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Preparation method of monodisperse Alpha-iron oxide nanosheet

An iron oxide nano, monodisperse technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as poor cycle performance, and achieve low cost, excellent cycle performance, and high purity. Effect

Inactive Publication Date: 2017-07-28
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

α-Fe 2 o 3 Because of its special redox mechanism, it has a theoretical capacity of up to 1007mAh / g as an anode material for lithium-ion batteries, but its cycle performance as an electrode material is poor. In order to improve α-Fe 2 o 3 Cycling performance as anode material for lithium-ion batteries

Method used

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  • Preparation method of monodisperse Alpha-iron oxide nanosheet
  • Preparation method of monodisperse Alpha-iron oxide nanosheet
  • Preparation method of monodisperse Alpha-iron oxide nanosheet

Examples

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Embodiment 1

[0036] 1) Dissolve 1g of P123 in 30ml of ethylene glycol, and stir at room temperature for 24 hours to form a clear solution; take 0.015mol of ferric nitrate nonahydrate and dissolve it in the above-mentioned P123 ethylene glycol solution;

[0037] 2) Dissolve 0.04mol KOH in 10ml of deionized water at the same time, stir well to form a clear solution;

[0038] 3) Slowly add the above KOH aqueous solution dropwise into the ethylene glycol solution of P123 to form a reddish-brown precursor solution, transfer the precursor solution to a 50ml polytetrafluoroethylene reactor for 200°C, 30h hydrothermal reaction, put The hydrothermal reaction product is filtered, washed, and dried to obtain monodisperse α-iron oxide nanosheets.

[0039] Carry out XRD characterization to the monodisperse α-iron oxide nanoplate of embodiment 1 gained, as figure 1 As shown, the X-ray diffraction test shows that the product is a pure phase, and there is no heterophase Fe 3 o 4 , confirming that the p...

Embodiment 2

[0042] 1) Dissolve 1g of P123 in 20ml of ethylene glycol, and stir for 20 hours at room temperature to form a clear solution; take 0.02mol of ferric nitrate nonahydrate and dissolve it in P123 ethylene glycol solution;

[0043] 2) Dissolve 0.035mol KOH in 10ml of deionized water at the same time, stir well to form a clear solution;

[0044] 3) Slowly add the above KOH aqueous solution dropwise into the ethylene glycol solution of P123 to form a reddish-brown precursor solution, transfer the precursor solution to a 50ml polytetrafluoroethylene reactor for 200°C, 24h hydrothermal reaction, and water The thermal reaction product is filtered, washed, and dried to obtain monodisperse α-iron oxide nanosheets.

Embodiment 3

[0046] 1) Dissolve 2g of P123 in 25ml of ethylene glycol, and stir for 30 hours at room temperature to form a clear solution; take 0.02mol of ferric nitrate nonahydrate and dissolve it in P123 ethylene glycol solution;

[0047] 2) Dissolve 0.06mol KOH in 10ml of deionized water at the same time, stir well to form a clear solution;

[0048] 3) Slowly add the above KOH aqueous solution dropwise into the ethylene glycol solution of P123 to form a reddish-brown precursor solution, transfer the precursor solution to a 50ml polytetrafluoroethylene reactor for 200°C, 24h hydrothermal reaction, and water The thermal reaction product is filtered, washed, and dried to obtain monodisperse α-iron oxide nanosheets.

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Abstract

The invention relates to a preparation method of a monodisperse Alpha-iron oxide nanosheet, comprising the steps of 1) dissolving P123 in ethylene glycol, stirring, and continuing to dissolve iron nitrate in the ethylene glycol to obtain clarified solution, wherein the molar concentration of the iron nitrate in the clarified solution is 0.5-2 mol / L; 2) adding KOH solution into the clarified solution of step 1) to obtain reddish brown precursor solution; 3) hydrothermally reacting the precursor solution of step 2) at the temperature of 180-200 DEG C for 24-30 h to obtain the monodisperse Alpha-iron oxide nanosheet. The preparation method has a simple technical process, is easy to control, free of environmental pollution and low in cost and facilitates large-scale production; the obtained monodisperse Alpha-iron oxide nanosheet has excellent cycle performance as a lithium-ion battery anode material.

Description

technical field [0001] The invention relates to the field of synthesis of inorganic materials, in particular to a method for preparing monodisperse α-iron oxide nanosheets. Background technique [0002] The situation of environmental pollution and energy crisis is becoming increasingly severe, forcing human beings to change the traditional energy consumption structure dominated by fossil fuels, and at the same time actively seek renewable energy as an alternative to fossil energy. However, compared with traditional fossil energy, new types of renewable energy, such as solar energy, wind energy, tidal energy, geothermal energy, etc., are severely constrained by the uncontrollability and inconsistency of the environment. Therefore, realizing effective energy storage and convenient transportation transfer batteries, as an electrochemical system that can efficiently convert electrical energy into easy-to-carry chemical energy, has gradually entered the research vision of scienti...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/525H01M10/0525Y02E60/10
Inventor 徐刚孙小磊杨永荣沈鸽韩高荣
Owner ZHEJIANG UNIV
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