CN108807882B - Fe with porous octahedral structure2O3/Fe3O4Preparation method of @ C/G composite material - Google Patents

Fe with porous octahedral structure2O3/Fe3O4Preparation method of @ C/G composite material Download PDF

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CN108807882B
CN108807882B CN201810504416.5A CN201810504416A CN108807882B CN 108807882 B CN108807882 B CN 108807882B CN 201810504416 A CN201810504416 A CN 201810504416A CN 108807882 B CN108807882 B CN 108807882B
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composite material
mof
graphene
graphene oxide
porous
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CN108807882A (en
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宋永海
汪莉
李燕飞
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Jiangxi Normal University
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
    • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention discloses a method for preparing Fe with a porous octahedral structure by using Triethylamine (TEA) for combustion2O3/Fe3O4@carbon/graphene(Fe2O3/Fe3O4@ C/G) composite material. Taking a metal organic framework (Fe-MOF) as a precursor, uniformly loading the precursor on graphene oxide, then igniting the graphene oxide by using TEA, and taking the Fe-MOF as a self-sacrificial template to generate Fe2O3/Fe3O4Nanoparticles, and reduction of graphene oxide to graphene, to obtain Fe2O3/Fe3O4@ C/G composite material. The method is different from the method for preparing the metal oxide and graphene composite material by a tubular atmosphere furnace calcination mode which is conventionally reported. Fe prepared by the method2O3/Fe3O4The @ C/G composite material has a porous octahedral structure, the preparation process of the method is simple and quick, energy and time are saved, and the prepared porous Fe2O3/Fe3O4The @ C/G composite material has high porosity and good conductivity, and has the advantage of good performance when being used as a negative electrode material of a lithium ion battery.

