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Preparation method of egg yolk‑eggshell structure nitrogen-doped carbon-coated ferric oxide@tin dioxide magnetic nanobox

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: 2018-03-13
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 ion intercalation / extraction process, resulting in poor rate characteristics and cycle performance, which greatly limits its commercialization. application

Method used

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  • Preparation method of egg yolk‑eggshell structure nitrogen-doped carbon-coated ferric oxide@tin dioxide magnetic nanobox
  • Preparation method of egg yolk‑eggshell structure nitrogen-doped carbon-coated ferric oxide@tin dioxide magnetic nanobox
  • Preparation method of egg yolk‑eggshell structure nitrogen-doped carbon-coated ferric oxide@tin dioxide magnetic nanobox

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Preparation of Fe2O3 nanocubes:

[0028] Dissolve 80mg of ferric chloride hexahydrate and 40mg of solid sodium hydroxide in 90mL of deionized water, mix well at 25°C and transfer to a 150 mL polytetrafluoroethylene-lined hydrothermal reactor at 100°C Reaction 24h. 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.

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

[0030] Ultrasonic disperse 100 mg of the above-mentioned iron sesquioxide nano-cubic in 70 mL of absolute ethanol. After the dispersion is uniform, add 6.5 mL of deionized water, 15 mg of ammonia water and 30 mg of tetraethyl orthosilicate (TEOS), in a water bath at 30 °C Under the reaction 2h. After the reaction, the product was centrifuged and washed three times with dei...

Embodiment 2

[0036] 1. Preparation of Fe2O3 nanocubes:

[0037] Dissolve 80mg of ferric chloride hexahydrate and 80mg of solid sodium hydroxide in 90mL of deionized water, mix well at 25°C and transfer to a 150 mL polytetrafluoroethylene-lined hydrothermal reactor at 150°C React 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] Ultrasonic disperse 100 mg of the above 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), in a water bath at 50 °C Under the reaction 6h. After the reaction, the product was centrifuged and washed three times with deionized wate...

Embodiment 3

[0045] 1. Preparation of Fe2O3 nanocubes:

[0046] Dissolve 80mg of ferric chloride hexahydrate and 160mg of solid sodium hydroxide in 90mL of deionized water, mix well at 25°C and transfer to a 150 mL polytetrafluoroethylene-lined hydrothermal reaction kettle at 180°C Reaction 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] Ultrasonic 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 a water bath at 80 °C Under reaction for 12 h. After the reaction, the product was centrifuged and washed three tim...

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Abstract

The preparation method of egg yolk-eggshell structure nitrogen-doped carbon-coated ferric oxide@tin dioxide magnetic nano box belongs to the field of nanomaterial production technology. A layer of silicon dioxide is coated on the surface of ferric oxide cubic nano cubes, and then Under the action of potassium stannate trihydrate and urea, an egg yolk-eggshell structure ferric oxide@tin dioxide nanobox is formed, and finally dopamine is coated, carbon and nitrogen sources are introduced, and calcined in an inert atmosphere to form a conductive carbon layer, while converting ferric oxide to ferric oxide. The equipment adopted in the present invention is simple, the preparation cost is low, the operation process is simple and convenient, the materials required in the reaction process are low-toxic and harmless, and the stoichiometric ratio of multi-component materials can be effectively controlled to obtain uniform size, uniform distribution and good shape. Well-controlled, it can be used for industrial mass production of high-quality egg yolk-eggshell structured magnetic nanomaterials.

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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Patent Type & Authority Patents(China)
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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