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A kind of graphene/carbon nanotube/nickel electrode, its preparation method and application

A carbon nanotube and graphene technology, applied in the field of electrochemical materials, can solve the problems of affecting the power density of supercapacitors, increasing the equivalent series resistance of electrodes, and complex electrode sheet processes, achieving good performance complementarity and reducing equivalent series. Resistance, the effect of short time

Active Publication Date: 2015-11-25
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional process of preparing electrode sheets is relatively complicated, and the addition of a certain binder increases the equivalent series resistance of the electrode and affects the power density of the supercapacitor.

Method used

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  • A kind of graphene/carbon nanotube/nickel electrode, its preparation method and application
  • A kind of graphene/carbon nanotube/nickel electrode, its preparation method and application
  • A kind of graphene/carbon nanotube/nickel electrode, its preparation method and application

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preparation example Construction

[0020] A kind of preparation method of graphene / carbon nanotube / nickel electrode, such as figure 1 shown, including the following steps:

[0021] Step S1, adding graphite oxide and carbon nanotubes with a mass ratio of 1 to 2:1 into an alcohol solvent (such as ethanol, isopropanol, propanol), ultrasonically dispersing for 0.5 to 2 hours, and then stirring at room temperature for 0.5 to 1 hour to obtain a uniform A mixed solution of dispersed graphene oxide and carbon nanotubes;

[0022] Step S2, adding concentration to the mixed solution in step S1 is the magnesium nitrate (Mg(NO) of 0.2~0.5mg / ml 3 ) 2 ·6H 2 O), ultrasonically stirred for 15 to 60 minutes, then inserted into the mixed solution in parallel with two nickel foil electrodes with a spacing of 0.5 cm, and added 40 to 80 V direct current between the two electrodes, electrophoresed for 5 to 20 minutes, and graphite oxide was obtained at the negative electrode ene / carbon nanotube / nickel electrodes;

[0023] Step S...

Embodiment 1

[0031] (1) Add 20g of 50-mesh graphite powder with a purity of 99.5%, 10g of potassium persulfate and 10g of phosphorus pentoxide into concentrated sulfuric acid at 80°C, stir evenly, cool for more than 6h, wash until neutral, and dry; Add the sample to 0°C, 230mL of concentrated sulfuric acid, then add 60g of potassium permanganate, keep the temperature of the mixture below 20°C, then keep it in an oil bath at 35°C for 2h, then slowly add 920mL of deionized water; after 15min, Then add 2.8L of deionized water, then add 50mL of 30wt% hydrogen peroxide solution, wait until the color of the mixture turns bright yellow, suction filter while it is hot, then wash with 5L of 10% hydrochloric acid, suction filter, and heat at 60°C Vacuum drying for 48 hours to obtain graphite oxide

[0032] (2) Add graphite oxide and acid-treated carbon nanotubes into ethanol solvent in a ratio of 1:1 by mass, ultrasonicate for 0.5h, and stir at room temperature for 0.5h to obtain a uniformly dispers...

Embodiment 2

[0037] (1) is identical with (1) in embodiment 1;

[0038] (2) Add graphene oxide and acid-treated carbon nanotubes into isopropanol solvent at a mass ratio of 1:1, ultrasonicate for 2 hours, and stir at room temperature for 1 hour to obtain a uniformly dispersed mixed solution of graphene oxide and carbon nanotubes ;

[0039] (3) Adding concentration of 0.2mg / ml Mg(NO 3 ) 2 ·6H 2 O, sonicate for 15 minutes to obtain a uniform solution as the electrolyte, use a nickel foil with a diameter of 5 cm as the electrode, place it in the electrolyte in parallel and symmetrically, add a direct current of 80V to both ends of the electrode, and the distance between the two electrodes is 0.5cm, electrophoresis 20min, you can get graphene oxide / carbon nanotube / nickel electrode;

[0040] (4) Dry the graphene oxide / carbon nanotube / nickel electrode obtained in (3) naturally, slowly heat up to 800°C for 3 hours under the protection of argon, and take it out after naturally cooling to room ...

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Abstract

The invention belongs to the field of electrochemical materials, and discloses a grapheme / carbon nano tube / nickel electrode and a preparation method thereof. The preparation method of the composite material comprises the following steps: a graphene oxide and carbon nano tube mixed solution is prepared; a graphite oxide / carbon nano tube / nickel electrode is prepared through electrophoresis; and the grapheme / carbon nano tube / nickel electrode is prepared. The invention provides the preparation method of the grapheme / carbon nano tube / nickel electrode; as the graphite oxide / carbon nano tube material is directly deposited on an electrode plate, a complicated coating process can be omitted, the process is simple, and the time is short; in addition, equivalent series resistance (ESR) of the graphite oxide / carbon nano tube / nickel electrode is reduced, so that the power density of a super capacitor is increased more efficiently.

Description

technical field [0001] The invention relates to the field of electrochemical materials, in particular to a graphene / carbon nanotube / nickel electrode, its preparation method and application. Background technique [0002] Andre K. Geim of the University of Manchester in the United Kingdom prepared graphene materials in 2004, which have attracted widespread attention due to their unique structure and photoelectric properties. Single-layer graphite is considered an ideal material due to its large specific surface area, excellent electrical and thermal conductivity, and low thermal expansion coefficient. Such as: 1, high strength, Young's molar weight, (1,100GPa), breaking strength: (125GPa); 2, high thermal conductivity, (5,000W / mK); 3, high electrical conductivity, carrier transport rate, ( 200,000cm 2 / V*s); 4, high specific surface area, (theoretical calculation value: 2,630m 2 / g). In particular, its high conductivity, large specific surface properties and its two-dimens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042H01M4/133
CPCY02E60/122Y02E60/13Y02E60/10
Inventor 周明杰吴凤王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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