graphite oxide.

5. The method of claim 1 , wherein the conducting agent is at least one material selected from conductive carbon black and graphene oxide.

6. The method of claim 1 , wherein the radiating the microwave is performed at power of 600 W or more in an inert gas atmosphere for 50 sec or more.

7. A method of manufacturing an active material for a supercapacitor, the method comprising:
radiating with a microwave, a mixture of graphite oxide and a conducting agent in powder form, resulting in a graphite oxide material;
dispersing the material resulting graphite oxide material, in a liquid to form a colloidal solution;
pulverizing particles in the colloidal solution with an ultrasonic-wave;
freeze-drying the pulverized particles to form a graphene composite; and
mixing the formed graphene composite and an activated carbon, forming the active material for the supercapacitor.

8. The method of claim 7 , wherein the activated carbon for the active material is spherical.

Assignees

• Korea Inst Energy Res

Inventors

• Yeon Sun-Hwa
• Jeon Myung-Seok
• Shin Kyoung-Hee
• Jin Chang-Soo
• Lee Bum-Suk
• Park Se-Kook
• Kim Dong-Ha
• Lee Sang Ho

Classifications

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01G11/34 Primary

  characterised by carbonisation or activation of carbon · CPC title

• C01B32/23

  Oxidation · CPC title

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title