Preparation method of modified cobalt vanadate material and supercapacitor

A cobalt vanadate and modified technology, which is used in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, can solve problems such as poor cycle performance, and achieve the effects of increasing contact area, improving cycle performance and high specific capacitance.

Pending Publication Date: 2022-04-29
HUBEI UNIV OF ARTS & SCI
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  • Abstract
  • Description
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Problems solved by technology

[0005] The main purpose of the present invention is to propose a preparation method of a modified cobalt vanadate material and a supercapacitor, aiming to solve the problem of poor cycle performance when the existing cobalt vanadate material is used as an electrode material for a supercapacitor

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  • Preparation method of modified cobalt vanadate material and supercapacitor
  • Preparation method of modified cobalt vanadate material and supercapacitor
  • Preparation method of modified cobalt vanadate material and supercapacitor

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[0040] The invention provides a preparation method of modified cobalt vanadate material, which aims to provide an electrode material with good cycle performance and high specific capacitance. In one embodiment, the preparation method comprises the following steps:

[0041] Step S10: dissolve cobalt nitrate hexahydrate and nickel nitrate hexahydrate in deionized water to obtain a mixed solution. Under stirring conditions, add complexing agent, surfactant and ammonium metavanadate solution to the mixed solution to obtain a reaction solution. Move the reaction solution into a hydrothermal reactor and react at 1101100 ℃ for 11110 hours to obtain a solid-liquid mixture.

[0042] Specifically, cobalt nitrate hexahydrate and nickel nitrate hexahydrate are dissolved in deionized water to obtain the mixed solution. Under the stirring of magnetic stirrer, complexing agent and surfactant are added. After magnetic stirring for 0.5 hours, ammonium metavanadate solution is added and stirred for...

Embodiment 1

[0062] (1) Add 1.13g ammonium metavanadate into 50ml deionized water, stir with a magnetic stirrer at a stirring rate of 300 rpm, heat in a water bath at 10 ℃ for 0.5h, and dissolve to obtain ammonium metavanadate solution.

[0063] (1) Dissolve 1.31g of cobalt nitrate hexahydrate and 0.15g of nickel nitrate hexahydrate in 10ml deionized water to obtain the mixed solution. Stir with a magnetic stirrer at a stirring rate of 300 rpm, then add 1.11g of citric acid monohydrate and 0.15g of sodium dodecyl sulfate. After magnetic stirring for 0.5 hours, add the above ammonium metavanadate solution, add deionized water to make the total volume of the solution 150ml, and continue stirring for 3 hours, The reaction solution (that is, the concentration of ammonium metavanadate in the reaction solution is 0.07mol / l), and the molar ratio of each component added in the reaction solution is cobalt nitrate hexahydrate: nickel nitrate hexahydrate: citric acid monohydrate: sodium dodecyl sulfate: ...

Embodiment 2

[0068] (1) Add 1.11g ammonium metavanadate into 50ml deionized water, stir with a magnetic stirrer at a stirring rate of 100 rpm, heat in a water bath at 10 ℃ for 1 hour, and dissolve to obtain ammonium metavanadate solution.

[0069] (1) Dissolve 1.17g cobalt nitrate hexahydrate and 0.15g nickel nitrate hexahydrate in 10ml deionized water to obtain the mixed solution. Stir with a magnetic stirrer at a stirring rate of 300 rpm, add 3.35g citric acid monohydrate and 0.13g sodium dodecyl sulfate, and add the above ammonium metavanadate solution after magnetic stirring for 0.5 hours. Add deionized water to make the total volume of the solution 150ml, and continue stirring for 4 hours, The reaction solution (that is, the concentration of ammonium metavanadate in the reaction solution is 0.11mol / l), and the molar ratio of each component added in the reaction solution is cobalt nitrate hexahydrate: nickel nitrate hexahydrate: citric acid monohydrate: sodium dodecyl sulfate: ammonium met...

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Abstract

The invention discloses a preparation method of a modified cobalt vanadate material and a supercapacitor. The preparation method comprises the following steps: S10, dissolving cobalt nitrate hexahydrate and nickel nitrate hexahydrate in water to obtain a mixed solution, adding a complexing agent, a surfactant and an ammonium metavanadate solution into the mixed solution to obtain a reaction solution, transferring the reaction solution into a hydrothermal reaction kettle, and reacting at 1101100 DEG C for 11110 hours to obtain a solid-liquid mixture; s10, carrying out solid-liquid separation on the solid-liquid mixture, and calcining the obtained solid at 5001500 DEG C to obtain nickel-doped cobalt vanadate; s30, crushing the nickel-doped cobalt vanadate, adding the crushed nickel-doped cobalt vanadate into a mixed solvent to obtain a solution A, adding tetraethoxysilane and a nitric acid solution into the solution A, and reacting to obtain a solution B; and S40, separating out a precipitate in the solution B, and calcining at 4501550 DEG C to obtain the modified cobalt vanadate material. Through the combined action of coating modification and doping modification, the prepared modified cobalt vanadate material is good in cycle performance and high in specific capacitance.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a preparation method of modified cobalt vanadate material and a supercapacitor. Background technology [0002] Supercapacitor, also known as electrochemical capacitor, is an energy storage device between traditional capacitor and traditional battery. It has the characteristics of long service life, good reversibility, fast charge and discharge speed and high output power. It is a good supplementary power supply and can be well used in many power devices. [0003] Supercapacitor is mainly composed of collector, electrode, electrolyte and diaphragm. Electrode material is the key factor to determine the performance of supercapacitor. At present, the electrode materials of supercapacitors mainly include carbon materials, conductive polymers and transition metal oxides. They mainly rely on electric double layers and redox pseudo capacitive charges to store electric energy. Tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/30
CPCH01G11/86H01G11/30
Inventor 崔萍范红红
Owner HUBEI UNIV OF ARTS & SCI
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