Preparation method of polydopamine derived carbon-coated calcium vanadate nanosheet composite material

A carbon-coated calcium vanadate and polydopamine technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc. Excellent cycle stability, stable cycle performance, and the effect of large specific surface area

Inactive Publication Date: 2020-12-04
JILIN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fly in the ointment is that the three-dimensional nano-CaV 4 o 9 The first-cycle Coulombi

Method used

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  • Preparation method of polydopamine derived carbon-coated calcium vanadate nanosheet composite material
  • Preparation method of polydopamine derived carbon-coated calcium vanadate nanosheet composite material
  • Preparation method of polydopamine derived carbon-coated calcium vanadate nanosheet composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Take 0.05g CaCl 2 Dissolve 0.786g of vanadyl acetylacetonate in 22ml of absolute ethanol and 3ml of distilled water, and stir for one hour. After the system is uniform, transfer it to a 50ml reaction kettle. After washing with water and suction filtration, the precipitate was collected, and the precipitate was dried in a vacuum oven at 80°C for 3 hours, and the dried solid was pulverized in a mortar and collected for later use.

[0029] 2) Preparation of 50ml Tris solution with pH 8.5: Dissolve 0.7268g Tris in 50ml deionized water, measure the pH with a pH meter, adjust the pH to 8.5 with 6ml / L HCl .

[0030] 3) Take 0.2g CaV 4 o 9 Dissolve in 50ml Tris solution, wait for CaV 4 o 9 After being evenly dispersed in the Tris solution, 0.05 g of dopamine hydrochloride was added, and the solution was stirred for 12 hours after mixing. Then, it was washed with deionized water, centrifuged, and the solid was dried in a vacuum oven at 60° C. for 12 hours, and the black ...

Embodiment 2

[0033] 1) Take 0.05g CaCl 2 Dissolve 0.786g of vanadyl acetylacetonate in 22ml of absolute ethanol and 3ml of distilled water, and stir for one hour. After the system is uniform, transfer it to a 50ml reaction kettle. After washing with water and suction filtration, the precipitate was collected, and the precipitate was dried in a vacuum oven at 80°C for 3 hours, and the dried solid was pulverized in a mortar and collected for later use.

[0034] 2) Preparation of 50ml Tris solution with pH 8.5: Dissolve 0.7268g Tris in 50ml deionized water, measure the pH with a pH meter, adjust the pH to 8.5 with 6ml / L HCl .

[0035] 3) Take 0.2g CaV 4 o 9 Dissolve in 50ml Tris solution, wait for CaV 4 o 9 After being uniformly dispersed in the Tris solution, 0.05 g of dopamine hydrochloride was added, and the solution was stirred for 10 hours after mixing. Then, it was washed with deionized water, centrifuged, and the solid was dried in a vacuum oven at 60° C. for 12 hours, and the black...

Embodiment 3

[0037] 1) Take 0.05g CaCl 2 Dissolve 0.786g of vanadyl acetylacetonate in 22ml of absolute ethanol and 3ml of distilled water, and stir for one hour. After the system is uniform, transfer it to a 50ml reaction kettle. After washing with water and suction filtration, the precipitate was collected, and the precipitate was dried in a vacuum oven at 80° for 3 hours, and the dried solid was ground in a mortar and collected for later use.

[0038] 2) Preparation of 50ml Tris solution with pH 8.5: Dissolve 0.7268g Tris in 50ml deionized water, measure the pH with a pH meter, adjust the pH to 8.5 with 6ml / L HCl .

[0039] 3) Take 0.2g CaV 4 o 9 Dissolve in 50ml Tris solution, wait for CaV 4 o 9 After being uniformly dispersed in the Tris solution, 0.075 g of dopamine hydrochloride was added, and the solution was stirred for 10 hours after mixing. Then, it was washed with deionized water, centrifuged, and the solid was dried in a vacuum oven at 60° C. for 12 hours, and the black s...

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Abstract

The invention discloses a preparation method of a polydopamine derived carbon-coated calcium vanadate nanosheet composite material, belongs to the technical field of lithium ion battery and sodium ionbattery electrode materials, and aims to solve the problems that the first-circle coulombic efficiency of three-dimensional nano CaV4O9 is relatively low and the stability is poor in a relatively long charge-discharge cycle process. The preparation method comprises the following steps of performing hydrothermal reaction on calcium chloride and vanadyl acetylacetonate to generate calcium vanadate,preparing a Tris solution, adding the calcium vanadate into a mixed solution of dopamine hydrochloride and Tris, performing polymerization coating, and finally performing constant-temperature calcination to obtain the nitrogen-doped carbon-coated CaV4O9 composite material. The composite process is simple in method, forms a composite structure, increases the specific surface area and pore size distribution, is beneficial to improving the electrochemical performance, is environment-friendly, and can be suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of electrode materials for lithium-ion batteries and sodium-ion batteries, and relates to a polydopamine-derived carbon-coated calcium vanadate nanosheet (CaV 4 o 9 @PDA-C) The application of the preparation method of composite materials in lithium-ion batteries and sodium-ion batteries. Specifically, it relates to using nitrogen-doped carbon composite calcium vanadate as an electrode material for lithium-ion batteries and sodium-ion batteries. Background technique [0002] The use of non-renewable resources such as fossil fuels (such as coal, oil, and natural gas) for energy-related production activities has caused serious economic and environmental problems worldwide. Under the increasingly prominent energy crisis, how to find and utilize new energy sources, especially renewable energy sources, has become a major challenge for all mankind. Solar energy, wind energy, etc. are currently the most widely us...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5825H01M4/583H01M4/625H01M10/0525H01M10/054Y02E60/10
Inventor 聂平赵翠梅林丽常立民徐天昊薛向欣王海瑞
Owner JILIN NORMAL UNIV
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