Graphene-coated mesoporous metallic oxide, and preparation method and use thereof

A technology of alkene-coated mesoporous and mesoporous silica, applied in the field of nanocomposite materials and electrode materials, can solve the problems of poor cycle performance, low charge and discharge rate, etc., to improve charge and discharge capacity, improve cycle performance and rate performance effect

Inactive Publication Date: 2012-05-02
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since its composition has not changed, the mesoporous Co 3 o 4 Still have problems such as low charge and discharge rate and poor cycle performance
However, there have been no reports on mesoporous metal oxides loaded with graphene

Method used

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  • Graphene-coated mesoporous metallic oxide, and preparation method and use thereof
  • Graphene-coated mesoporous metallic oxide, and preparation method and use thereof
  • Graphene-coated mesoporous metallic oxide, and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Preparation of mesoporous silica SBA-15 template

[0031] 4.0g triblock copolymer P123 (EO 20 PO 70 EO 20 ) was dissolved in 130mL deionized water and 20mL hydrochloric acid (37%, HCl) mixed solution; 8.5g tetraethyl orthosilicate (TEOS) was added dropwise in a water bath at 35-40°C; after stirring for 24 hours, at 100-130°C Keep the temperature constant for 2-3 days; filter, wash, and dry, heat at 550°C for 5 hours, and cool to room temperature to obtain the SBA-15 template.

[0032] 2) Preparation of mesoporous cobalt tetroxide (Co 3 o 4 )

[0033] Dissolve 1-4g of cobalt nitrate in 20-30mL of deionized water or ethanol, add 1g of SBA-15 template at room temperature; stir until the solvent evaporates, heat the solid mixture at 300-500°C for 3-5 hours, and cool to room temperature The mixture is added to 1~3mol / L sodium hydroxide (NaOH) solution or 5wt% hydrofluoric acid (HF), stirred for 2~6 hours; after centrifugation, washing and drying, the mesoporous tric...

Embodiment 2

[0042] 1) Preparation of Mesoporous Silica KIT-6 Template

[0043] Dissolve 3.0g of triblock copolymer P123 in 115mL of deionized water and 5mL of hydrochloric acid (37%, HCl) mixture; add 3.0g of butanol dropwise in a water bath at 35-40°C, react for 1 hour, and add dropwise 6.45g Orthoethyl silicate (TEOS); after stirring for 24 hours, keep the temperature at 100-130°C for 2-3 days; filter, wash, and dry, heat at 550°C for 5 hours, and cool to room temperature to obtain the KIT-6 template .

[0044] 2) Preparation of mesoporous manganese dioxide (MnO 2 )

[0045] Dissolve 5-6g of manganese nitrate in 20-30mL of deionized water to make a saturated solution, add 1g of KIT-6 template into 20-30mL of n-hexane to make a suspension; add the saturated solution of manganese nitrate dropwise to the In the suspension, stir overnight, filter and dry to obtain a solid mixture; heat the mixture at 400-500°C for 3-5 hours, and cool to room temperature; add the mixture to 1-3mol / L sodiu...

Embodiment 3

[0052] 1) Preparation of mesoporous silica SBA-16 template

[0053] 2.0g triblock copolymer P127 (EO 106 PO 70 EO 106 ), 4.0g of potassium chloride (KCl) were dissolved in 100mL of deionized water and 20mL of hydrochloric acid (37%, HCl) mixed solution; 8.6g of tetraethyl orthosilicate (TEOS) was added dropwise in a water bath at 35-40°C; stirred After 24 hours, keep the temperature at 100-130°C for 2-3 days; filter, wash, and dry, heat at 550°C for 5 hours, and cool to room temperature to obtain the SBA-16 template.

[0054] 2) Preparation of mesoporous tin dioxide (SnO 2 )

[0055] Grind and mix 1-4g stannous chloride or tin chloride with 1g SBA-16 template for 1-2 hours; heat the mixture at 400-700°C for 3-5 hours and cool to room temperature; add the mixture to 1-3mol / L of sodium hydroxide (NaOH) solution, stirred for 2 to 6 hours; after centrifugation, washing, and drying, the mesoporous tin dioxide (SnO 2 ).

[0056] 3) Preparation of graphene oxide

[0057] Ado...

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Abstract

The invention relates to a graphene-coated mesoporous metallic oxide, and a preparation method and use thereof. The preparation method for the graphene-coated mesoporous metallic oxide comprises the following steps of: 1) synthesizing mesoporous metallic oxides with different pore passage structures by taking mesoporous silicon dioxides with the different pore passage structures as templates; 2) preparing a graphene oxide by using an oxidation method; 3) absorbing mesoporous metallic oxide particles on the surface of the graphene oxide by using a heterocoagulation method; 4) reducing the graphene oxide into graphene by adding a reducing agent; and 5) performing centrifugal separation, washing and drying. The graphene-coated mesoporous metallic oxide provided by the invention has high electrochemical properties, and can be used as an electrode material of a lithium battery.

Description

technical field [0001] The invention relates to the field of nanocomposite materials and electrode materials, in particular to a graphene-coated mesoporous structure metal oxide and its preparation method and application. Background technique [0002] Lithium-ion batteries are widely used in people's daily life due to their high storage energy density, large capacity, no memory effect, high rated voltage, low self-discharge rate, light weight, long service life, high and low temperature adaptability, and environmental protection. In daily life, especially many digital devices use lithium-ion batteries as power sources. Some metal oxides can be used as lithium-ion battery materials due to their high theoretical capacity, such as Co 3 o 4 The theoretical specific capacity is 890mA·h / g. But Co 3 o 4 It has poor conductivity and low charge and discharge rate. Since it stores and releases lithium ions through oxidation and reduction, its cycle performance is poor, which affe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/50H01M4/52
CPCY02E60/12Y02E60/10
Inventor 岳文博
Owner BEIJING NORMAL UNIVERSITY
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