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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 pow

Method used

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  • 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
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Example Embodiment

[0025] Example 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 ultrasonic dispersion (30 minutes), the solution was transferred to a 100ml autoclave and reacted at 180°C for 30 hours. When the reaction is over, centrifugation is used to obtain the solid product, ferric oxide nanoparticles.

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

[0028] (3) Centrifuge and dry the solution in step (2), mix the powder of ferric oxide-coated silica powder and polyvinylidene fluoride in a ratio of 2:1, mix and dissolve in N-methylpyrrolidone, and stir for 24 hours After vacuum drying;

[0029] ...

Example Embodiment

[0032] Example 2:

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

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

[0035] (3) Centrifuge and dry the solution in step (2), mix the powder of ferric oxide-coated silica powder and polyvinylidene fluoride at a ratio of 6:1, mix and dissolve in N-methylpyrrolidone, and stir for 10 hours Then vacuum dried.

[0036] (4) The powder obtained in step (3) is heat-treated in an argon atmosphere at 450°C for 180 minutes to obtain a composite structure of iron trioxide-coated silica-coated carbon.

[0037] (5) The powder of the composite structure obtained in step (4) is dissolved in a sodium hydroxide solution, silicon dioxide is removed, centrif...

Example Embodiment

[0038] Example 3:

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

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

[0041] (3) Centrifuge and dry the solution in step (2), mix the powder of ferric oxide-coated silica powder and polyvinylidene fluoride at a ratio of 3:1, mix and dissolve in N-methylpyrrolidone, and stir for 18 hours Then vacuum dried.

[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 trioxide-coated silica-coated carbon.

[0043] (5) The powder of the composite structure obtained in step (4) is dissolved in a sodium hydroxide solution, silicon dioxide is removed, centrifu...

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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

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Application Information

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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
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