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Magnesium-cobalt oxide/graphene composite material used as supercapacitor electrode material and preparation method thereof

A technology of supercapacitor and cobalt oxide, applied in the field of electrochemical energy, can solve the problems of low electric capacity of electric double layer capacitor electrode material, poor cycle stability and rate of goose capacitance, etc., achieve low cost, improve total capacitance, Penetration-enhancing effect

Active Publication Date: 2016-09-14
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems in the prior art such as the low capacitance of the electric double layer capacitor electrode material, poor cycle stability and rate performance of the electric double layer capacitor by compounding graphene and a metal oxide magnesium cobalt oxide , to provide a magnesium cobalt oxide / graphene composite material with high capacitance value, good rate capability and cycle stability

Method used

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  • Magnesium-cobalt oxide/graphene composite material used as supercapacitor electrode material and preparation method thereof
  • Magnesium-cobalt oxide/graphene composite material used as supercapacitor electrode material and preparation method thereof
  • Magnesium-cobalt oxide/graphene composite material used as supercapacitor electrode material and preparation method thereof

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Embodiment 1

[0027] The first step: 1) Graphene oxide was prepared by the Hume method using graphite as raw material, and the graphene oxide after pickling, alcohol washing, and drying was ground, and ultrasonically dispersed in deionized water to obtain a concentration of 2 mg / mL graphene oxide aqueous dispersion; 2) Weigh 190 mg (0.80 mmol) NiCl 2 ·6H 2 O, dispersed in 20 mL of the graphene oxide water dispersion obtained in 1), diluted with water to 80 mL, stirred evenly to fully dissolve; 3) After successive centrifugation, precipitation, deionized water washing, and drying, nickel ion modified modified graphene oxide, which was ground and dispersed in deionized water to obtain a 2 mg / mL modified graphene oxide solution.

[0028] The second step: the molar ratio of 2:1 Co(CH 3 COO) 2 4H 2 O and Mg(CH 3 COO) 2 4H 2 O was dissolved in dilute nitric acid to make 80 mL of Co 2+ and Mg 2+For a solution with a total concentration of 0.015 mol / L, 25 wt% ammonia water was added as an...

Embodiment 2

[0030] The first step: 1) Graphene oxide was prepared by the Hume method using graphite as raw material, and the graphene oxide after pickling, alcohol washing, and drying was ground, and ultrasonically dispersed in deionized water to obtain a concentration of 2 mg / mL graphene oxide aqueous dispersion; 2) Weigh 136 mg (0.80 mmol) CuCl 2 2H 2 O, dispersed in 20 mL of the graphene oxide aqueous dispersion obtained in 1), diluted with water to 80 mL, stirred evenly to fully dissolve; 3) successively centrifuged, precipitated, washed with deionized water, and dried to obtain the modified copper ion modified graphene oxide, which was ground and dispersed in deionized water to obtain a 2 mg / mL modified graphene oxide solution.

[0031] The second step: the molar ratio of 2:1 Co(CH 3 COO) 2 4H 2 O and Mg(CH 3 COO) 2 4H 2 O was dissolved in dilute nitric acid to make 80 mL of Co 2+ and Mg 2+ For a solution with a total concentration of 0.05 mol / L, use 25 wt% ammonia water as...

Embodiment 3

[0033] The first step: 1) Graphene oxide was prepared by the Hume method using graphite as raw material, and the graphene oxide after pickling, alcohol washing, and drying was ground, and ultrasonically dispersed in deionized water to obtain a concentration of 2 mg / mL graphene oxide aqueous dispersion; 2) Weigh 190 mg (0.80 mmol) CoCl 2 ·6H 2 O, dispersed in 20 mL of the graphene oxide aqueous dispersion obtained in 1), diluted with water to 80 mL, stirred evenly to fully dissolve; 3) After successive centrifugation, precipitation, deionized water washing, and drying, the cobalt ion modified The modified graphene oxide was finely ground and dispersed in deionized water to obtain a 2 mg / mL modified graphene oxide solution.

[0034] The second step: the molar ratio of 2:1 Co(CH 3 COO) 2 4H 2 O and Mg(CH 3 COO) 2 4H 2 O was dissolved in dilute nitric acid to make 80 mL Co 2+ and Mg 2+ For a solution with a total concentration of 0.10 mol / L, use 25 wt% ammonia water as a...

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Abstract

The invention discloses a magnesium-cobalt oxide / graphene composite material used as a supercapacitor material and a preparation method thereof. The composite material consists of nanoscale magnesium-cobalt oxide and graphene, the nanoscale magnesium-cobalt oxide is of a petal-shaped cluster structure, the graphene is lamellar, and the magnesium-cobalt oxide is covered with the graphene. The preparation method of the composite material comprises the following steps: (1) synthetizing modified oxidized graphene; (2) adding magnesium-cobalt salt and an alkali source in a modified oxidized graphene solution, and preparing a magnesium-cobalt hydroxide / graphene composite material through a hydrothermal reduction method; and (3) carrying out high-temperature calcination on the prepared magnesium-cobalt hydroxide / graphene composite material so as to prepare an MgCo2O4 / graphene composite material. Compared with an existing graphene composite electrode material, the MgCo2O4 / graphene composite material obtained by the invention has better structure characteristics, greater specific surface area, smaller mass transfer resistance and longer cycle life, and has good application prospect in the field of energy reserves.

Description

technical field [0001] The invention belongs to the field of electrochemical energy, in particular to a magnesium cobalt oxide / graphene composite supercapacitor electrode material and a preparation method thereof. Background technique [0002] As an emerging energy capture and storage device, supercapacitors are divided into electric double layer capacitors and faraday pseudocapacitors according to their energy storage mechanisms. The former stores energy based on the electric double layer on the electrode and electrolyte surface. The electrode materials are mostly carbon-based materials, such as activated carbon, carbon black, carbon nanotubes, graphene, carbon fibers, etc.; the latter is stored by the redox reaction of the active material on the electrode, or the underpotential deposition of metal ions on the electrode surface. Energy, currently commonly used materials are metal oxides (such as RuO2, MnO2, Fe3O4, Co3O4, etc.) and conductive polymers (such as polyaniline, p...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/36H01G11/46H01G11/24H01G11/86
CPCY02E60/13H01G11/30H01G11/24H01G11/36H01G11/46H01G11/86
Inventor 吕斌沙楚涵叶志镇
Owner ZHEJIANG UNIV
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