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One-step preparation method of core-shell structure nano-α-fe2o3@c composite material

A composite material and shell structure technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of irregular particle morphology, complicated experimental operation, long preparation cycle, etc., achieving simple operation, short preparation process cycle, The effect of easy mass production

Active Publication Date: 2020-06-26
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] After the existing nano-α-Fe 2 o 3 The literature search of @C composite materials preparation technology found that Fang et al. published "Two Morphology Nano α-Fe 2 o 3 The preparation and adsorption performance of @C” mentioned in the article that α-Fe with two morphologies of litchi shape and diamond shape was prepared by using step-by-step hydrothermal and hydrogen peroxide oxidation assisted pH adjustment. 2 o 3 @C Nanomaterials with core-shell structure, but the α-Fe prepared by this method 2 o 3 @C The particle size is more than a few microns, and the preparation cycle is long, and the experimental operation is complicated
[0004] In addition, "Preparation of Nano-Fe by Solution Combustion Method" published by Li Weiyu et al. 2 o 3 / C Supercapacitor Electrode Materials” mentions that in the air atmosphere, using ferric nitrate, citric acid and ammonium nitrate as raw materials, one-step synthesis of nano-Fe by solution combustion method 2 o 3 / C composite material preparation method, the preparation method has basically realized the advantages of simple preparation process, high yield and low cost, but the prepared Fe 2 o 3 / C Material particles have irregular morphology and serious agglomeration

Method used

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  • One-step preparation method of core-shell structure nano-α-fe2o3@c composite material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0018] Example 1, one-step preparation of core-shell structure nano-α-Fe 2 o 3 A method for @C composite materials, including the following steps:

[0019] 1) Weigh 3g FeCl 3 ·6H 2 O in a beaker, add 30ml of water, stir until completely dissolved, and prepare a 0.1g / mL iron salt solution;

[0020] 2) Weigh 5g of medical absorbent cotton, fill it in a quartz crucible, pour the iron salt solution prepared in step 1) into the quartz crucible, and squeeze the absorbent cotton with a glass rod, so that all the absorbent cotton is fully soaked;

[0021] 3) Put the quartz crucible into a tube furnace, feed nitrogen gas, heat up to 350°C at a rate of 5°C / min, keep warm for 2 hours, cool the furnace to room temperature naturally, and turn off the nitrogen gas; after removing the remaining cotton wool, a powdery product is obtained, core-shell structure nano-α-Fe 2 o 3 @C Composite.

[0022] With reference to Fig. 1, Fig. 1 (a) is the core-shell structure nano-α-Fe that embodimen...

Embodiment 2

[0024] Example two, one-step preparation of core-shell structure nano-α-Fe 2 o 3 A method for @C composite materials, including the following steps:

[0025] 1) Weigh 1.5g FeCl 3 ·6H 2 O in a beaker, add 30ml of water, stir until completely dissolved, and prepare a 0.05g / mL iron salt solution;

[0026] 2) Weigh 5g of medical absorbent cotton, fill it in a quartz crucible, pour the iron salt solution configured in step 1 into the quartz crucible, and squeeze the absorbent cotton with a glass rod to fully soak all the absorbent cotton;

[0027] 3) Put the quartz crucible into the tube furnace, feed in nitrogen, raise the temperature to 280°C at a rate of 5°C / min, keep it warm for 1 hour, cool the furnace to room temperature naturally, and turn off the nitrogen; remove the remaining cotton wool to obtain a powdery product, core-shell structure nano-α-Fe 2 o 3 @C Composite.

Embodiment 3

[0028]Embodiment three, a kind of one-step preparation core-shell structure nano-α-Fe 2 o 3 A method for @C composite materials, including the following steps:

[0029] 1) Weigh 6g FeCl 3 ·6H 2 O in a beaker, add 30ml of water, stir until completely dissolved, and prepare a 0.2g / mL iron salt solution;

[0030] 2) Weigh 5g of medical absorbent cotton, fill it in a quartz crucible, pour the iron salt solution prepared in step 1) into the quartz crucible, and squeeze the absorbent cotton with a glass rod, so that all the absorbent cotton is fully soaked;

[0031] 3) Put the quartz crucible into a tube furnace, feed nitrogen gas, heat up to 600°C at a rate of 5°C / min, keep warm for 3 hours, cool the furnace to room temperature naturally, and turn off the nitrogen gas; after removing the remaining cotton wool, a powdery product is obtained, core-shell structure nano-α-Fe 2 o 3 @C Composite.

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Abstract

A one-step preparation method of core-shell-structure nano alpha-Fe2O3@C composite includes: preparing an iron salt solution; filling a quartz crucible with medical absorbent cotton; pouring the ironsalt solution into the quartz crucible; extruding the absorbent cotton with a glass rod so that all absorbent cotton is full wetted; placing the quartz crucible in a tube furnace; introducing nitrogen; heating to 280-600 DEG C; holding the temperature for 1-3 hours, and naturally cooling; removing residual cotton to obtain the core-shell structural nano alpha-Fe2O3@C composite. The method has theadvantages that the core-shell-structure nano alpha-Fe2O3@C composite with complete structure and high dispersibility can be prepared quickly, the whole preparation process has a short cycle and is simple and easy to operate, and the method is easy for large-scale batch production.

Description

technical field [0001] The invention relates to the technical field of preparation of nano-iron-carbon composite materials, in particular to one-step preparation of core-shell structure nano-α-Fe 2 o 3 @C Composite method. Background technique [0002] Seeking a new generation of high specific energy negative electrode materials has been a hot spot in the research of lithium-ion battery electrode materials. Transition metal oxides such as MnO 2 , α-Fe 2 o 3 , Fe 3 o 4 As anode materials for lithium-ion batteries, it has received widespread attention because it can provide a reversible capacity of up to 700mAh / g, and it is a new generation of lithium-ion battery electrode materials with great potential. where α-Fe 2 o 3 As an anode material for lithium-ion batteries, it has attracted widespread attention due to its high theoretical specific capacity of 1007mAh / g, low cost, and environmental friendliness. However, its poor conductivity, low energy efficiency, and easy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 彭年才连崑陈振秋胡飞
Owner XI AN JIAOTONG UNIV
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