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Preparation method of electrode material graphene nanometer sheet and electrode sheet prepared therefrom

A technology of graphene nanosheets and electrode materials, which is applied in the manufacture of electrolytic capacitors, hybrid capacitor electrodes, and hybrid/electric double layer capacitors. It can solve the problems of not using graphene supercapacitor electrode materials and achieve excellent electrochemical performance. The effect of easy operation and simple process

Active Publication Date: 2010-10-27
北京华科讯能石墨烯新技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are currently no patent applications for the use of graphene prepared by ball milling as an electrode material for supercapacitors

Method used

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  • Preparation method of electrode material graphene nanometer sheet and electrode sheet prepared therefrom
  • Preparation method of electrode material graphene nanometer sheet and electrode sheet prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 5.5g of natural flake graphite and add it to a mixture of 90ml of concentrated sulfuric acid (98% concentration) and 47.5ml of concentrated nitric acid (65% concentration) at 0-4°C, then add 5 grams of potassium chlorate every 5 minutes , a total of 55 grams, after 96 hours of continuous reaction, rinse repeatedly with 0.1mol / L dilute hydrochloric acid and then deionized water until no chlorine ions and sulfate ions are detected and the pH value reaches neutral. After drying in a drying oven at 60°C, grind and sieve to obtain graphite oxide powder.

[0018] Put 0.1g of graphite oxide powder into a 100ml crucible and put it into a muffle furnace preheated to 1000°C in an air atmosphere for rapid heat treatment for 30 seconds to obtain expanded graphite.

[0019] Weigh 0.5g of expanded graphite, mix it with 188.5g of grinding balls and place it in an agate ball ink tank, and ball mill for 2h at a speed of 428rpm in a planetary ball mill to obtain graphene nanosheets...

Embodiment 2

[0023] The operation method is the same as in Example 1, and the ball milling time is the graphene nanosheet electrode prepared for 3h. When the current density is gradually increased from 100mA / g to 2000mA / g, the stability after 100 charge-discharge cycles is measured under each current density. The discharge specific capacity is 210F / g-179F / g, and the capacity retention rate is 85%.

Embodiment 3

[0025] The operation method is the same as in Example 1, and the graphene nanosheet electrode prepared by the ball milling time is 4h. When the current density gradually increases from 100mA / g to 2000mA / g, the stable discharge specific capacity after 100 charge-discharge cycles at each current density It is 176F / g-158F / g, and the capacity retention rate is 90%.

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Abstract

The invention provides a preparation method of an electrode material graphene nanometer sheet and an electrode sheet of a super capacitor prepared from the material. An electrode of the super capacitor assembled by using the material has a stable specific capacity up to 164-210 F / g under the current density of 100 mA / g; and a capacity retention ratio is more than 85% when the current density is gradually increased to 2000 mA / g from 1000 mA / g. The preparation of the graphene nano sheet by using a ball milling method has the advantages of simple method, easy operation, high specific capacity, good cycle performance and the like.

Description

technical field [0001] The invention relates to the field of supercapacitors, in particular to a method for preparing an electrode material for a supercapacitor and an electrode sheet prepared by using the electrode material. Background technique [0002] Carbon materials have become the most widely used electrode materials in supercapacitors due to their high specific surface area, good electrochemical stability, simple production process, and low cost. There are a variety of porous carbon materials currently used in capacitors, including activated carbon, mesoporous carbon, carbon aerogel, activated carbon fiber, and carbon nanotubes, all of which exhibit high specific capacitance and energy density. However, on the one hand, due to the complex pore distribution and structure of porous carbon materials, the resistance of electrolyte diffusion in the interior is relatively large, resulting in very low utilization of the specific surface area of ​​porous materials [A.G.Pando...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01G9/058H01G11/36H01G11/86
CPCY02E60/13
Inventor 宋怀河赵生娜陈晓红
Owner 北京华科讯能石墨烯新技术研究院有限公司
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