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Environment-friendly and efficient method for preparing iron sesquioxide/graphene composite material

A technology of ferric oxide and composite materials, which is applied in the field of energy, can solve the problems of large discharge of industrial three wastes, huge volume effect, and obstacles to wide application, and achieve the effects of easy expansion of production, stable product performance, and high production efficiency

Inactive Publication Date: 2012-07-25
BEIJING ZHONGKE MICRO NANO NETWORKING SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the two methods have the disadvantages of complex process, low production efficiency, and large discharge of industrial three wastes.
In general, Fe 2 o 3 Nanomaterials have the advantages of general nanomaterials and the characteristics of large theoretical capacity as lithium storage materials, but their huge volume effect and low conductivity hinder their wide application in lithium-ion secondary battery anode materials

Method used

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  • Environment-friendly and efficient method for preparing iron sesquioxide/graphene composite material
  • Environment-friendly and efficient method for preparing iron sesquioxide/graphene composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Graphene oxide prepared by the Hummers method was dispersed in deionized water at a concentration of 0.4 mg / mL, treated with ultrasonic waves for 10 min, and peeled off to obtain 100 mL of suspension. Then add 0.8mmol of ferrous chloride and 0.5g of urea therein successively, and fully stir and dissolve. The above mixed solution was placed in a three-necked flask, and after passing through pure nitrogen for 10 minutes, it was heated by microwave, condensed and refluxed for 15 minutes. Samples were separated, washed, and dried at 60°C. Treat the dried sample in argon at 300°C for 30 minutes to obtain Fe 2 o 3 / graphene composites.

Embodiment 2

[0026] A suspension of graphene oxide was prepared in the same manner as in Example 1, and then 1.2 mmol of ferrous chloride and 1.2 g of urea were sequentially added thereto, fully stirred and dissolved. The above mixed solution was placed in a three-necked flask, and after passing through pure nitrogen for 10 minutes, it was heated by microwave, condensed and refluxed for 15 minutes. Samples were separated, washed, and dried at 60°C. Treat the dried sample in argon at 340°C for 30 minutes to obtain Fe 2 o 3 / graphene composites.

Embodiment 3

[0028] According to the same method as in Example 1, a graphene oxide suspension with a concentration of 0.6 mg / mL was prepared, ultrasonically treated for 15 min, and then 2.0 mmol of ferrous chloride and 1.2 g of urea were sequentially added thereto, fully stirred and dissolved. The above mixed solution was placed in a three-necked flask, and after passing through pure nitrogen for 10 minutes, it was heated by microwave, condensed and refluxed for 15 minutes. Samples were separated, washed, and dried at 60°C. Treat the dried sample in argon at 350°C for 30 minutes to obtain Fe 2 o 3 / graphene composites.

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Abstract

The invention relates to an environment-friendly and efficient method for preparing an iron sesquioxide / graphene composite material. In the method, cheap and abundant soluble ferrous salt serves as an iron source and reducing agent, graphene oxide is quickly reduced into the graphene by the characteristics of microwave heating, and ferrous is oxidized and converted into iron sesquioxide so as to obtain a sesquioxide / graphene composite material. The environment-friendly and efficient method fully utilizes the characteristics of ferrite, has the advantages of simple and efficient preparation technology, no industrial three-waste pollution and stable product performance and is favorable for producing on a large scale, and a product has a wide application prospect in the cathode material of a lithium-ion secondary battery.

Description

technical field [0001] The invention relates to a high-efficiency and green preparation method of a ferric oxide / graphene composite material used as a negative electrode material of a lithium-ion secondary battery, and belongs to the technical field of energy. Background technique [0002] Due to its excellent comprehensive electrical properties and good safety performance, lithium-ion secondary batteries have been highly valued by researchers and industrial producers, and have developed rapidly in the past 20 years, becoming a hot spot in the research of new power supply technologies in recent years. Normally, lithium-ion secondary batteries are composed of positive electrode materials, negative electrode materials, electrolytes, separators, and battery casings. Electrode materials are the main body of lithium-ion storage and are the key to determining the performance of lithium-ion secondary batteries. Therefore, materials with high theoretical lithium storage capacity and...

Claims

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Application Information

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IPC IPC(8): C01G49/08C01B31/04H01M4/525H01M4/1391C01B32/184
CPCY02E60/122Y02E60/10
Inventor 王太宏张明
Owner BEIJING ZHONGKE MICRO NANO NETWORKING SCI TECH
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