Preparation method of graphene/active carbon composite film

A technology of supercapacitor and activated carbon, which is applied in the preparation of graphene/activated carbon composite film and the field of supercapacitor electrodes made of graphene/activated carbon composite film, which can solve the problems of film structure damage, adverse effects of mechanical stability, loss of performance, etc. Achieve the effects of eliminating re-stacking, stable cycle characteristics, and high specific capacitance

A technology of supercapacitor and activated carbon, which is applied in the preparation of graphene/activated carbon composite film and the field of supercapacitor electrodes made of graphene/activated carbon composite film, which can solve the problems of film structure damage, adverse effects of mechanical stability, loss of performance, etc. Achieve the effects of eliminating re-stacking, stable cycle characteristics, and high specific capacitance

CN106531459AInactive Publication Date: 2017-03-22WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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  • Preparation method of graphene/active carbon composite film
  • Preparation method of graphene/active carbon composite film
  • Preparation method of graphene/active carbon composite film

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Embodiment 1

[0027] The invention discloses a preparation method of a graphene / activated carbon composite film, which can prepare a graphene supercapacitor electrode film with higher specific capacity and better cycle performance, comprising the following steps:

[0028] a) Using graphene oxide dispersion and activated carbon as starting materials, activated carbon is acid-modified and mixed with graphene oxide dispersion;

[0029] b) Place the graphene / activated carbon mixture in a flat-bottomed tank for freezing treatment. The flat-bottomed tank includes a circular flat-bottomed tank or a square flat-bottomed tank. The length and width of the square tank must be greater than or equal to the size of the required electrode film , the thickness of which can be adjusted to control the thickness of the final electrode film, followed by drying the freeze-treated solid mixture in a vacuum freeze dryer, and then performing thermal reduction of graphene oxide to obtain graphene / activated carbon ai...

Embodiment 2

[0032] Embodiment 2 is a further embodiment on the basis of Embodiment 1.

[0033] The graphene oxide dispersion liquid is obtained by uniformly dispersing graphene oxide solids in deionized water, with a concentration of 1-20 mg / mL; the acid modification treatment step is: take special activated carbon for supercapacitor or adsorption The mass ratio of activated carbon to concentrated sulfuric acid is 1:10 to 1:1000. After mixing, keep warm for 1 to 20 hours for surface modification treatment, then wash with water until neutral, and dry at 30 to 250°C under normal pressure for later use; take 50 mL of graphene oxide dispersion Mix with modified activated carbon, the mass ratio of activated carbon to graphene oxide in the mixture is 20:1~1:10, the mixing is carried out under continuous or intermittent stirring, the stirring speed is 50~5000rpm; the graphene / activated carbon mixed liquid is placed In a flat-bottomed tank with a depth of 5 to 20 mm, the liquid surface is at a hi...

Embodiment 3

[0035] Embodiment 3 is a further embodiment on the basis of Embodiment 2, such as Figure 1 to Figure 5 shown.

[0036] The mixed airgel obtained after vacuum freezing is subjected to thermal reduction of graphene oxide at 150-250°C, the reduction is carried out at 5-1.5MPa, and the reducing atmosphere is air, nitrogen, inert gas, nitrogen / hydrogen mixed gas or inert gas / Hydrogen mixed gas; after reduction, graphene / activated carbon airgel is obtained, the thickness of graphene / activated carbon airgel is 2-20mm, and the airgel is pressed by a roller press, and the roller gap of the roller press is 1-20mm , to obtain a graphene / activated carbon composite film with a thickness of 1-20 mm.

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Abstract

The invention discloses a preparation method of a graphene / active carbon composite film. Active carbon is subjected to acid modification treatment, and is then mixed with a graphene oxide dispersion liquid, then the graphene / active carbon mixed solution is subjected to freezing treatment, then a solid mixture after freezing treatment is dried, thermal reduction of a graphene oxide is performed to obtain graphene / active carbon aerogel, finally a roller press or tablet press are adopted to mechanically press the graphene / active carbon aerogel to obtain a graphene / active carbon composite film, active carbon particles are uniformly dispersed in a graphene framework, and the film material has a self-supporting characteristic and has bendability. The preparation method can eliminate a re-stacking phenomenon in the graphene film preparation process, provides an efficient conductive carrier for active carbon, and the prepared composite film material can be separately used as a supercapcitor electrode under the condition of not adding a binder, and has relatively high specific capacitance and stable cycle performance.

Description

technical field [0001] The invention belongs to the technical field of supercapacitor electrode materials, and in particular relates to a preparation method of a graphene / activated carbon composite film and a supercapacitor electrode made of the graphene / activated carbon composite film obtained by the method. Background technique [0002] Supercapacitors have the characteristics of high power density, long cycle life, no pollution, and good safety performance. They have broad application prospects in electric vehicles, space technology, and defense industries, and have become a research hotspot that has attracted widespread attention in recent years. [0003] Carbon materials with high specific surface area are ideal electrode materials for supercapacitors, and activated carbon has been widely used in supercapacitors. In recent years, with the rapid development of portable electronic devices and new energy vehicles, the requirements for supercapacitors are also increasing. F...

Claims

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Application Information

Patent Timeline
22 Mar 2017
Publication
CN106531459A
IPC
H01G11/36; H01G11/34; H01G11/86
CPC
H01G11/34; H01G11/36; H01G11/86; Y02E60/13
Inventors
刘飞; 李文斌