Cobalt-nickel-double-metal-hydroxide-nanosheet/carbon-nitride-coated nitrogen-doped hollow graphene sphere composite material and preparation method thereof and application

A graphene ball and hydroxide technology, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of easy deformation or collapse of the structure, unsafe hidden dangers, etc., and achieve the effects of not easy to deform or collapse, high stability, and good flexibility.

Inactive Publication Date: 2019-02-01
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of these materials is prone to deformation or collapse during charging and discharging, and there are certain unsafe hazards.

Method used

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  • Cobalt-nickel-double-metal-hydroxide-nanosheet/carbon-nitride-coated nitrogen-doped hollow graphene sphere composite material and preparation method thereof and application
  • Cobalt-nickel-double-metal-hydroxide-nanosheet/carbon-nitride-coated nitrogen-doped hollow graphene sphere composite material and preparation method thereof and application
  • Cobalt-nickel-double-metal-hydroxide-nanosheet/carbon-nitride-coated nitrogen-doped hollow graphene sphere composite material and preparation method thereof and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Synthesis of cobalt-nickel double metal hydroxide nanosheets / carbon nitride-coated nitrogen-doped hollow graphene ball composite material (Co 1 Ni 1 LDH / CN x @NGHSs). The preparation process is like figure 1 As shown, including the following steps:

[0035] 1. Positively charged polystyrene beads made from styrene and polyvinylpyrrolidone;

[0036] 2. Polyaniline coated graphene spheres are prepared from polystyrene beads, graphene oxide, transition metal salts of iron and cobalt, melamine and aniline;

[0037] 3. Nitrogen-doped hollow graphene balls coated with carbon nitride are prepared from polyaniline coated graphene balls and melamine;

[0038] 4. Nitrogen-doped hollow graphene spheres coated with cobalt, nickel transition metal salts, urea and carbon nitride to prepare cobalt-nickel bimetal hydroxide nanosheets / nitrogen-doped hollow graphene spheres coated with carbon nitride Composite materials.

[0039] The specific preparation process is as follows:

[0040]...

Embodiment 2

[0052] The method is the same as in Example 1, except that: 2mL 2M Ni(NO 3 ) 2 And 0mL 2MCo(NO 3 ) 2 . Its Ni(OH) 2 / CN x @NGHSs specific surface area is 299m 2 / g such as Figure 5 As shown, the specific capacity at 1A / g current density is 1247F / g as Figure 4 Shown in curve 1.

Embodiment 3

[0054] The method is the same as in Example 1, except that: 1.34mL 2M Ni(NO 3 ) 2 And 0.67mL2M Co(NO 3 ) 2 . Co 1 Ni 2 LDH / CN x @NGHSs specific surface area is 281m 2 / g such as Figure 5 As shown, the specific capacity at 1A / g current density is 1631F / g as Figure 4 Curve 2 is shown.

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Abstract

The invention discloses a cobalt-nickel-double-metal-hydroxide-nanosheet/carbon-nitride-coated nitrogen-doped hollow graphene sphere composite material and a preparation method thereof, and application as a supercapacitor electrode material. The composite material comprises a cobalt-nickel-double-metal-hydroxide-nanosheet/carbon-nitride-coated nitrogen-doped hollow graphene sphere has a 3D spherical appearance; and the specific surface area is 100 to 1000m<2>/g and the average pore diameter of 1 to 200mm. In addition, the preparation method includes the following steps: preparing a small polystyrene sphere; preparing a polyaniline-coated graphene sphere; preparing a carbon-nitride-coated nitrogen-doped hollow graphene sphere; and preparing a cobalt-nickel-double-metal-hydroxide-nanosheet/carbon-nitride-coated nitrogen-doped hollow graphene sphere composite material. Therefore, a problem of series agglomeration of the cobalt-nickel double-metal hydroxide unit structure during the traditional preparation technology process is solved effectively; and a novel method is provided for preparing an electrode material with advantages of large specific surface area, high flexibility, high electric capacity, and high stability.

Description

Technical field [0001] The invention belongs to the technical field of electrode materials for new energy storage devices. More specifically, the invention relates to a cobalt-nickel double metal hydroxide nanosheet / carbon nitride coated nitrogen-doped hollow graphene ball composite material and a preparation method thereof And application. Background technique [0002] With the increasing shortage of petroleum resources, the declining reserves, and the increasing seriousness of a series of environmental problems caused by the use of fossil fuels, the development of efficient, low-cost and environmentally friendly energy conversion and storage devices has become a research hotspot in the field of resources and energy at home and abroad. Among them, supercapacitor is a new type of energy storage device between traditional capacitors and chemical batteries. It has the advantages of both, such as high power density, high energy density, long cycle life, high safety and reliability, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36
CPCH01G11/24H01G11/30H01G11/36Y02E60/13
Inventor 蒋仲庆郝晓琼
Owner ZHEJIANG SCI-TECH UNIV
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