Vanadium-doped nickel-cobalt double-metal hydroxide electrode material and preparation method thereof

A hydroxide and electrode material technology, which is applied in the manufacture of hybrid/electric double-layer capacitors, hybrid capacitor electrodes, etc., can solve the problems that nickel-cobalt double-metal hydroxide materials have not been reported, and achieve uniform size and simple preparation process. , the effect of doping amount controllable

Inactive Publication Date: 2021-10-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, vanadium doping of nickel-cobalt double metal hydroxide materials has not been reported.

Method used

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  • Vanadium-doped nickel-cobalt double-metal hydroxide electrode material and preparation method thereof
  • Vanadium-doped nickel-cobalt double-metal hydroxide electrode material and preparation method thereof
  • Vanadium-doped nickel-cobalt double-metal hydroxide electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Weigh 0.105g of nickel nitrate hexahydrate, 0.070g of cobalt nitrate hexahydrate, and 0.114g of urea powder into 60ml of a mixed solvent of methanol and water (the volume ratio of methanol and water is 1:1), and magnetically stir until the solution Clarified to obtain the first solution.

[0026] 2) Add 0.005 g of vanadium chloride into the first solution under ultrasonication or stirring to obtain a clear second solution.

[0027] 3) The second solution was transferred to a reaction kettle with a Teflon lining, and then the whole was placed in an oven, and kept at 150° C. for 12 hours, so as to heat-treat the second solution.

[0028] 4) Cool to room temperature after the heat treatment, centrifuge the reacted second solution to obtain a solid sample, and wash with water and ethanol three times respectively. The washed solid sample was dried in a vacuum oven at 60°C for 24 hours to obtain a vanadium-doped nickel-cobalt double hydroxide electrode material (NCV-LDH-5...

Embodiment 2

[0031] 1) Weigh 0.105g of nickel nitrate hexahydrate, 0.070g of cobalt nitrate hexahydrate, and 0.114g of urea powder into 60ml of a mixed solvent of methanol and water (the volume ratio of methanol and water is 1:1), and magnetically stir until the solution Clarified to obtain the first solution.

[0032] 2) Add 0.010 g of vanadium chloride into the first solution under ultrasound or stirring to obtain a clear second solution.

[0033] 3) The second solution was transferred to a reaction kettle with a Teflon lining, and then the whole was placed in an oven, and kept at 150° C. for 12 hours, so as to heat-treat the second solution.

[0034] 4) Cool to room temperature after the heat treatment, centrifuge the reacted second solution to obtain a solid sample, and wash with water and ethanol three times respectively. The washed solid sample was dried in a vacuum oven at 60°C for 24 hours to obtain a vanadium-doped nickel-cobalt double hydroxide electrode material (NCV-LDH-10). ...

Embodiment 3

[0036] 1) Weigh 0.105g of nickel nitrate hexahydrate, 0.070g of cobalt nitrate hexahydrate, and 0.114g of urea powder into 60ml of a mixed solvent of methanol and water (the volume ratio of methanol and water is 1:1), and magnetically stir until the solution Clarified to obtain the first solution.

[0037] 2) Add 0.015 g of vanadium chloride into the first solution under ultrasonication or stirring to obtain a clear second solution.

[0038] 3) The second solution was transferred to a reaction kettle with a Teflon lining, and then the whole was placed in an oven, and kept at 150° C. for 12 hours, so as to heat-treat the second solution.

[0039] 4) Cool to room temperature after the heat treatment, centrifuge the reacted second solution to obtain a solid sample, and wash with water and ethanol three times respectively. The washed solid sample was dried in a vacuum oven at 60°C for 24 hours to obtain a vanadium-doped nickel-cobalt double hydroxide electrode material (NCV-LDH-1...

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Abstract

The invention discloses a vanadium-doped nickel-cobalt double-metal hydroxide electrode material and a preparation method thereof. The preparation method specifically comprises the following steps: adding nickel nitrate hexahydrate, cobalt nitrate hexahydrate and urea into a mixed solvent of methanol and water, and stirring until the solution is clear to obtain a first solution; adding vanadium chloride into the first solution under an ultrasonic or stirring condition to obtain a clarified second solution; and carrying out heat treatment on the second solution, cooling to room temperature, centrifuging to obtain a solid product, and cleaning and drying to obtain the vanadium-doped nickel-cobalt double-metal hydroxide electrode material. According to the invention, the vanadium-doped nickel-cobalt double-metal hydroxide prepared by the method shows a three-dimensional nanoflower-shaped morphology, wherein the nanoflower is composed of a plurality of nanosheets which grow vertically and have the thickness of 10-15 nm; and the preparation method has the characteristics that the preparation process is simple, the size of the obtained nanosheet is uniform, and the doping amount of vanadium is controllable; and the prepared vanadium-doped nickel-cobalt double-metal hydroxide electrode material can be applied to a supercapacitor.

Description

technical field [0001] The invention belongs to the technical field of preparation of nickel-cobalt double-metal hydroxide electrode materials, and in particular relates to a vanadium-doped nickel-cobalt double-metal hydroxide electrode material and a preparation method thereof. Background technique [0002] Layered double hydroxide (LDH) is one of the research hotspots of supercapacitor electrode materials in recent years, among which nickel-cobalt double hydroxide exhibits excellent energy storage performance. But at the same time, the electrochemical kinetic process of LDH is relatively sluggish, and the electrochemical performance is greatly limited, and performance indicators such as specific capacity and rate performance have the potential to be further improved. Obtaining LDH materials with high capacity and excellent rate performance and cycle stability has always been a research hotspot in the field of supercapacitors. [0003] A series of studies have proved that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/86
CPCH01G11/30H01G11/86Y02E60/13
Inventor 苗继中支明佳洪樟连
Owner ZHEJIANG UNIV
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