Preparation and application of nickel-based three-dimensional graphene/manganese dioxide composite material

A technology of manganese dioxide and composite materials, which is applied in the manufacture of hybrid/electric double-layer capacitors, hybrid capacitor electrodes, electrical components, etc., can solve the problem of not completely solving the limitations of graphene and manganese dioxide, large contact resistance of electrodes, and difficulty in scaling In order to achieve the effect of improving electrochemical characteristics, improving contact points, and avoiding the increase of internal resistance

Inactive Publication Date: 2020-07-28
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] However, the above-mentioned preparation method is relatively complicated, the conditions are harsh, and it is not easy to produce on a large scale, and it does not completely solve the limitations of graphene and manganese dioxide in the use process
In recent years, researchers have proposed many methods to solve the above problems, and combining it with carbon materials is one of the simplest and most effective strategies; in view of the defects of the material itself and the shortcomings of existing technologies, it is difficult for existing technologies to combine graphite with excellent performance Optimal use of ene in the field of energy storage, and at the same time solve the key problems in the use of manganese dioxide materials
Moreover, most of the existing methods for preparing electrodes are to mix the active material with binder, conductive agent, solvent and other substances in the form of powder to prepare slurry, and then apply the slurry to the current collector (aluminum foil, copper foil) The electrode is prepared on the surface. The electrode prepared by this method increases the internal resistance of the electrode material due to the introduction of the binder, and the currently used current collector is a material with metal properties that has poor contact compatibility with the electrode material, which makes the electrode produce less Large contact resistance, which greatly affects the performance of power supply characteristics
[0017] Therefore, in view of the above key problems, the present invention proposes a preparation method of a nickel-based three-dimensional graphene-manganese dioxide composite electrode material, and applies the prepared electrode material to a supercapacitor to break through its high specific energy and high specific power performance performance bottleneck

Method used

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  • Preparation and application of nickel-based three-dimensional graphene/manganese dioxide composite material
  • Preparation and application of nickel-based three-dimensional graphene/manganese dioxide composite material
  • Preparation and application of nickel-based three-dimensional graphene/manganese dioxide composite material

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Embodiment 1

[0045] A preparation method of a nickel-based three-dimensional graphene / manganese dioxide composite material, comprising the steps of:

[0046] 1) Dissolve sucrose in deionized water, prepare a sucrose solution with a concentration of 0.5mol / L and place it in a quartz boat, use foamed nickel as a base to immerse in the sucrose solution, and transfer the entire quartz boat into a chemical vapor deposition furnace , in a nitrogen atmosphere, chemical vapor deposition at 700 ° C for 1 h, and carbonization of sucrose in a high-temperature inert gas atmosphere, so that graphene carbon materials can be grown on the nickel-based surface in situ, that is, the nickel-based three-dimensional interconnected network structure graphene is obtained ;

[0047] 2) Use nickel-based three-dimensional interconnected network structure graphene as a conductive substrate, place it in a high-pressure reactor, and add 0.01mol / L KMnO to the high-pressure reactor 4 The solution is completely immersed...

Embodiment 2

[0050] A preparation method of a nickel-based three-dimensional graphene / manganese dioxide composite material, comprising the steps of:

[0051] 1) Dissolve glucose in deionized water, prepare a glucose solution with a concentration of 1.2mol / L and place it in a quartz boat, use nickel foam as a substrate to immerse in the glucose solution, and transfer the entire quartz boat into a chemical vapor deposition furnace , in an argon atmosphere, chemical vapor deposition at 500°C for 0.5h, glucose carbonization in a high-temperature inert gas atmosphere, so that graphene carbon materials can be grown in situ on the nickel-based surface, that is, a nickel-based three-dimensional interconnected network structure is obtained Graphene;

[0052] 2) Use nickel-based three-dimensional interconnected network structure graphene as a conductive substrate and place it in a high-pressure reactor, and add 1mol / L KMnO to the high-pressure reactor 4 Solution until the conductive substrate is co...

Embodiment 3

[0055] A preparation method of a nickel-based three-dimensional graphene / manganese dioxide composite material, comprising the steps of:

[0056]1) Dissolve polyvinyl alcohol in deionized water, prepare a polyvinyl alcohol solution with a concentration of 2mol / L and place it in a quartz boat, use foamed nickel as a base to immerse in the polyvinyl alcohol solution, and transfer the entire quartz boat into In a chemical vapor deposition furnace, in a nitrogen atmosphere, chemical vapor deposition is carried out at 800°C for 3 hours, and polyvinyl alcohol is carbonized in a high-temperature inert gas atmosphere, so that it grows graphene carbon material on the surface of the nickel base, that is, the nickel base Three-dimensional interconnected network structure graphene;

[0057] 2) The nickel-based three-dimensional interconnected network structure graphene is used as the conductive substrate and placed in a high-pressure reactor, and 3mol / L KMnO is added to the high-pressure r...

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Abstract

The invention belongs to the technical field of energy storage materials and particularly relates to preparation and application of a nickel-based three-dimensional graphene/manganese dioxide composite material. The preparation method includes steps that foamed nickel serves as a template, an organic carbon source serves as a raw material, graphene grows on the foamed nickel in situ through a chemical vapor deposition method, and nickel-based three-dimensional intercommunicated network structure graphene is prepared; nickel-based three-dimensional intercommunicated network structure graphene is taken as a conductive substrate, in-situ growth of manganese dioxide on a surface of the conductive substrate is performed by utilizing a hydrothermal reaction method to prepare a nickel-based three-dimensional intercommunicated network structure graphene/manganese dioxide composite material in a wet state, washing with the water is performed to be neutral, and freeze drying is performed to obtain the nickel-based three-dimensional intercommunicated network structure graphene/manganese dioxide composite material. The nickel-based three-dimensional graphene/manganese dioxide composite material is used as a working electrode of a supercapacitor.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and in particular relates to the preparation and application of a nickel-based three-dimensional graphene / manganese dioxide composite material. Background technique [0002] As a new type of energy storage device, supercapacitor has ultra-high power density (>10 5 W / kg), ultra-high power output in a short period of time, good reversibility, fast charge and discharge performance (<60s), ultra-long cycle stability (>10 5 Times), wide working range (-70 ~ 60 ℃) and other advantages. Supercapacitors can play a very important role in consumer electronics, new energy vehicles, motion control, smart grid, industrial energy saving and emission reduction, military weapons and equipment, etc. However, energy density, a key indicator for evaluating energy storage devices, severely limits the large-scale application of supercapacitors (energy density of supercapacitors < 10Wh / k...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/46H01G11/86H01M4/36H01M4/50H01M4/62H01M4/131H01M4/1391
CPCH01G11/24H01G11/30H01G11/36H01G11/46H01G11/86H01M4/131H01M4/1391H01M4/362H01M4/502H01M4/62H01M4/625Y02E60/10Y02E60/13
Inventor 廖敏会刘力王储陈晓涛刘江涛石斌邹睿
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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