Description

Fe with porous octahedral structure2O3/Fe3O4Preparation method of @ C/G composite material
Technical Field
The invention relates toAnd a method for preparing Fe with porous octahedral structure2O3/Fe3O4A method of @ C/G composite material, belonging to the field of material chemistry.
Background
Transition metal oxides are widely used as negative electrode materials for lithium ion batteries due to their high theoretical capacity. However, it suffers from large volume expansion and low conductivity during charge and discharge, limiting its application.
Disclosure of Invention
In order to solve the problem that the capacity of the traditional metal oxide serving as a lithium ion battery cathode material is too fast to decay, the invention aims to provide a preparation method of a metal oxide composite material with a porous octahedral structure formed on the basis of a metal organic framework.
The technical scheme for realizing the invention is as follows:
the invention adopts a unique triethylamine combustion method to prepare Fe with a porous octahedral structure on the basis of taking a metal organic framework material Fe-MOF uniformly loaded with graphene oxide as a precursor2O3/Fe3O4@ C/G composite material.
Fe2O3/Fe3O4The preparation method of the @ C/G composite material comprises the following steps:
(1) preparing Graphene Oxide (GO) by an improved Hummers method, putting the prepared graphene oxide in N, N Dimethylformamide (DMF), and performing ultrasonic treatment for a period of time;
(2) adding ferric chloride hexahydrate into the solution, stirring for dissolving, adding terephthalic acid, stirring, and reacting for 3-5 hours at the temperature of 110-130 ℃; cooling to room temperature, washing with N, N dimethylformamide and three times of water in sequence, and drying in vacuum to obtain precursor Fe-MOF/GO;
(3) adding Triethylamine (TEA) into the Fe-MOF/GO, igniting, completely burning, drying, and finally obtaining Fe2O3/Fe3O4@ C/G composite material.
Preferably, in the step (1), the time for ultrasonic treatment is 30 min.
Preferably, in step (3), the drying is carried out at a temperature of 60 ℃.
By the above treatment mode, Fe with porous octahedral structure is successfully prepared2O3/Fe3O4The @ C/G composite material has octahedron size of about 800nm, is in porous form and has relatively large porosity.
The invention has the technical effects that: compared with the reported method for synthesizing the graphene-based composite material, the method has the advantages of simple synthesis method, capability of realizing rapid synthesis, and time and energy conservation. Prepared Fe having porous octahedral structure2O3/Fe3O4The @ C/G composite material has the advantages of large porosity and large specific surface, and has good performance when being used as a negative electrode material of a lithium ion battery. The method has guiding significance for the synthesis method for preparing the metal oxide material based on the MOF, develops a new field for the development of high-performance lithium ion batteries, and has important significance.
Drawings
FIG. 1 is Fe with porous octahedral structure2O3/Fe3O4Scanning electron microscopy of the @ C/G composite.
FIG. 2 shows Fe having a porous octahedral structure2O3/Fe3O4X-ray diffraction pattern of @ C/G composite.
Detailed Description
Example 1
Graphene Oxide (GO) is prepared by an improved Hummers method, and the prepared graphene oxide (10mg) is placed in 15 mL of N, N-Dimethylformamide (DMF) and subjected to ultrasonic treatment for 30 min. Adding 0.08g of ferric chloride hexahydrate into the solution, stirring to dissolve the ferric chloride, adding 0.05g of terephthalic acid, stirring for one hour, transferring the terephthalic acid into a 50mL flask, and carrying out oil bath at 110 ℃ for 3 hours; and cooling to room temperature, washing with DMF (dimethyl formamide) and water for three times in sequence, and putting into a freeze dryer for vacuum drying to obtain the precursor Fe-MOF/GO. Putting 25mg of Fe-MOF/GO into a watch glass, adding 0.5mL of TEA, igniting, putting into an oven after the TEA is completely combustedDrying at 60 ℃ to finally obtain Fe2O3/Fe3O4@ C/G composite material.
Example 2
Graphene Oxide (GO) is prepared by an improved Hummers method, and the prepared graphene oxide (15mg) is placed in 15 mL of N, N-Dimethylformamide (DMF) and subjected to ultrasonic treatment for 30 min. Adding 0.15g of ferric chloride hexahydrate into the solution, stirring to dissolve the ferric chloride, adding 0.1g of terephthalic acid, stirring for one hour, transferring the terephthalic acid into a 50mL flask, and carrying out oil bath at 120 ℃ for 4 hours; and cooling to room temperature, washing with DMF (dimethyl formamide) and water for three times in sequence, and putting into a freeze dryer for vacuum drying to obtain the precursor Fe-MOF/GO. Putting 25mg of Fe-MOF/GO into a watch glass, adding 1.0mL of TEA, igniting, putting into an oven after the TEA is completely combusted, drying at 60 ℃, and finally obtaining Fe2O3/Fe3O4@ C/G composite material.
Example 3
Graphene Oxide (GO) is prepared by an improved Hummers method, and the prepared graphene oxide (15mg) is placed in 15 mL of N, N-Dimethylformamide (DMF) and subjected to ultrasonic treatment for 30 min. Adding 0.3g of ferric chloride hexahydrate into the solution, stirring to dissolve the ferric chloride, adding 0.2g of terephthalic acid, stirring for one hour, transferring the solution into a 50mL flask, and carrying out oil bath at 130 ℃ for 4 hours; and cooling to room temperature, washing with DMF (dimethyl formamide) and water for three times in sequence, and putting into a freeze dryer for vacuum drying to obtain the precursor Fe-MOF/GO. Putting 25mg of Fe-MOF/GO into a watch glass, adding 1.5mL of TEA, igniting, putting into an oven after the TEA is completely combusted, drying at 60 ℃, and finally obtaining Fe2O3/Fe3O4@ C/G composite material.
Example 4
Graphene Oxide (GO) was prepared by modified Hummers, and the prepared graphene oxide (20mg) was placed in 15 mL of N, N Dimethylformamide (DMF) and sonicated for 30 min. Adding 0.3g of ferric chloride hexahydrate into the solution, stirring to dissolve the ferric chloride, adding 0.2g of terephthalic acid, stirring for one hour, transferring the terephthalic acid into a 50mL flask, and carrying out oil bath at 125 ℃ for 5 hours; and cooling to room temperature, washing with DMF (dimethyl formamide) and water for three times in sequence, and putting into a freeze dryer for vacuum drying to obtain the precursor Fe-MOF/GO. 25mg of Fe-MOF are takenAdding 2.0mL of TEA into GO in a watch glass, igniting, putting into an oven after completely burning, drying at 60 ℃ to finally obtain Fe2O3/Fe3O4@ C/G composite material.
In conclusion, by adopting the unique triethylamine combustion method, the precursor can be converted into the metal oxide, and the graphene oxide can be reduced, so that the porous composite material with the octahedral structure and uniform distribution can be obtained on the surface of the graphene. The method is different from the prior art in that Fe-MOF/GO precursor is directly prepared by a one-pot method and then is combusted by triethylamine, and the method is different from the traditional calcining method of a tubular atmosphere furnace, so that Fe with a porous structure is quickly and simply prepared2O3/Fe3O4@ C/G composite material. As a negative electrode material of a lithium ion battery, the capacity of the lithium ion battery still has 1209.7mAh g-1And has excellent cycle stability.
Transition metal oxides prepared based on metal organic framework materials have the advantages of large porosity, more active sites, self-supporting structures and the like, and are widely applied. Graphene has a large specific surface and good electrical conductivity, and thus is often used as an excellent substrate material. Therefore, when the metal organic framework is loaded on the graphene and is burnt by unique triethylamine, iron oxide is generated and the conductivity of the graphene is increased, and the formed porous octahedron is uniformly loaded on the graphene, so that the mutually connected conductive framework is provided, the transmission rate of electrons can be improved, the volume expansion of the oxide can be relieved, and the charge and discharge cycle stability of the lithium ion battery can be maintained.

