Preparation method of yolk-eggshell structured nitrogen-doped carbon-coated Fe3O4@SnO2 magnetic nanometer box

A technology of carbon-coated ferroferric oxide and magnetic nanometers, which is applied in nanotechnology, nanotechnology, structural parts, etc., can solve problems such as poor rate characteristics and cycle performance, limited commercial applications, and large volume effects, and achieves Good shape control, excellent cycle stability, and the effect of mitigating volume effects

Active Publication Date: 2016-08-31
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a negative electrode material, ferroferric oxide has inherent low conductivity, and defects such as large volume effect in the lithium i...

Method used

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  • Preparation method of yolk-eggshell structured nitrogen-doped carbon-coated Fe3O4@SnO2 magnetic nanometer box
  • Preparation method of yolk-eggshell structured nitrogen-doped carbon-coated Fe3O4@SnO2 magnetic nanometer box
  • Preparation method of yolk-eggshell structured nitrogen-doped carbon-coated Fe3O4@SnO2 magnetic nanometer box

Examples

Experimental program
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Effect test

Embodiment 1

[0027] 1. Preparation of Fe2O3 nanocubes:

[0028] Dissolve 80 mg of ferric chloride hexahydrate and 40 mg of solid sodium hydroxide in 90 mL of deionized water, mix well at 25 °C and transfer to a 150 mL polytetrafluoroethylene-lined hydrothermal reactor. Reaction at 100°C for 24h. After the reaction was completed, the reaction kettle was taken out, the red product was centrifuged and washed three times with deionized water and absolute ethanol, and finally dried in a vacuum drying oven for 12 hours. The resulting product is ferric oxide nanocubes.

[0029] 2. Preparation of core-shell structure ferric oxide@silica nanocubes:

[0030] Ultrasonically disperse 100 mg of the above-mentioned ferric oxide nano-cubic in 70 mL of absolute ethanol, and then add 6.5 mL of deionized water, 15 mg of ammonia water and 30 mg of tetraethyl orthosilicate (TEOS) in turn after the dispersion is uniform, at 30 °C Reacted for 2 h in a water bath. After the reaction, the product was centrifu...

Embodiment 2

[0036] 1. Preparation of Fe2O3 nanocubes:

[0037] Dissolve 80 mg of ferric chloride hexahydrate and 80 mg of solid sodium hydroxide in 90 mL of deionized water, mix well at 25°C and transfer to a 150 mL polytetrafluoroethylene-lined hydrothermal reaction kettle , 150°C for 36 h. After the reaction was over, the reaction kettle was taken out, the red product was centrifuged and washed three times with deionized water and absolute ethanol, and finally dried in a vacuum oven for 12 h. The resulting product is ferric oxide nanocubes.

[0038] 2. Preparation of core-shell structure ferric oxide@silica nanocubes:

[0039] Ultrasonically disperse 100 mg of the above-mentioned ferric oxide nanocubes in 70 mL of absolute ethanol, and after the dispersion is uniform, add 6.5 mL of deionized water, 18 mg of ammonia water and 50 mg of tetraethyl orthosilicate (TEOS), at 50 °C The reaction was carried out in a water bath for 6h. After the reaction, the product was centrifuged and washed...

Embodiment 3

[0045] 1. Preparation of Fe2O3 nanocubes:

[0046] Dissolve 80 mg of ferric chloride hexahydrate and 160 mg of solid sodium hydroxide in 90 mL of deionized water, mix well at 25 °C and transfer to a 150 mL polytetrafluoroethylene-lined hydrothermal reactor. Reaction at 180°C for 48h. After the reaction was over, the reaction kettle was taken out, the red product was centrifuged and washed three times with deionized water and absolute ethanol, and finally dried in a vacuum oven for 12 h. The resulting product is ferric oxide nanocubes.

[0047] 2. Preparation of core-shell structure ferric oxide@silica nanocubes:

[0048] Ultrasonically disperse 100 mg of the above-mentioned ferric oxide nanocubes in 70 mL of absolute ethanol, and after the dispersion is uniform, add 6.5 mL of deionized water, 80 mg of ammonia water and 200 mg of tetraethyl orthosilicate (TEOS) in sequence, at 80 °C Reacted for 12 h under water bath condition. After the reaction, the product was centrifuged...

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Abstract

The invention discloses a preparation method of a yolk-eggshell structured nitrogen-doped carbon-coated Fe3O4@SnO2 magnetic nanometer box, and belongs to the technical field of production of a nanometer material. The preparation method comprises the following steps of firstly, wrapping the surface of a Fe2O3 nanometer cube with a layer of silicon dioxide; secondly, forming a yolk-eggshell structured Fe2O3@SnO2 nanometer box under the effect of potassium stannate trihydrate and urea; and finally, coating dopamine, introducing a carbon source and a nitrogen source, carrying out calcination in an inertia atmosphere to form a conductive carbon layer, and simultaneously converting Fe2O3 to Fe3O4. The instrument equipment adopted by the invention is simple, the preparation cost is low, the operation process is simple and convenient, the required material during the reaction process is low toxic and is not harmful, the stoichiometric ratio of a multi-constituent material can be effectively controlled, and the high-quality yolk-eggshell structured magnetic nanometer material which is uniform in size, uniform in distribution and favorable in morphology control and can be used for industrial production at a large scale is obtained.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial production, and in particular relates to a preparation method of egg yolk-eggshell structured magnetic nanomaterials. Background technique [0002] Among transition metal oxides, Fe3O4 is considered to be the most practical anode material for lithium-ion batteries due to its high theoretical capacity, environmental friendliness, low cost, and abundant resources. However, as a negative electrode material, ferroferric oxide has inherent low conductivity, and defects such as large volume effect in the lithium ion intercalation / extraction process, resulting in poor rate characteristics and cycle performance, which greatly limits its commercialization. application. At present, the electrochemical performance is improved by synthesizing ferroferric oxide nanomaterials with special structure and designing and preparing ferroferric oxide composite materials. Contents of the invention [0003] The...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/48H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/48H01M4/52H01M4/62H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 陈铭张秀娥沈枭吴倩卉张鹏飞还龙
Owner YANGZHOU UNIV
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