Alpha-Fe2O3 multilayer hollow nanometer spherical structure, preparation method and application

A nanostructure, spherical structure technology, applied in nanotechnology, nanotechnology, structural parts, etc., can solve the problems of restricting and destroying the structure of active materials, poor cycle stability, etc.

Inactive Publication Date: 2016-04-20
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, similar to other transition metal oxides, the volume effect and inherent kinetic factors of iron oxide electrode materials lead to poor cycle stability and rate performance, which restricts its practical application.
In the process of intercalating or releasing lithium ions, the shrinkage or expansion of the active electrode material causes the crushing of the electrode material, destroys the structure of the active material, and limits the contact of electrons with the current collector, so that the battery can be rapidly charged in a short time. The cut-off voltage is reached, resulting in a rapid decline in specific capacity and poor cycle stability

Method used

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  • Alpha-Fe2O3 multilayer hollow nanometer spherical structure, preparation method and application
  • Alpha-Fe2O3 multilayer hollow nanometer spherical structure, preparation method and application
  • Alpha-Fe2O3 multilayer hollow nanometer spherical structure, preparation method and application

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Effect test

Embodiment 1

[0022] 0.16gFeCl 3 ·6H 2 O was dissolved in a mixed solution of 2 mL of water and 18 mL of ethanol, 0.1 g of glycine was added, and then the above mixture was transferred to a hydrothermal kettle and heated at 160 °C for 12 h. After naturally cooling to room temperature, the red powder collected by centrifugation is the product, and the obtained product is multilayer α-Fe 2 o 3 Hollow nanostructures.

Embodiment 2

[0024] 0.16gFe(NO 3 ) 3 ·6H 2 O was dissolved in a mixed solution of 2 mL of water and 18 mL of ethanol, 0.1 g of glycine was added, and then the above mixture was transferred to a hydrothermal kettle and heated at 160 °C for 12 h. After naturally cooling to room temperature, the red powder collected by centrifugation is the product, and the obtained product is multilayer α-Fe 2 o 3 Hollow nanostructures.

Embodiment 3

[0026] 0.16gFeCl 3 ·6H 2 O was dissolved in a mixed solution of 10 mL of water and 10 mL of ethanol, 0.1 g of glycine was added, and then the above mixture was transferred to a hydrothermal kettle and heated at 160 °C for 12 h. After naturally cooling to room temperature, the red powder collected by centrifugation is the product, and the obtained product is multilayer α-Fe 2 o 3 Hollow nanostructures.

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Abstract

The invention discloses an alpha-Fe2O3 multilayer hollow nanometer spherical structure, a preparation method and application and relates to alpha-Fe2O3 hollow nanometer structures, in particular to a alpha-Fe2O3 hollow nanometer spherical structure formed by assembling alpha-Fe2O3 nanometer aggregates. The diameter of the alpha-Fe2O3 multilayer hollow nanometer spherical structure is between 900 nanometers and 5 micrometers, the wall thickness is between 100 nanometers and 500 nanometers, and the number of layers is two or more. Each alpha-Fe2O3 aggregate is a cambiform assembly formed by aggregating alpha-Fe2O3 nanometer particles, wherein the diameter of the aggregate is between 50 nanometers and 200 nanometers, and the length is between 200 nanometers and 500 nanometers. According to the preparation method of the alpha-Fe2O3 hollow nanometer structure, ferric salt and glycine are mixed for a reaction for 6-12 hours on an ethanol-hydrothermal condition at the temperature of 120-200 DEG C. The alpha-Fe2O3 hollow nanometer structure can be used as an electrode material of a lithium ion battery, displays excellent lithium ion battery properties and very good rate capability, and has ultrahigh specific discharge capacity and good cycling stability.

Description

technical field [0001] α-Fe of the present invention 2 o 3 Multilayer hollow nano-spherical structure, preparation method and application involving α-Fe 2 o 3 Hollow nanostructures, especially involving α-Fe 2 o 3 A multilayer hollow spherical structure assembled from nano-aggregates, its preparation method and its application on lithium-ion battery electrodes. Background technique [0002] Currently, rechargeable lithium-ion batteries (LIBs) are not only the main energy sources for portable electronic devices, but also the best choice for powering electric or hybrid electric vehicles. Finding a safe lithium-ion battery electrode material with high electrode potential and high discharge specific capacity is the key factor to realize the application of lithium-ion batteries in electric vehicles. Compared with other transition metal oxides, iron oxide is not only easy to prepare, not harmful to the environment, but also has a higher theoretical specific capacity (800-100...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06H01M4/52H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G49/06C01P2002/72C01P2004/03C01P2004/04C01P2004/61C01P2004/62C01P2004/64H01M4/52H01M10/0525H01M2004/021Y02E60/10
Inventor 陆轻铱高峰党丽赟马海凤徐加应金盈
Owner NANJING UNIV
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