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Method for preparing lithium ion battery cathode material coated iron sesquioxide

A technology of ferric oxide and lithium-ion batteries, which can be used in battery electrodes, circuits, electrical components, etc., and can solve problems that have not been reported in the literature.

Inactive Publication Date: 2011-10-05
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fe prepared by hydrothermal method 2 o 3 @C composite material, the particles are uniformly dispersed, the structure of the composite material is stable, and it has excellent comprehensive electrochemical performance, but there is no literature report on this aspect at present

Method used

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  • Method for preparing lithium ion battery cathode material coated iron sesquioxide
  • Method for preparing lithium ion battery cathode material coated iron sesquioxide
  • Method for preparing lithium ion battery cathode material coated iron sesquioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 5 g of ferric chloride hexahydrate and 0.5 g of sucrose were added to 400 ml of deionized water, and ultrasonically oscillated for 0.5 hour to obtain a uniform mixed solution. Put the above mixed solution into a round bottom flask, stir for 30 minutes, and gradually add sodium hydroxide to adjust the pH of the solution to 6. The mixed solution was transferred to the bottom of the hydrothermal reaction tank and reacted at 160° C. for 12 hours. The hydrothermal product is centrifugally cleaned several times with deionized water and absolute ethanol respectively, and after being vacuum freeze-dried, a carbon precursor-coated iron sesquioxide composite material is obtained. The composite was calcined at 600°C under an argon atmosphere for 2 hours and cooled to room temperature to obtain Fe 2 o 3 @C Composite.

[0021] figure 1 a is the Fe obtained in Example 1 2 o 3 XRD patterns of @C composites. From the diffraction peaks in the figure, it can be seen that the compo...

Embodiment 2

[0025] Add 5 g of ferric chloride hexahydrate and 1.0 g of glucose into 500 ml of deionized water, and ultrasonically oscillate for 0.5 hour to obtain a uniform mixed solution. Put the above mixed solution into a round bottom flask, stir for 30 minutes, gradually add ammonia water, and adjust the pH of the solution to 9. The mixed solution was transferred to the bottom of the hydrothermal reaction tank, and reacted at 180° C. for 24 hours. The hydrothermal product is centrifugally cleaned several times with deionized water and absolute ethanol respectively, and after being vacuum freeze-dried, a carbon precursor-coated iron sesquioxide composite material is obtained. The composite was calcined at 800°C under an argon atmosphere for 4 hours and cooled to room temperature to obtain Fe 2 o 3 @C Composite.

[0026] figure 1 b is the Fe obtained in Example 2 2 o 3 XRD patterns of @C composites. From the diffraction peaks in the figure, it can be seen that the composite mainl...

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Abstract

The invention relates to a method for preparing a lithium ion battery cathode material, in particular to a method for preparing a carbon coated iron sesquioxide (Fe2O3@C) composite material. The method comprises the following steps of: uniformly dispersing an iron salt and a carbon source into deionized water to obtain mixed solution; regulating the pH of the solution and hydrolyzing the iron salt; putting the mixed solution into a reaction kettle, performing hydrothermal reaction, and cleaning and freeze-drying the obtained product to obtain a carbon precursor coated iron sesquioxide composite material; and finally, roasting the carbon precursor coated iron sesquioxide composite material under a dynamic protective atmosphere to obtain the black powdery Fe2O3@C composite material. The method has the advantages that: the raw materials are common and easily obtained, so the cost is low; the preparation process is simple, safe and environment-friendly; the prepared Fe2O3@C composite material has excellent comprehensive electrochemical performance; when the composite material is used as a lithium ion battery electrode material, the reversible charge / discharge capacity can reach about 1,500mAh / g; and the composite material has good cycle life.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery negative electrode material, in particular to a lithium ion battery negative electrode material carbon-coated ferric oxide (Fe 2 o 3 The preparation method of @C) belongs to the technical field of new energy material preparation methods. Background technique [0002] Ferric oxide (Fe 2 o 3 ) is a functional material with many uses. It has a theoretical specific capacity of up to 1007mAh / g when it is used as an electrode negative electrode material for lithium-ion batteries. It also has the advantages of low production cost, easy large-scale production, and non-toxic and non-polluting. Therefore, it is regarded as a new generation of lithium-ion battery electrode materials with great potential. However, when this material is used as an electrode material for lithium-ion batteries, the initial Coulombic efficiency is low, the reversible cycle capacity decays quickly, and there is ...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/52
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 吴超田雷雷李佳徐守冬邱祥云庄全超史月丽
Owner CHINA UNIV OF MINING & TECH
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