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Preparation method and application of a sea urchin-like vanadium-based nano-electrode material

A nano-electrode and sea urchin-like technology, which is applied in the field of preparation of sea urchin-like vanadium-based nano-electrode materials, can solve the problems of soft template removal, achieve good controllability, and improve the effect of mechanical strength and crystal structure

Active Publication Date: 2018-01-05
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to synthesize products with specific morphology, it is necessary to control the anisotropic growth of crystals, so most methods either use vanadyl triisopropoxide (VOT), vanadyl acetylacetonate (VO(acac)2) or acetyl Vanadium acetonate (V(acac)3) is used as a raw material; or surfactants such as polyvinylpyrrolidone (PVP), hexadecylamine (HDA) or CTAB need to be added as soft templates, but there are problems such as soft template removal, or It is synthesized by complex electrodeposition method, and there are some defects

Method used

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  • Preparation method and application of a sea urchin-like vanadium-based nano-electrode material
  • Preparation method and application of a sea urchin-like vanadium-based nano-electrode material
  • Preparation method and application of a sea urchin-like vanadium-based nano-electrode material

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Embodiment 1

[0034] Embodiment 1: one, a kind of preparation method of sea urchin shape vanadium-based nano-electrode material, comprises the steps:

[0035] 1) Add 4mmolV 2 o 5 (purity is 99%) join 32.64mL mass concentration and be 10% H 2 o 2 Solution, in 25 ℃ water bath electromagnetic stirring 2h, obtains transparent bright red vanadium precursor solution (V V ); Wherein, mass concentration is 10% hydrogen peroxide solution and adopts 10.88mL mass concentration to be 30% H 2 o 2 Solution mixed with 21.76mL deionized water;

[0036] 2) Measure 6mL of vanadium precursor solution into a 50mL beaker, then add 17mL of ethylene glycol (EG) and 17mL of deionized water, and finally add 3mmol of (NH 4 ) 2 SO 4 , magnetic stirring for 10min to mix the solution (the pH of the mixed solution is 2.5);

[0037] 3) After the stirring is completed, transfer the solution to a 50mL hydrothermal reaction kettle, seal it and put it in a dry box for a hydrothermal reaction at 180°C for 24 hours, a...

Embodiment 2

[0046] Embodiment 2: one, a kind of preparation method of sea urchin shape vanadium-based nano-electrode material, comprises the steps:

[0047] 1) Add 4mmolV 2 o 5 (purity is 99%) join 32.64mL mass concentration and be 10% H 2 o 2 Solution, in 25 ℃ water bath electromagnetic stirring 2h, obtains transparent bright red vanadium precursor solution (V V ); Wherein, mass concentration is 10% hydrogen peroxide solution and adopts 10.88mL mass concentration to be 30% H 2 o 2 Solution mixed with 21.76mL deionized water;

[0048] 2) Measure 5mL of vanadium precursor solution into a beaker, then add 15mL of ethylene glycol (EG) and 20mL of deionized water, and finally add 3mmol of (NH 4 ) 2 SO 4 , magnetic stirring for 10min to mix the solution (the pH of the solution is 2.5);

[0049] 3) After the stirring is completed, transfer the solution to a hydrothermal reaction kettle, seal it and put it in a dry box for hydrothermal reaction at 200°C for 24 hours, and air cool to roo...

Embodiment 3

[0058] Embodiment 3: one, a kind of preparation method of sea urchin shape vanadium-based nano-electrode material, comprises the steps:

[0059] 1) Add 4mmolV 2 o 5 (purity is 99%) join 32.64mL mass concentration and be 20% H 2 o 2 Solution, in 25 ℃ water bath electromagnetic stirring 2h, obtains transparent bright red vanadium precursor solution (V V); Wherein, mass concentration is 20% hydrogen peroxide solution and adopts 21.76mL mass concentration to be 30% H 2 o 2 Solution mixed with 10.88mL deionized water;

[0060] 2) Measure 6mL of vanadium precursor solution into the beaker, then add 17mL of ethylene glycol (EG) and 17mL of deionized water, and finally add 5mmol of (NH 4 ) 2 SO 4 , adjust the pH of the solution to 2.0 with 1M dilute sulfuric acid, and stir the solution for 10 minutes with electromagnetic stirring;

[0061] 3) After the stirring is completed, transfer the solution to a hydrothermal reaction kettle, seal it and put it in a dry box for hydrother...

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Abstract

The invention discloses a preparation method and application of a sea urchin-shaped vanadium-based nano-electrode material. First, vanadium pentoxide is added into a hydrogen peroxide solution, and a vanadium precursor solution is prepared by electromagnetic stirring in a water bath; and then the vanadium precursor solution, Ethylene glycol and deionized water were added, and ammonium sulfate was added to control the pH of the solution to 2.0~3.0. After mixing the solution with electromagnetic stirring, it was transferred to a hydrothermal reactor for hydrothermal reaction at 160~200 °C for 5~48 h; It is obtained by centrifugation, washing and drying; it is also disclosed that the sea urchin-shaped vanadium-based nano-electrode material is mixed with a binder and a conductive agent in a weight ratio of 70-80:20-10:10, and is coated on the current collector to prepare a electrode pads. The invention uses V2O5 with a lower price as the vanadium source, does not need any surfactant, the preparation process is simple, efficient, stable and economical, and the heat treatment has little influence on the change of the material morphology. Both electrolytes have high specific capacity and long cycle life.

Description

technical field [0001] The invention belongs to the technical field of electrode materials for supercapacitors, and in particular relates to a preparation method and application of a sea urchin-shaped vanadium-based nanometer electrode material. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, have the advantages of high power density, fast charge and discharge speed, and long cycle life. They are energy storage devices with great application potential and can be a good supplement to the power density of lithium-ion batteries. However, the "low energy density" characteristic of supercapacitors seriously restricts its practical application. According to the energy density formula E=1 / 2CV of supercapacitors 2 (C is the specific capacity, V is the voltage), it can be seen that improving the specific capacity of the electrode material is an important way to improve its energy density. [0003] According to different energy storage mechani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/46H01G11/30H01G11/24
CPCY02E60/13
Inventor 李鸿乂汪亮魏闯李新禄谢兵王雨
Owner CHONGQING UNIV
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