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A fe with a porous octahedral structure 2 o 3 /fe 3 o 4 Preparation method of @c/g composite material
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A composite material, fe2o3 technology, applied in the field of material chemistry, to achieve the effects of large porosity, saving time and energy, and simple synthesis method
Active Publication Date: 2022-04-26
JIANGXI NORMAL UNIV
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[0003] In order to solve the problem of too fast capacity decay when traditional metal oxides are used as negative electrode materials for lithium-ion batteries, the purpose of the present invention is to provide a method for preparing a porous octahedral metal oxide composite material based on a metal-organic framework.
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Embodiment 1
[0017]Graphene oxide (GO) was prepared by the improved Hummers method, and the prepared graphene oxide (10mg) was placed in 15 mL N, N dimethylformamide (DMF) and sonicated for 30min. In the above solution, 0.08g of ferric chloride hexahydrate was added, stirred to dissolve, and then 0.05g of terephthalic acid was added, stirred for an hour and then transferred to a 50mL flask, 110 °C oil bath for 3h; after cooling to room temperature, washed with DMF, three times of water, put into a freeze dryer vacuum drying, to obtain the precursor Fe-MOF / GO. Take 25mg Fe-MOF / GO in a surface dish, add 0.5mL TEA, ignite, wait for it to burn completely, put it into an oven, dry at 60 °C, and finally obtain Fe 2 O 3 / Fe 3 O 4 @C / G composites.
Embodiment 2
[0019] Graphene oxide (GO) was prepared by improved Hummers method, and the prepared graphene oxide (15mg) was placed in 15 mL N, N dimethylformamide (DMF) and sonicated for 30 min. In the above solution, 0.15g of ferric chloride hexahydrate was added, stirred to dissolve, and then 0.1g of terephthalic acid was added, stirred for an hour and then transferred to a 50mL flask, 120 °C oil bath for 4h; after cooling to room temperature, washed with DMF, three times water, put into a freeze dryer vacuum drying, to obtain the precursor Fe-MOF / GO. Take 25mg Fe-MOF / GO in a surface dish, add 1.0mL TEA, ignite, wait for it to burn completely, put it into an oven, dry at 60 °C, and finally obtain Fe 2 O 3 / Fe 3 O 4 @C / G composites.
Embodiment 3
[0021] Graphene oxide (GO) was prepared by improved Hummers method, and the prepared graphene oxide (15mg) was placed in 15 mL N, N dimethylformamide (DMF) and sonicated for 30 min. In the above solution, 0.3g of ferric chloride hexahydrate was added, stirred to dissolve, and then 0.2g of terephthalic acid was added, stirred for an hour and then transferred to a 50mL flask, 130 °C oil bath for 4h; after cooling to room temperature, washed with DMF, three times of water, put into a freeze dryer vacuum drying, to obtain the precursor Fe-MOF / GO. Take 25mg Fe-MOF / GO in a surface dish, add 1.5mL TEA, ignite, wait for it to burn completely, put it into an oven, dry at 60 °C, and finally obtain Fe2 O 3 / Fe 3 O 4 @C / G composites.
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Abstract
The invention discloses a method for preparing Fe with a porous octahedral structure by burning triethylamine (TEA) 2 o 3 / Fe 3 o 4 @carbon / graphene (Fe 2 o 3 / Fe 3 o 4 @C / G) Composite material. Using a metal-organic framework (Fe‑MOF) as a precursor, it is uniformly supported on graphene oxide, and then ignited with TEA, and Fe‑MOF is used as a self-sacrificial template to generate Fe 2 o 3 / Fe 3 o 4 nanoparticles, while graphene oxide is reduced to graphene, resulting in Fe 2 o 3 / Fe 3 o 4 @C / G Composite. This method is different from the conventionally reported method of preparing metal oxide and graphene composite materials by calcination in a tube atmosphere furnace. Fe produced by this method 2 o 3 / Fe 3 o 4 The @C / G composite material has a porous octahedral structure, and the preparation process of this method is simple and fast, which is conducive to saving energy and time. The prepared porous Fe 2 o 3 / Fe 3 o 4 The @C / G composite material has a large porosity and good electrical conductivity, and it shows good performance advantages as an anode material for lithium-ion batteries.
Description
Technical field [0001] The present invention relates to a preparation of Fe having a porous octahedral structure 2 O 3 / Fe 3 O 4 @C / G composites belong to the field of materials chemistry. Background [0002] Transition metal oxides are widely used as anode materials for lithium-ion batteries due to their high theoretical capacity. However, its application is limited by large volume expansion and low conductivity during charge and discharge. Contents of the Invention [0003] In order to solve the problem of capacity decaying too quickly when conventional metal oxides are used as anode materials for lithium-ion batteries, the object of the present invention is to provide a method for preparing a metal oxide composite material based on a porous octahedral structure formed by a metal-organic framework. [0004] Implementing the technical solution of the present invention: [0005] The present invention employs Fe having a porous octahedral structure prepared by a unique triethyla...
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