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Preparation method and application of nickel sulfide/graphene composite material

A composite material and graphene technology, applied in the field of electrochemical materials, can solve the problems of poor rate capability and cycle stability, unsatisfactory interaction of components, and low utilization rate of specific surface area, so as to achieve a simple and easy process and easy industrialized mass production. , shape controllable effect

Inactive Publication Date: 2019-07-30
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally speaking, the specific capacitance and energy density of transition metal sulfides are higher than those of graphene, but the material conductivity is low, resulting in poor rate and cycle stability.
In addition, graphene sheets are easy to stack, and nickel sulfide is easy to agglomerate, resulting in low utilization of specific surface area, which is not conducive to electrolyte infiltration and thus affects electrochemical performance.
In summary, a single type of electrode material will be limited in the practical application of supercapacitors.
[0005] At present, there are related works on the application of graphene / nickel sulfide composite materials in supercapacitors, but most of the preparation methods are to prepare graphene by redox method, and then load nickel sulfide by hydrothermal or electrochemical deposition methods. Is not in place, the interaction between the components is not ideal, or cannot be mass-produced

Method used

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  • Preparation method and application of nickel sulfide/graphene composite material
  • Preparation method and application of nickel sulfide/graphene composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Expand the expanded graphite with an expansion rate of 1000 at 900°C to obtain graphite worms, then mix the graphite worms in deionized water at a mass ratio of 10:90, and perform high-speed shearing at a speed of 2200rpm for preliminary exfoliation. Shearing time is 50min. Then, the homogeneous exfoliation was carried out by a high-pressure homogenizer with a pressure setting of 800 bar, and the homogenization time was 60 minutes to obtain a graphene slurry. Put the graphene slurry into a freeze drier for 4 hours and freeze it at -45°C, then vacuum-dry it for 48 hours to obtain graphene powder;

[0032] 2) Dissolve nickel chloride hexahydrate in deionized water to form a solution with a concentration of 0.05 mol / L, add 0.1 mol / L of the graphene powder in step 1), and stir for 20 min at a rotational speed of 800 rpm. Then add 0.3mol / L thiourea to the above dispersion, and continue to stir at 800rpm for 20min until uniform;

[0033] 3) Put the mixed liquid in step 2...

Embodiment 2

[0036] 1) Expand graphite with an expansion rate of 300 at 1200°C to obtain graphite worms, then mix the graphite worms in deionized water at a mass ratio of 1:99, and perform high-speed shearing at a speed of 1200rpm for preliminary exfoliation. The cutting time is 40min. Then, the homogeneous exfoliation was carried out by a high-pressure homogenizer with a pressure setting of 400 bar, and the homogenization time was 30 minutes to obtain a graphene slurry. Put the graphene slurry in a freeze dryer for 6 hours and freeze it at -42°C, then vacuum-dry it for 72 hours to obtain graphene powder;

[0037] 2) Dissolve nickel chloride hexahydrate in deionized water to form a solution with a concentration of 0.1 mol / L, add 0.1 mol / L graphene powder in step 1), and stir for 20 min at a rotational speed of 800 rpm. Then add 0.2mol / L thiourea to the above dispersion, and continue to stir at 800rpm for 20min until uniform;

[0038]3) Put the mixed liquid in step 2) into the polytetrafl...

Embodiment 3

[0041] 1) Expand graphite with an expansion rate of 1500 at a high temperature of 800°C to obtain graphite worms, then mix the graphite worms in deionized water at a mass ratio of 20:50, and perform high-speed shearing at a speed of 2500rpm for preliminary exfoliation. The shearing time is 120min. Then, the homogeneous exfoliation was carried out by a high-pressure homogenizer with a pressure setting of 1600 bar, and the homogenization time was 80 minutes to obtain a graphene slurry. Put the graphene slurry into a freeze dryer and freeze for 3 hours at a temperature of -46°C, then vacuum-dry for 12 hours to obtain graphene powder;

[0042] 2) Dissolve nickel chloride hexahydrate in deionized water to form a solution with a concentration of 0.05 mol / L, add 0.1 mol / L of the graphene powder in step 1), and stir for 20 min at a rotational speed of 800 rpm. Then add 0.05mol / L thiourea to the above dispersion, and continue to stir at 800rpm for 20min until uniform;

[0043] 3) Put...

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Abstract

The invention discloses a preparation method and application of a nickel sulfide / graphene composite material, and relates to the field of electrochemical materials. The graphite is exfoliated to formgraphene, and nickel sulfide is grown at the surface of the graphene by employing a microwave method. Nickel sulfide nanostructures in the prepared composite material are uniformly distributed at thesurface of the graphene, are tightly connected with a graphene sheet layer and are stable in structure. The electrochemical test data of the composite material show that the synergistic effect of thenickel sulfide and the graphene enables the composite material to develop the advantages of the nickel sulfide and the graphene, so that a supercapacitor electrode material with the advantages of lowimpedance, high specific capacitance, high cycling stability and the like is obtained. The electrode material is high in preparation efficiency, simple in process, safe and environment-friendly, and has potential application value in industrial production of the supercapacitor.

Description

technical field [0001] The invention relates to the technical field of electrochemical materials, in particular to a preparation method and application of a nickel sulfide / graphene composite material. Background technique [0002] With the continuous research and development of various advanced electronic products, the development of clean, efficient, and recyclable energy storage and conversion devices has received more and more attention. As a new energy storage device between traditional capacitors and chemical batteries, supercapacitors have great application potential in the fields of electronic power due to their advantages such as high power density, fast charge and discharge characteristics, long cycle life and high safety. . [0003] The core of a supercapacitor is mainly composed of electrode materials, current collectors, electrolytes, and separators, among which electrode materials are one of the most critical factors affecting electrochemical performance and co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/36H01G11/24H01G11/86
CPCH01G11/24H01G11/30H01G11/36H01G11/86Y02E60/13
Inventor 杨国伟刘心悦王建兴
Owner SUN YAT SEN UNIV
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