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Homogenous precipitation method for preparing Fe2O3 nanobelt and Fe2O3 nanobelt-carbon composite material

A technology of carbon composite materials and composite materials, which is applied in the field of uniform precipitation of composite materials, can solve the problems of poor cycle performance and poor rate performance of negative electrode materials, and achieve the effects of low self-discharge rate, high working voltage and low cost

Active Publication Date: 2015-05-13
任原环保科技(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is aimed at current Fe 2 o 3 The disadvantages of poor cycle performance and poor rate performance of negative electrode materials provide a way to prepare Fe 2 o 3 Uniform precipitation method of nanoribbons and their composite materials with carbon

Method used

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  • Homogenous precipitation method for preparing Fe2O3 nanobelt and Fe2O3 nanobelt-carbon composite material
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  • Homogenous precipitation method for preparing Fe2O3 nanobelt and Fe2O3 nanobelt-carbon composite material

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Experimental program
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Effect test

Embodiment 1

[0035] First, take 0.5g FeCl 3 ·6H 2 O and 0.134 g of sodium oxalate were sequentially dissolved in 200 mL of deionized water. Take 0.20 g of ascorbic acid and dissolve it in about 5 mL of deionized water, then add the ascorbic acid aqueous solution dropwise to the stirring solution above, and continue to stir for about 3 hours after the addition is complete. After centrifugal separation, the product was washed three times with deionized water, and then dried in a vacuum oven at 85° C. to obtain a yellow product. The obtained yellow product was placed in a porcelain boat and heat-treated at 700°C for 3 hours in an air atmosphere to obtain the final product Fe 2 o 3 nanobelt.

Embodiment 2

[0037] First, take 25.0 mg of carbon nanotubes (CNTs), add it into 200 mL of deionized water, and stir it ultrasonically for 3 h. Then, take 6.06g Fe(NO 3 ) 3 9H 2 O and 6.6g of ammonium oxalate were sequentially added to the above dispersion of CNTs and stirred to dissolve them. Get 3.52g of sodium hypophosphite and dissolve it in about 10mL of deionized water, then add the aqueous solution of sodium hypophosphite dropwise to the stirring Fe(NO 3 ) 3 , ammonium oxalate and CNTs mixture, continue to stir for about 0.5h after the dropwise addition. After centrifugation, the product was washed three times with ethanol, and then dried in a vacuum oven at 85°C to obtain a black product. The obtained black product was placed in a porcelain boat and heat-treated at 250°C for 3 hours in an air atmosphere to obtain the final product Fe 2 o 3 -CNTs composites.

[0038] figure 1 For the prepared Fe 2 o 3 / Carbon XRD pattern, it can be seen from the figure that the diffraction...

Embodiment 3

[0040] First, take 100 mg of CNTs, add it into 200 mL of deionized water, and disperse for 0.5 h with ultrasonic-assisted stirring. Then, take 0.5g FeCl respectively 3 ·6H 2 O and 0.134g of sodium oxalate were sequentially added to the above CNTs dispersion and stirred to dissolve it. Dissolve 0.20 g of ascorbic acid in about 5 mL of deionized water, then add the aqueous solution of ascorbic acid dropwise to the stirring FeCl 3 , sodium oxalate and CNTs mixture, after the dropwise addition, continue to stir and react for about 3h. After centrifugation, the product was washed three times with ethanol, and then dried in a vacuum oven at 85°C to obtain a black product. The obtained black product was placed in a porcelain boat, heat-treated at 300°C for 0.5h in an air atmosphere, and then heat-treated at 700°C for 3h under an argon or nitrogen atmosphere to obtain the final product Fe 2 o 3-CNTs composites.

[0041] figure 2 For the prepared Fe 2 o 3 TEM image of nanobel...

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Abstract

A homogenous precipitation method for preparing a Fe2O3 nanobelt and a Fe2O3 nanobelt-carbon composite material comprises the following steps: reacting a complexing agent C2O4<2-> with Fe<3+> in a solution to generate a soluble [Fe(C2O4)3]<3+> complex, reducing Fe (III) to Fe (II) by using a reducing agent, and reacting Fe (II) with C2O4<2-> in the above solution to generate a FeC2O4 precipitate or to generate the FeC2O4 precipitate homogenously precipitated on a carbon material in order to obtain FeC2O4 or a FeC2O4 / carbon composite material precursor; and carrying out calcining treatment at a certain temperature to prepare the Fe2O3 nanobelt or the Fe2O3 nanobelt / carbon composite material. The Fe2O3 nanobelt / carbon has excellent electrochemical performances as a lithium ion battery negative material. The carbon material can effectively buffer the volume change of Fe2O3 in the charge and discharge process to improve the cycle stability of the composite material, and also can form an effective conductive network in order to facilitate rapid transfer of electrons and improve the rate performance of the composite material. The above preparation method has the advantages of low device requirements, mild preparation conditions, simple process, short period, low cost, and suitableness for large scale production.

Description

technical field [0001] The invention belongs to the field of new energy materials and electrochemistry, in particular to a method for preparing Fe 2 o 3 Homogeneous precipitation method of nanoribbons and their composites with carbon. Background technique [0002] Lithium-ion battery has the advantages of high working voltage, large specific energy, no memory effect, no pollution, low self-discharge rate and long service life, etc. It is currently the best secondary battery system with comprehensive performance. It has been widely used in portable consumer electronics fields such as mobile phones, notebook computers, and digital cameras, and is gradually expanding to fields such as electric vehicles and energy storage batteries. [0003] Negative electrode material is one of the key components of lithium-ion batteries and a key factor determining the overall performance of lithium-ion batteries. At present, the anode materials in commercial lithium-ion batteries are mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/62H01G11/30B82Y40/00
CPCB82Y40/00H01G11/30H01M4/362H01M4/523H01M4/62H01M10/0525Y02E60/10
Inventor 陈剑武明昊王崇
Owner 任原环保科技(上海)有限公司
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