Graphene/carbon nano-tube composite material, and preparation method and application thereof

A technology of carbon nanotubes and composite materials, which is applied in the field of electrochemistry, can solve the problem of low capacity, and achieve the effect of increasing material capacitance, increasing capacity, and increasing pseudocapacitance

Inactive Publication Date: 2014-05-14
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the actual prepared graphene electrode material has a low capacity due to agglomeration and other reasons. The capacity of the aqueous system is 135 F / g, and the capacity of the organic system is 99 F / g, which is far from the theoretical capacity (550 F / g).

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  • Graphene/carbon nano-tube composite material, and preparation method and application thereof

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preparation example Construction

[0018] Preparation of graphene / carbon nanotube composites: In the present invention, the preparation process is roughly divided into the following steps.

[0019] (a) Preparation of graphene oxide suspension: Put graphite oxide in water and ultrasonically obtain a graphite oxide suspension with a concentration of 0.5 mg / L, then add Nitric acid with a concentration of 50-70% was sonicated for 0.5-1 h to obtain a graphene oxide suspension.

[0020] (b) Preparation of carbon nanotube suspension: add carbon nanotubes into water, and form a carbon nanotube suspension with a concentration of 0.5mg / L after ultrasonication for 0.5~1h.

[0021] (c) Preparation of graphene oxide / carbon nanotube composites: Mix the obtained graphene oxide suspension and carbon nanotube suspension at a volume ratio of 1:(0.43~2.33), filter after ultrasonication for 1~2h, and filter at 60 Dry at ~80°C to obtain graphene oxide / carbon nanotube composites.

[0022] (d) Preparation of graphene / carbon nanot...

Embodiment 1

[0039] Example 1: The preparation method in Example 1 of the present invention includes the following steps.

[0040](a) Preparation of graphene oxide suspension: put graphite oxide in water and ultrasonically obtain a graphite oxide suspension with a concentration of 0.5 mg / L, and then add 50% graphite oxide to the graphite oxide suspension at a mass-volume ratio of 1 mg:1 mL Nitric acid, after ultrasonication for 0.5h, a graphene oxide suspension was obtained.

[0041] (b) Preparation of carbon nanotube suspension: set the conductivity to 10 3 S / m single-walled carbon nanotubes were added to water, and a suspension of carbon nanotubes with a concentration of 0.5 mg / L was formed after ultrasonication for 0.5 h.

[0042] (c) Preparation of graphene oxide / carbon nanotube composite: Mix 300ml of graphene oxide suspension and 129ml of carbon nanotube suspension (volume ratio: 1:0.43), sonicate for 1h, filter, and dry at 60°C , to obtain graphene oxide / carbon nanotube composit...

Embodiment 2

[0044] Example 2: The preparation method in Example 2 of the present invention includes the following steps.

[0045] (a) Preparation of graphene oxide suspension: Put graphite oxide in water and ultrasonically obtain a graphite oxide suspension with a concentration of 0.5 mg / L, then add 55% graphite oxide to the graphite oxide suspension at a mass-volume ratio of 1 mg: 3 mL Nitric acid, after ultrasonication for 40min, a graphene oxide suspension was obtained.

[0046] (b) Preparation of carbon nanotube suspension: set the conductivity to 10 5 S / m single-walled carbon nanotubes were added to water, and a suspension of carbon nanotubes with a concentration of 0.5 mg / L was formed after ultrasonication for 40 minutes.

[0047] (c) Preparation of graphene oxide / carbon nanotube composite: Mix 300ml of graphene oxide suspension and 300ml of carbon nanotube suspension (volume ratio 1:1), and filter after ultrasonication for 1.5h. Dry to obtain a graphene oxide / carbon nanotube co...

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Abstract

The invention relates to a graphene/carbon nano-tube composite material and a preparation method thereof. The preparation method comprises the following steps of a) preparing a suspension of graphene oxide, b) preparing a suspension of carbon nano-tube, and c) preparing a composite of graphene oxide/ carbon nano-tube. The invention also relates to application of the graphene/carbon nano-tube composite material which is used as an electrode material in an electrochemical capacitor. The graphene/carbon nano-tube composite material prepared by the method of the invention solves the problem that the capacitance of a graphene electrode material is relatively low, the composite carbon nano-tube prevents graphene from agglomeration to improve the double-electric-layer capacitance, and a carbonyl is added into the graphene to increase the fake capacitance and further to improve the capacitance of the electrode material.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a graphene / carbon nanotube composite material and a preparation method thereof. The invention also relates to the application of the graphene / carbon nanotube composite material in an electrochemical capacitor as an electrode material. Background technique [0002] Supercapacitors, also known as electrochemical capacitors or electric double layer capacitors, are a new type of energy storage element between traditional capacitors and batteries. Compared with traditional capacitors, they have higher specific capacitance and energy density. Compared with batteries It has a higher power density. Due to the advantages of fast charging and discharging, no pollution to the environment and long cycle life, supercapacitors are very promising to become a new type of green energy in this century. Electrode materials are an important part of supercapacitors and a key factor affecting the cap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/38H01G11/36
CPCY02E60/13
Inventor 周明杰王要兵钟玲珑吴凤
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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