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A kind of vanadium nitride nanosheet flexible composite electrode material and its preparation method and application

A vanadium nitride nano-composite electrode technology, which is applied in the direction of nitrogen compounds, chemical instruments and methods, and hybrid capacitor electrodes, can solve the problems of poor capacitance performance and cycle stability of supercapacitors, and achieve improved utilization of active materials and good capacitance. performance, excellent cycle stability

Active Publication Date: 2021-05-18
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem of poor capacitance performance and cycle stability of existing supercapacitor electrode materials, the present invention provides a vanadium nitride nanosheet flexible composite electrode material and its preparation method and application

Method used

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  • A kind of vanadium nitride nanosheet flexible composite electrode material and its preparation method and application
  • A kind of vanadium nitride nanosheet flexible composite electrode material and its preparation method and application
  • A kind of vanadium nitride nanosheet flexible composite electrode material and its preparation method and application

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Embodiment 1

[0039] A flexible composite electrode material of vanadium nitride nanosheets, with carbon cloth as the substrate, vanadium nitride uniformly grows on the carbon cloth fibers and forms a porous nanosheet layer with a three-dimensional structure on the surface of the carbon cloth fibers, in which vanadium nitride grows The diameter of a single carbon cloth fiber in the nano sheet layer is 15-20 μm, and the thickness of the vanadium nitride nano sheet flexible composite electrode material is 0.35-0.5 mm.

[0040] Transition metal nitrides have similar electrochemical properties to ruthenium oxide and can exhibit high capacitance at high scan rates due to their high electrical conductivity and fast reversible redox process. Among them, vanadium nitride has a high specific capacitance—1340F / g -1 , Excellent conductivity—1.67×10 6 S / m and wide electrochemical window, it is a very potential anode material for supercapacitors, which is expected to replace commercial electrode materi...

Embodiment 2

[0043] A preparation method of vanadium nitride nanosheet flexible composite electrode material, comprising the steps of:

[0044] Step 1. Preparation of vanadium sulfide / carbon cloth precursor:

[0045]Prepare thioacetamide, deionized water, ammonia water and ammonium metavanadate according to a certain molar volume ratio, add thioacetamide to deionized water, stir until thioacetamide is completely dissolved, add ammonia water and ammonium metavanadate in turn, Continue stirring at a certain stirring speed for a certain period of time to obtain a mixed solution, and pour the mixed solution into a high-pressure reactor for subsequent use;

[0046] Fix the carbon cloth on the polytetrafluoroethylene sheet and put it into the autoclave, seal the autoclave and raise the temperature from room temperature to 160°C within a certain period of time. Rinse with water and ethanol, and dry the cleaned sample to obtain the vanadium sulfide / carbon cloth precursor;

[0047] Step 2. Prepar...

Embodiment 3

[0050] A preparation method of vanadium nitride nanosheet flexible composite electrode material, comprising the steps of:

[0051] Step 1. Preparation of vanadium sulfide / carbon cloth precursor:

[0052] Prepare thioacetamide, deionized water, ammonia water and ammonium metavanadate according to the molar volume ratio of 12~16mmol:35mL:2mL:2mmol, wherein thioacetamide, ammonia water and ammonium metavanadate are of analytical grade, with a purity> 99.0%;

[0053] Add thioacetamide into deionized water, stir until thioacetamide is completely dissolved, add ammonia water and ammonium metavanadate in turn, and continue stirring at a stirring speed of 100-500r / min for 40-60min to obtain a mixed solution. During the stirring process , the color of the solution changes from white to yellow and then gradually turns black, and the mixed solution is poured into a high-pressure reactor for subsequent use;

[0054] Use Teflon tape to fix the 1cm×3cm carbon cloth on the polytetrafluoroe...

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Abstract

The invention relates to a vanadium nitride nanosheet flexible composite electrode material and a preparation method and application thereof, belonging to the technical field of supercapacitor electrode materials. In order to solve the problem of poor capacitive performance and cycle stability of existing supercapacitor electrode materials, the present invention provides a flexible composite electrode material of vanadium nitride nanosheets, which uses carbon cloth as a substrate and undergoes hydrothermal synthesis and high-temperature nitriding Reduction grows vanadium nitride on the surface of carbon cloth fibers and forms a porous nanosheet with a three-dimensional structure, which is conducive to the diffusion of electrolyte, electron transport and fast electrochemical reaction, so that the material has good capacitance performance and cycle stability sex. The electrode material has no conductive agent and binder, and integrates nanometerization, planarization, integration and flexibility, which greatly improves the conductivity of the electrode and the diffusion kinetics of ions. Applying it to supercapacitors can make supercapacitors The negative electrode of the capacitor has extremely high conductivity, ductility and good cycle stability.

Description

technical field [0001] The invention belongs to the technical field of supercapacitor electrode materials, and in particular relates to a vanadium nitride nanosheet flexible composite electrode material and a preparation method and application thereof. Background technique [0002] With the rapid growth of population and the rapid development of society, human's demand for energy is increasing day by day. As we all know, the main way for human beings to obtain energy is through the burning of fossil fuels. However, the burning of a large amount of fossil fuels will be accompanied by problems such as resource depletion and environmental pollution. Therefore, the development of clean and efficient new energy sources and the vigorous development of energy storage and conversion technologies are considered to be the most effective ways to alleviate the energy and ecological crisis. At present, energy storage devices such as supercapacitors, lithium-ion batteries, and fuel cells...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/26H01G11/30H01G11/24H01G11/68H01G11/70H01G11/86C01B21/06B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B21/0617H01G11/24H01G11/26H01G11/30H01G11/68H01G11/70H01G11/86Y02E60/13
Inventor 陈明华范鹤梁心琪陈庆国
Owner HARBIN UNIV OF SCI & TECH
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