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Method for preparing electrode material for graphene/manganese dioxide thin-film asymmetrical supercapacitor

A supercapacitor, manganese dioxide technology, applied in capacitors, electrolytic capacitors, circuits, etc., can solve the problems of graphene/manganese dioxide thin film asymmetric supercapacitor electrode materials, increasing the quality and cost of supercapacitors, etc. , to achieve the effect of high flexibility, high energy density and power density, and broad application prospects

Inactive Publication Date: 2014-07-02
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above-prepared manganese dioxide / graphene composite materials are all in powder state, and the preparation of supercapacitors needs to add 15% to 40% of conductive agents and binders, which greatly increases the quality and cost of supercapacitors.
[0005] There is no report on graphene / manganese dioxide thin film asymmetric supercapacitor electrode materials

Method used

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  • Method for preparing electrode material for graphene/manganese dioxide thin-film asymmetrical supercapacitor
  • Method for preparing electrode material for graphene/manganese dioxide thin-film asymmetrical supercapacitor
  • Method for preparing electrode material for graphene/manganese dioxide thin-film asymmetrical supercapacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Weigh 0.05g of graphite oxide and disperse it into 100mL of ultrapure water for 1h, centrifuge at 3000r / min for 30min to remove unexfoliated graphite oxide, remove the supernatant, add 0.05g of hydrazine hydrate and 1g of ammonia water, stir magnetically for 15min, and then The beaker containing the solution was placed in an oil bath, and kept at 95°C for 1 hour to obtain a black dispersion, which was filtered and washed with ultrapure water for 6 times, freeze-dried and then ground to obtain a graphene powder. Weigh 0.27g of manganese chloride tetrahydrate and disperse it into 50mL of isopropanol, ultrasonically disperse for 30 minutes, add it into a three-necked flask, place it in an oil bath at 83°C under mechanical stirring, condense and reflux for 30 minutes, take out the obtained brownish-yellow dispersion, and centrifuge at a speed of Wash 4 times with ethanol and 4 times with ultrapure water under the condition of 7000r / min for 10min, dry and grind to obtain mang...

Embodiment 2

[0043] Weigh 0.05g of graphite oxide and disperse it into 50mL of ultrapure water for 1h by ultrasonic dispersion, centrifuge at 2000r / min for 40min to remove unexfoliated graphite oxide, remove the supernatant, add 0.1g of hydrazine hydrate and 0.7g of ammonia water, stir magnetically for 10min, then The beaker containing the solution was placed in an oil bath, and kept at 100°C for 1 hour to obtain a black dispersion, filtered and washed with ultrapure water for 10 times, freeze-dried and then ground to obtain graphene powder. Weigh 0.17g of manganese sulfate monohydrate and disperse it into 100mL of isopropanol, ultrasonically disperse it for 15min, add it into a three-neck flask, place it in an oil bath at 83°C under mechanical stirring, condense and reflux for 10min, take out the obtained brownish-yellow dispersion, and centrifuge at 8500r The manganese dioxide powder was obtained by washing with ethanol for 3 times and ultrapure water for 6 times at a time of 5 minutes, a...

Embodiment 3

[0046] Weigh 0.025g of graphite oxide and disperse it into 100mL of ultrapure water for 2h by ultrasonic dispersion, centrifuge at 3500r / min for 15min to remove unexfoliated graphite oxide, remove the supernatant, add 0.125g of hydrazine hydrate and 0.25g of ammonia water, stir magnetically for 60min, then The beaker containing the solution was placed in an oil bath, and kept at 90°C for 2 hours to obtain a black dispersion, which was filtered and washed with ultrapure water for 8 times, freeze-dried and then ground to obtain a graphene powder. Weigh 0.17g of manganese carbonate and disperse it into 50mL of isopropanol, ultrasonically disperse it for 40min, add it into a three-neck flask, place it in an oil bath at 83°C under mechanical stirring, condense and reflux for 40min, take out the obtained brownish-yellow dispersion, and centrifuge at 7000r / min Washing with ethanol for 6 times and ultrapure water for 3 times under the condition of 15 minutes, drying and grinding to obt...

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Abstract

The invention relates to a method for preparing an electrode material for a graphene / manganese dioxide thin-film asymmetrical supercapacitor, which comprises the following steps of: (1) dispersing graphite oxides into ultrapure water, then sequentially carrying out ultrasonic processing and centrifugation on the obtained mixture, taking supernatant fluid, adding hydrazine hydrates and ammonia water as a reducing agent into the supernatant fluid, then stirring the obtained object, and carrying out heat preservation on the stirred mixture for 1-2 hours at the temperature of 90-100 DEG C so as to obtain graphene powder; (2) dispersing manganese salts into an isopropyl alcohol solution, carrying out ultrasonic processing on the obtained object, and then carrying out reflux condensation on the obtained object at the temperature of 80-85 DEG C so as to obtain manganese dioxide powder; and (3) dispersing the graphene powder into ultrapure water so as to prepare a graphene dispersion, dispersing the manganese dioxide powder into ultrapure water so as to obtain a manganese dioxide dispersion, and finally, sequentially carrying out stratified suction filtration on the graphene dispersion and the manganese dioxide dispersion so as to obtain the electrode material. The method disclosed by the invention is simple in preparation process, and a prepared electrode material for a supercapacitor is good in chemical stability and high in specific capacitance and has a flexible structure, therefore, the method has broad application prospects.

Description

technical field [0001] The invention belongs to the field of preparation of supercapacitor materials, in particular to a method for preparing a graphene / manganese dioxide film asymmetric supercapacitor electrode material. Background technique [0002] Manganese dioxide is widely used as a battery electrode material and an oxidation catalyst material because of its wide resources, low price, environmental friendliness, and excellent electrical conductivity. The electrode material used for supercapacitors has only been developed in recent years. It exhibits good capacitance characteristics in neutral electrolytes. The maximum theoretical specific capacitance reaches 1370F / g, and the potential window is wide, which can be achieved in aqueous electrolytes. 1V voltage has become a research hotspot in recent supercapacitor electrode materials. [0003] Graphene is a new type of material that can be obtained by reducing graphite oxide. Since the discovery of graphene by the resea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 李耀刚邵元龙王宏志张青红
Owner DONGHUA UNIV
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