Claims (5)

1. Fe2O3/Fe3O4The preparation method of the @ C/G composite material comprises the following steps:
(1) preparing graphene oxide by an improved Hummers method, placing the prepared graphene oxide in N, N dimethylformamide, and carrying out ultrasonic treatment for a period of time;
(2) adding ferric chloride hexahydrate into the solution, stirring for dissolving, adding terephthalic acid, stirring, and carrying out oil bath reaction for 3-5 hours at the temperature of 110-130 ℃; cooling to room temperature, washing with N, N-dimethylformamide and three times of water in sequence, and drying in vacuum to obtain a precursor Fe-MOF/GO;
(3) adding triethylamine into the Fe-MOF/GO, igniting, completely burning, drying, and finally obtaining Fe with a porous octahedral structure2O3/Fe3O4@ C/G composite material.
2. The method of claim 1, wherein: in the step (1), the ultrasonic treatment time is 30 min.
3. The method of claim 1, wherein: in step (3), the drying is carried out at a temperature of 60 ℃.
4. Fe obtained by the method according to any one of claims 1 to 32O3/Fe3O4@ C/G composite material.
5. Fe of claim 42O3/Fe3O4The application of the @ C/G composite material in the lithium ion battery.
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CN109573988B (en) * 2018-12-14 2022-04-29 东华大学 Graphene composite aerogel wave-absorbing material and preparation method and application thereof
CN109806912B (en) * 2019-03-11 2021-05-14 山西大学 Neodymium complex/GO/Fe capable of being magnetically recycled3O4Ternary complex and preparation method and application thereof
CN109935818B (en) * 2019-03-28 2021-07-06 中南大学 Ferroferric oxide/rGO nano anode material and preparation method thereof
CN110012656B (en) * 2019-05-05 2020-10-27 安徽理工大学 Preparation method of nano composite wave-absorbing material
CN115849996B (en) * 2023-01-10 2024-01-26 延安大学 Potassium-doped maghemite coupled graphene composite combustion catalyst and preparation method and application thereof

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