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Supercapacitor-used nickel vanadate material, preparation method thereof and application

A supercapacitor, nickel vanadate technology, applied in chemical instruments and methods, hybrid capacitor electrodes, vanadium compounds, etc., can solve the problems of poor conductivity and surface permeability, few reactive sites, low cycle retention rate, etc., to achieve Low electrochemical impedance, good capacitance retention, and high product purity

Active Publication Date: 2019-10-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, due to the small specific surface area, poor conductivity and surface permeability, and few reactive active sites, regular tetragonal prism nickel vanadate has problems such as low specific capacitance and low cycle retention when used as an electrode material for supercapacitors.

Method used

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  • Supercapacitor-used nickel vanadate material, preparation method thereof and application
  • Supercapacitor-used nickel vanadate material, preparation method thereof and application
  • Supercapacitor-used nickel vanadate material, preparation method thereof and application

Examples

Experimental program
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Effect test

Embodiment 1

[0047] 4 mmol NH 4 VO 3 Completely dissolved in the solvent, the solvent is an aqueous solution of ethanol, the volume ratio of ethanol to water is 0.5:1; after ultrasonic treatment for 30 minutes, add 6 mmol Ni (NO 3 ) 2 ·6H 2 O, to obtain the reaction precursor. Adjust the pH to about 9 with a basic structure-directing agent (ethanolamine aqueous solution), and continue stirring in a water bath for 20 min to obtain a reaction mixture. Transfer the reaction mixture to a 100 mL Teflon-lined stainless steel autoclave. After heating and maintaining at 150° C. for 10 hours, it was naturally cooled to room temperature. After centrifugal separation, the synthesized substance was washed several times with deionized water and ethanol, and dried in a vacuum oven at 60° C. for 16 hours to obtain solid nickel vanadate.

[0048] Weigh the nickel vanadate material, acetylene black and PVDF prepared above at a mass ratio of 8:1:1, mix and grind, add a few drops of N-methylpyrrolidone...

Embodiment 2

[0057] 4 mmol NH 4 VO 3 It is completely dissolved in a solvent, the solvent is an aqueous solution of ethanol, and the volume ratio of ethanol to water is 1:1. After sonication for 30 min, 6 mmol Ni(NO 3 ) 2 ·6H 2 O. Adjust the pH value to about 7 with a basic structure-directing agent (ethanolamine aqueous solution), and continue stirring in a water bath for 20 min. Transfer the resulting mixture into a 100 mL Teflon-lined stainless steel autoclave. After heating and maintaining at 150° C. for 10 hours, it was naturally cooled to room temperature. The solid and liquid were separated, and the synthesized substance was washed several times with deionized water and ethanol, and dried in a vacuum oven at 70° C. for 12 hours to obtain solid nickel vanadate. The solid powder is tested by SEM, and the structure is block particles.

Embodiment 3

[0059] 3 mmol NH 4 VO 3 It is completely dissolved in a solvent, the solvent is an aqueous solution of ethanol, and the volume ratio of ethanol to water is 0.3:1. After sonication for 30 min, 6 mmol Ni (NO 3 ) 2 ·6H 2 O. Adjust the pH value to about 8 with a basic structure-directing agent (ethanolamine aqueous solution), and continue stirring in a water bath for 20 min. Transfer the resulting mixture into a 100 mL Teflon-lined stainless steel autoclave. After heating and maintaining at 150° C. for 10 hours, it was naturally cooled to room temperature. Solid-liquid separation, the synthesized substance was washed several times with deionized water and ethanol, and dried in a vacuum oven at 70° C. for 24 hours to obtain nickel vanadate solid. The solid powder is tested by SEM, and the structure is a uniformly dispersed lamellar structure.

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Abstract

The invention discloses a supercapacitor-used nickel vanadate material preparation method, which comprises steps: 1, ammonium vanadate is dissolved in a solvent, nickel nitrate is added, and a reaction precursor solution is obtained; 2, a basic structure directing agent is used to adjust the pH value of the reaction precursor solution to 7 to 12, and by uniform mixing, a reaction mixed solution isobtained; and 3, the reaction mixed solution is transferred to an autoclave, reaction for 8 to 15 h under 100 to 180 DEG C is carried out, and a product nickel vanadate material is obtained. A one-step hydrothermal method is adopted, multiple alkaline reagents are used as structure directing agents, the nickel vanadate material is obtained through adjusting the pH, the operation is simple and safe, the cost is low, and the product purity is high. The invention also discloses a flower-like nickel vanadate material, the material presents a flower-like structure with lamellar layers, the specific surface area is large, the conductivity and the surface permeability are good, and multiple reactive sites exist. The invention also discloses application of the flower-like nickel vanadate materialas a supercapacitor electrode material, the specific capacitance is high, capacity retention and rate performance are good, and the electrochemical impedance is low.

Description

technical field [0001] The invention relates to the technical field of double metal oxide electrode materials, in particular to a nickel vanadate material for supercapacitors, its preparation method and application. Background technique [0002] In recent years, the growing energy demand and environmental concerns urgently require the development of environmentally friendly energy and energy storage devices. As a new type of electrochemical energy storage device, supercapacitors have attracted widespread attention due to their outstanding electrochemical properties such as superior power density, fast charge-discharge capability, and excellent cycle stability. According to different energy storage mechanisms, supercapacitors are generally divided into two categories, namely electric double layer capacitors (EDLC) and pseudocapacitors. The materials of EDLC are mostly carbon materials, such as activated carbon, carbon nanotubes, graphene, etc., which store energy by forming ...

Claims

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Application Information

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IPC IPC(8): H01G11/46H01G11/24C01G31/00
CPCC01G31/00C01P2002/72C01P2004/03C01P2004/04C01P2006/12C01P2006/17H01G11/24H01G11/46Y02E60/13
Inventor 高云芳张晏徐新
Owner ZHEJIANG UNIV OF TECH
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