Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of iron trioxide/carbon yolk-eggshell nano-composite structure

A ferric oxide and nano-composite technology, which is applied in the field of composite materials, can solve the problems of matrix material pulverization, low electrical conductivity, and drastic volume changes of ferric oxide, and achieve the effect of alleviating volume expansion and reducing costs

Active Publication Date: 2013-07-17
ZHEJIANG UNIV
View PDF4 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a negative electrode material, it has two obvious disadvantages like other metal oxides: one is that its volume changes very drastically during charge and discharge, and the volume expansion causes the pulverization of the matrix material and the loss of contact with the current collector.
Second, the conductivity is very low
Bulk FeCl 3 ·6H 2 O was ground into a powder, and then the powdered FeCl 3 ·6H 2 Carbonization reaction of O with urea and cyclodextrin powder under solvothermal conditions, the prepared magnetic nanocomposite has a core-shell structure, ferroferric oxide is the core, and the carbon layer is coated on the surface of the core, and the carbon coating is amorphous. Carbon, its surface contains hydroxyl groups, and this scheme does not introduce nanostructured ferric oxide into the composite material, and there is still the problem of drastic volume change when ferric oxide is used as the negative electrode material

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of iron trioxide/carbon yolk-eggshell nano-composite structure
  • Preparation method of iron trioxide/carbon yolk-eggshell nano-composite structure
  • Preparation method of iron trioxide/carbon yolk-eggshell nano-composite structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of ferric oxide nanoparticles: 0.404g of ferric nitrate nonahydrate and 0.6g of polypropylene pyrrolidone (PVP) were dissolved in 52ml of N,N dimethylformamide (DMF). After uniform ultrasonic dispersion (30 minutes), the solution was transferred to a 100ml autoclave, and reacted at 180°C for 30 hours. After the reaction is finished, centrifuge to obtain nanoparticles of solid product ferric oxide.

[0027] (2) Disperse the nanoparticles of ferric oxide in alcohol, then add a certain proportion (5:1) of water and ammonia water, stir evenly, add tetraethyl orthosilicate and the mass ratio of ferric oxide nanoparticles is 2:1, adjust the pH value to 9, the reaction temperature is 20°C, and react for 24 hours;

[0028] (3) The solution in step (2) is centrifuged and dried, the powder of ferric oxide coated with silicon dioxide and polyvinylidene fluoride are mixed in a ratio of 2:1, dissolved in N-methylpyrrolidone, and stirred for 24 hours After vacuum dr...

Embodiment 2

[0033] (1) Preparation of Fe2O3 nanoparticles, the preparation method is the same as Example 1.

[0034] (2) Disperse the nanoparticles of ferric oxide in alcohol, then add a certain proportion (4:1) of water and ammonia water, stir evenly, add tetraethyl orthosilicate and the mass ratio of ferric oxide nanoparticles is 1:1, the pH value was adjusted to 11, the reaction temperature was 30°C, and the reaction was carried out for 10 hours.

[0035] (3) The solution in step (2) was centrifuged and dried, and the powder of ferric oxide coated with silicon dioxide and polyvinylidene fluoride was mixed in a ratio of 6:1, dissolved in N-methylpyrrolidone, and stirred for 10 hours Then vacuum dry.

[0036] (4) Heat-treat the powder obtained in step (3) in an argon atmosphere at 450° C. for 180 minutes to obtain a composite structure of iron sesquioxide wrapped in silicon dioxide wrapped in carbon.

[0037] (5) Dissolving the powder of the composite structure obtained in step (4) in ...

Embodiment 3

[0039](1) Preparation of Fe2O3 nanoparticles, the preparation method is the same as Example 1.

[0040] (2) Disperse the nanoparticles of ferric oxide in alcohol, then add a certain proportion (5:1) of water and ammonia water, stir evenly, add tetraethyl orthosilicate and the mass ratio of ferric oxide nanoparticles is 5:1, the pH value was adjusted to 8, the reaction temperature was 10°C, and the reaction was carried out for 18 hours.

[0041] (3) The solution in step (2) was centrifuged and dried, and the powder of ferric oxide coated with silicon dioxide and polyvinylidene fluoride was mixed in a ratio of 3:1, dissolved in N-methylpyrrolidone, and stirred for 18 hours Then vacuum dry.

[0042] (4) The powder obtained in step (3) is heat-treated in an argon atmosphere at 400° C. for 180 minutes to obtain a composite structure of iron sesquioxide wrapped in silicon dioxide wrapped in carbon.

[0043] (5) Dissolving the powder of the composite structure obtained in step (4) ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of an iron trioxide / carbon yolk-eggshell nano-composite structure. The preparation method includes taking iron trioxide nano-particles as centers, controlling thickness of coated silica through controlling quantity of ethyl orthosilicate, coating a layer of carbon outside silica through a thermal decomposition method, and obtaining the iron trioxide / carbon yolk-eggshell nano-composite structure by removing the silica in the middle layer. With the preparation method, the iron trioxide / carbon yolk-eggshell nano-composite structure is composited through simple coating processes, production cost is reduced and mass production can be realized; and besides, the hollow iron trioxide / carbon yolk-eggshell nano-composite structure is beneficial for improving performance of lithium ion battery negative electrode materials.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a method for preparing a ferric oxide / carbon egg yolk-eggshell nanocomposite structure. Background technique [0002] Generally, graphite-like carbon materials are used as anode materials for lithium batteries, which have a major impact on battery performance. As a negative electrode material, Fe2O3 has the advantages of high theoretical capacity, abundant content, low cost and environmental friendliness, and is considered to be one of the ideal substitutes for commercial graphite-like carbon materials. However, as a negative electrode material, it has two obvious disadvantages like other metal oxides: one is that its volume changes very drastically during charge and discharge, and the volume expansion causes the pulverization of the matrix material and the loss of contact with the current collector. . Second, the conductivity is very low. These two factors lead to their poo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01B31/02C01G49/06H01M4/36H01M4/48B82Y30/00B82Y40/00C01B32/05
CPCY02E60/10
Inventor 张辉刘杰杜宁杨德仁
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com