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Method for assembling capacitor with graphene nanosheets

A technology of graphene nanosheets and capacitors, which is applied in the manufacture of hybrid/electric double layer capacitors, etc., can solve the problems of high process requirements, high energy consumption, and affecting the electrochemical performance of capacitors, and achieve the effect of reasonable ratio

Inactive Publication Date: 2015-05-06
QINGDAO TAIHAODA CARBON MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphene with high specific surface area and excellent conductivity will be an ideal electrode material for supercapacitors, which can increase the power and energy of supercapacitors. However, the preparation of graphene nanosheets in the prior art requires high technology and high energy consumption. Graphene is used to prepare capacitors. , it is necessary to strictly control the process parameters, otherwise it will affect the electrochemical performance of the capacitor

Method used

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Embodiment

[0013] The method for assembling a capacitor with graphene nanosheets of the present embodiment comprises the following steps: (1) preparing graphite oxide: graphite powder is mixed with H2SO4 and NaNO3 and stirred evenly, and KMnO4 is added in an ice-water bath, and then the mixed solution is placed in a 40° C. In a water bath, stir and react for 15 minutes, add deionized water and continue stirring for 30 minutes, then add deionized water at a temperature of 60 °C to dilute, then add H2O2 solution with a mass fraction of 30%, filter, wash, and vacuum dry after reaction Graphite oxide was prepared; (2) Graphene nanosheets were prepared: the prepared graphite oxide was placed in a programmable air atmosphere muffle furnace preheated to 250°C for about 10 min, and the graphite oxide was thermally exfoliated at a low temperature to obtain graphene Nanosheets; (3) Mix graphene, conductive carbon black, and PTFE emulsion with a mass fraction of 50% in a mass ratio of 80:8:5, add ab...

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Abstract

The invention discloses a method for assembling a capacitor with graphene nanosheets. The method comprises the following steps: flake graphite is oxidized and dried; graphene nanosheets are prepared through thermal exfoliation under the conditions of low temperature and atmospheric pressure; and grapheme, conductive carbon black and PTFE emulsion with a mass fraction of 50% are mixed at a mass ratio of 80: 8: 5, absolute ethyl alcohol is added to the mixture and the mixture is stirred, the mixture is heated to break the emulsion, drying is carried out at the temperature of 50 DEG C to prepare electrode sheets, and the dried electrode sheets are assembled into a capacitor by adopting a special diaphragm for capacitors and using 6mol / L KOH solution as electrolyte. The ratio of grapheme, conductive carbon black and binder is reasonable, and the prepared capacitor has good performance and large specific capacitance.

Description

[0001] technical field [0002] The invention belongs to the technical field of graphite application, and in particular relates to a method for assembling a capacitor with graphene nanosheets. [0003] Background technique [0004] Carbonaceous materials have the advantages of high specific surface area, good electrical conductivity, good chemical stability in electrolyte, and low price. Graphene with high specific surface area and excellent conductivity will be an ideal electrode material for supercapacitors, which can increase the power and energy of supercapacitors. However, the preparation of graphene nanosheets in the prior art requires high technology and high energy consumption. Graphene is used to prepare capacitors. , the process parameters need to be strictly controlled, otherwise the electrochemical performance of the capacitor will be affected. [0005] Contents of the invention [0006] In order to overcome the above-mentioned technical problems existing in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/84H01G11/86
CPCY02E60/13H01G11/84H01G11/86
Inventor 乔帅
Owner QINGDAO TAIHAODA CARBON MATERIAL